{"id":9021,"date":"2023-04-03T20:24:36","date_gmt":"2023-04-03T16:54:36","guid":{"rendered":"https:\/\/hostida.com\/blog\/?p=9021"},"modified":"2024-11-13T10:39:59","modified_gmt":"2024-11-13T07:09:59","slug":"uncaught-typeerror-cannot-set-property","status":"publish","type":"post","link":"https:\/\/hostida.com\/blog\/uncaught-typeerror-cannot-set-property\/","title":{"rendered":"\u0646\u062d\u0648\u0647 \u0631\u0641\u0639 \u062e\u0637\u0627\u06cc \u00abuncaught typeerror: cannot set property\u00bb \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a"},"content":{"rendered":"<p>\u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u0647 \u060c \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627 \u062e\u0637\u0627\u0647\u0627\u06cc\u06cc \u0645\u0648\u0627\u062c\u0647 \u062e\u0648\u0627\u0647\u06cc\u062f \u0634\u062f.\u0628\u0631\u0627\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0628\u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u06cc\u0646 \u062e\u0637\u0627\u0647\u0627 \u0631\u0627 \u0628\u0631\u0637\u0631\u0641 \u06a9\u0646\u06cc\u062f\u060c \u0628\u0627\u06cc\u062f \u0628\u062a\u0648\u0627\u0646\u06cc\u062f \u067e\u06cc\u0627\u0645 \u062e\u0637\u0627 \u0631\u0627 \u062f\u0631\u06a9 \u06a9\u0646\u06cc\u062f\u060c \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0628\u0647 \u0634\u0645\u0627 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0645\u062a\u0648\u062c\u0647 \u0634\u0648\u06cc\u062f \u06a9\u0647 \u0686\u0631\u0627 \u062e\u0637\u0627 \u0645\u0637\u0631\u062d \u0634\u062f\u0647 \u0627\u0633\u062a \u0648 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0622\u0646 \u0631\u0627 \u0628\u0631\u0637\u0631\u0641 \u06a9\u0646\u06cc\u062f.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0622\u0645\u0648\u0632\u0634\u060c \u0645\u0627 \u062f\u0631 \u0645\u0648\u0631\u062f \u062e\u0637\u0627\u06cc \u201cuncaught typeerror: can set property\u201d \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0635\u062d\u0628\u062a \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f.<\/p>\n<h2>&#8220;Uncaught Typeerror: Cannot Set Property&#8221; \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0647 \u0686\u0647 \u0645\u0639\u0646\u0627\u0633\u062a\u061f<\/h2>\n<p>\u0627\u06cc\u0646 \u062e\u0637\u0627 \u0639\u0645\u062f\u062a\u0627\u064b \u0632\u0645\u0627\u0646\u06cc \u0631\u062e \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u067e\u0631\u0648\u0698\u0647 \u0634\u0645\u0627 \u062d\u0627\u0648\u06cc \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u0646\u0627\u0633\u0627\u0632\u06af\u0627\u0631 \u0628\u0627\u0634\u062f. \u0628\u0631\u062e\u06cc \u0627\u0632 \u062f\u0644\u0627\u06cc\u0644 \u0627\u06cc\u062c\u0627\u062f \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0639\u0628\u0627\u0631\u062a\u0646\u062f \u0627\u0632:<\/p>\n<ul>\n<li>\u0642\u0631\u0627\u0631 \u062f\u0627\u062f\u0646 \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u062f\u0631 \u0645\u0648\u0642\u0639\u06cc\u062a \u0627\u0634\u062a\u0628\u0627\u0647 \u062f\u0631 \u0646\u0634\u0627\u0646\u0647 \u06af\u0630\u0627\u0631\u06cc \u0634\u0645\u0627<\/li>\n<li>\u062e\u0637\u0627\u0647\u0627\u06cc \u0627\u0645\u0644\u0627\u06cc\u06cc \u0647\u0646\u06af\u0627\u0645 \u0627\u0631\u062c\u0627\u0639 \u0628\u0647 \u0639\u0646\u0627\u0635\u0631 DOM<\/li>\n<li>\u062f\u0633\u062a\u0631\u0633\u06cc \u0628\u0647 \u06cc\u06a9 \u0639\u0646\u0635\u0631 DOM \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u06cc\u0627 \u0646\u0627\u0645\u0639\u062a\u0628\u0631<\/li>\n<\/ul>\n<h2>\u0646\u062d\u0648\u0647 \u0631\u0641\u0639 &#8220;uncaught typeerror: cannot set property&#8221; \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a<\/h2>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0628\u062e\u0634\u060c \u0628\u0627 \u0639\u0644\u0644 \u0631\u0627\u06cc\u062c \u062e\u0637\u0627\u06cc \u00ab\u0646\u0648\u0639\u06cc \u062e\u0637\u0627\u06cc \u06a9\u0634\u0641 \u0646\u0634\u062f\u0647: \u0646\u0645\u06cc\u200c\u062a\u0648\u0627\u0646 \u062e\u0635\u0648\u0635\u06cc\u062a \u0631\u0627 \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0631\u062f\u00bb \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0622\u0634\u0646\u0627 \u062e\u0648\u0627\u0647\u06cc\u062f \u0634\u062f. \u0647\u0631 \u0628\u062e\u0634\u060c \u0628\u0647 \u06cc\u06a9\u06cc \u0627\u0632 \u0622\u0646 \u0639\u0644\u0644 \u0648 \u0631\u0627\u0647 \u062d\u0644 \u0622\u0646 \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u0631\u062f.<\/p>\n<h2>\u0642\u0631\u0627\u0631 \u062f\u0627\u062f\u0646 \u0628\u0631\u0686\u0633\u0628 script \u0646\u0627\u0645\u0639\u062a\u0628\u0631<\/h2>\n<p>\u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u06cc\u06a9 \u0635\u0641\u062d\u0647 \u0648\u0628 \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u0645\u06cc \u0634\u0648\u062f\u060c \u06a9\u062f \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0646\u0648\u0634\u062a\u0647 \u0634\u062f\u0647 \u0628\u0631\u0627\u06cc \u0635\u0641\u062d\u0647 \u0646\u06cc\u0632 \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u0645\u06cc \u0634\u0648\u062f. \u0631\u0648\u0634\u06cc \u06a9\u0647 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a Document Object Model (DOM) \u0631\u0627 \u062a\u0634\u062e\u06cc\u0635 \u0645\u06cc\u200c\u062f\u0647\u062f \u0628\u0647 \u062c\u0627\u06cc\u06cc \u06a9\u0647 \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0631\u0627 \u062f\u0631 \u06a9\u062f \u062e\u0648\u062f \u0642\u0631\u0627\u0631 \u0645\u06cc\u200c\u062f\u0647\u06cc\u062f \u0628\u0633\u062a\u06af\u06cc \u062f\u0627\u0631\u062f.<\/p>\n<p>\u0627\u06af\u0631 \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0631\u0627 \u062f\u0631 \u062a\u06af head \u06cc\u0627 \u0628\u0627\u0644\u0627\u062a\u0631 \u0627\u0632 \u0647\u0645\u0647 \u0639\u0646\u0627\u0635\u0631 HTML \u062f\u0631 \u062a\u06af \u0628\u062f\u0646\u0647 \u0642\u0631\u0627\u0631 \u062f\u0647\u06cc\u062f\u060c \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0642\u0628\u0644 \u0627\u0632 \u0622\u0645\u0627\u062f\u0647 \u0634\u062f\u0646 DOM \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<p>\u0648\u0642\u062a\u06cc \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0642\u0628\u0644 \u0627\u0632 \u0622\u0645\u0627\u062f\u0647 \u0634\u062f\u0646 DOM \u0627\u062c\u0631\u0627 \u200c\u0634\u0648\u062f\u060c \u0646\u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f \u0646\u0645\u0627\u06cc\u0634 \u06a9\u0627\u0645\u0644\u06cc \u0627\u0632 DOM \u062f\u0631\u06cc\u0627\u0641\u062a \u06a9\u0646\u062f &#8211; \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u06a9\u0647 \u0628\u06cc\u0634\u062a\u0631 \u0645\u062a\u063a\u06cc\u0631\u0647\u0627\u06cc \u0634\u0645\u0627 \u06a9\u0647 \u0628\u0647 \u0639\u0646\u0627\u0635\u0631 DOM \u067e\u06cc\u0648\u0646\u062f \u0634\u062f\u0647\u200c\u0627\u0646\u062f \u0628\u0647 \u0635\u0648\u0631\u062a null \u0628\u0631\u0645\u06cc\u200c\u06af\u0631\u062f\u0646\u062f. \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644:<\/p>\n<pre class=\"language-html\" tabindex=\"0\"><code class=\"language-html\"><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>Uncaught Typeerror Error Tutorial<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>app.js<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1 <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>heading<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span><\/code><\/pre>\n<p>\u06a9\u062f \u0628\u0627\u0644\u0627 \u062f\u0627\u0631\u0627\u06cc \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u062f\u0631 \u062a\u06af head \u0627\u0633\u062a. \u0645\u0627 \u0647\u0645\u0686\u0646\u06cc\u0646 \u06cc\u06a9 \u0639\u0646\u0635\u0631 h1 \u0628\u0627 \u0634\u0646\u0627\u0633\u0647 \u0639\u0646\u0648\u0627\u0646 \u0647\u0645 \u062f\u0631 \u0627\u06cc\u0646 \u06a9\u062f \u062f\u0627\u0631\u06cc\u0645.<\/p>\n<p>\u062f\u0631 \u0645\u0631\u062d\u0644\u0647 \u0628\u0639\u062f\u060c \u0633\u0639\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u0645\u062a\u0646\u06cc \u0631\u0627 \u0628\u0647 \u0639\u0646\u0635\u0631 h1 \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0647\u06cc\u0645:<\/p>\n<pre class=\"language-js\" tabindex=\"0\"><code class=\"language-js\"><span class=\"token keyword\">let<\/span> heading <span class=\"token operator\">=<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'heading'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\nheading<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">=<\/span> <span class=\"token string\">'This is a heading'<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token comment\">\/\/Uncaught TypeError: Cannot set properties of null (setting 'textContent')<\/span><\/code><\/pre>\n<p>\u0627\u06af\u0631\u0686\u0647 \u06a9\u062f \u0628\u0627\u0644\u0627 \u062e\u0648\u0628 \u0628\u0647 \u0646\u0638\u0631 \u0645\u06cc \u0631\u0633\u062f\u060c \u0627\u0645\u0627 \u062e\u0637\u0627\u06cc \u00ab\u0646\u0648\u0639\u06cc \u062e\u0637\u0627\u06cc \u06a9\u0634\u0641 \u0646\u0634\u062f\u0647: \u0646\u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0648\u06cc\u0698\u06af\u06cc \u0631\u0627 \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0646\u062f\u00bb \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u062f<\/p>\n<p>\u0627\u06af\u0631 \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0631\u0627 \u0628\u0627\u0644\u0627\u06cc \u0633\u0627\u06cc\u0631 \u0639\u0646\u0627\u0635\u0631 DOM \u0642\u0631\u0627\u0631 \u062f\u0647\u06cc\u062f\u060c \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0628\u0627\u0632 \u0647\u0645 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u0634\u0648\u062f:<\/p>\n<pre class=\"language-html\" tabindex=\"0\"><code class=\"language-html\"><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>Uncaught Typeerror Error Tutorial<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>app.js<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1 <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>heading<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span><\/code><\/pre>\n<p>\u0627\u06a9\u0646\u0648\u0646 \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627\u0644\u0627\u06cc \u0639\u0646\u0627\u0635\u0631 DOM \u062f\u0631 \u062a\u06af \u0628\u062f\u0646\u0647 \u0642\u0631\u0627\u0631 \u062f\u0627\u0631\u062f\u060c \u0627\u0645\u0627 \u0647\u0645\u0686\u0646\u0627\u0646 \u062e\u0637\u0627\u06cc \u201cuncapped typeerror: can set property\u201d \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f \u0632\u06cc\u0631\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0642\u0628\u0644 \u0627\u0632 DOM \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<aside class=\"link-preview\"><fieldset><legend>\u0628\u06cc\u0634\u062a\u0631 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f<\/legend><a target=\"_blank\" href=\"https:\/\/hostida.com\/blog\/how-to-fix-503-service-unavailable-error-in-wordpress\/\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/hostida.com\/blog\/wp-content\/uploads\/2022\/04\/5032.png\" alt=\"\u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0628\u06cc\u0634\u062a\u0631\" width=\"100\"\/><p>\u0627\u0631\u0648\u0631 \u06f5\u06f0\u06f3 \u0648\u0631\u062f\u067e\u0631\u0633 \u0686\u06cc\u0633\u062a \u0648 \u0686\u0637\u0648\u0631 \u0622\u0646 \u0631\u0627 \u0631\u0641\u0639 \u06a9\u0646\u06cc\u0645 - \u0647\u0627\u0633\u062a\u06cc\u062f\u0627<\/p><p><span><\/span><\/p><\/a><\/fieldset><\/aside>\n<p>\u0628\u0631\u0627\u06cc \u0631\u0641\u0639 \u0627\u06cc\u0646 \u062e\u0637\u0627\u060c \u0628\u0627\u06cc\u062f \u062a\u06af \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0631\u0627 \u062f\u0631\u0633\u062a \u0642\u0628\u0644 \u0627\u0632 \u062a\u06af \u0628\u0633\u062a\u0647 \u0634\u062f\u0646 \u0628\u062f\u0646\u0647 \u0642\u0631\u0627\u0631 \u062f\u0647\u06cc\u062f. \u0628\u0647 \u0627\u06cc\u0646 \u062a\u0631\u062a\u06cc\u0628\u060c \u062a\u0645\u0627\u0645 \u0639\u0646\u0627\u0635\u0631 DOM \u0642\u0628\u0644 \u0627\u0632 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u0645\u06cc \u0634\u0648\u0646\u062f.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0646\u0645\u0648\u0646\u0647 \u0627\u06cc \u0627\u0632 \u0642\u0631\u0627\u0631\u06af\u06cc\u0631\u06cc \u0635\u062d\u06cc\u062d \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<pre class=\"language-html\" tabindex=\"0\"><code class=\"language-html\"><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>Uncaught Typeerror Error Tutorial<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1 <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>heading<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>app.js<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span><\/code><\/pre>\n<p>\u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u06a9\u062f \u0628\u0627\u0644\u0627 \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f\u060c \u0639\u0646\u0635\u0631 h1 \u0645\u062a\u0646 \u0622\u0646 \u0631\u0627 \u0631\u0648\u06cc &#8220;This is a heading&#8221; \u062a\u0646\u0638\u06cc\u0645 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<h2>\u0627\u0634\u062a\u0628\u0627\u0647\u0627\u062a \u0627\u0645\u0644\u0627\u06cc\u06cc<\/h2>\n<p>\u062e\u0637\u0627\u0647\u0627\u06cc \u0627\u0645\u0644\u0627\u06cc\u06cc \u0645\u0646\u0628\u0639 \u062f\u06cc\u06af\u0631\u06cc \u0628\u0631\u0627\u06cc \u0627\u0641\u0632\u0627\u06cc\u0634 \u062e\u0637\u0627\u06cc \u00abuncaught typeerror: cannot set property\u00bb \u0647\u0633\u062a\u0646\u062f.<\/p>\n<p>\u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0648\u06cc\u0698\u06af\u06cc (ID \u06cc\u0627 \u06a9\u0644\u0627\u0633) \u0645\u0648\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0628\u0631\u0627\u06cc \u0634\u0646\u0627\u0633\u0627\u06cc\u06cc \u0639\u0646\u0635\u0631 DOM \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0631\u0627 \u0628\u0647 \u0627\u0634\u062a\u0628\u0627\u0647 \u062a\u0627\u06cc\u067e \u06a9\u0646\u06cc\u062f\u060c \u0642\u0637\u0639\u0627 \u06a9\u062f \u0634\u0645\u0627 null \u062e\u0648\u0627\u0647\u062f \u0634\u062f.<\/p>\n<p>\u062a\u0644\u0627\u0634 \u0628\u0631\u0627\u06cc \u062a\u062e\u0635\u06cc\u0635 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0628\u0647\u00a0 \u0645\u0642\u062f\u0627\u0631 null\u060c \u062e\u0637\u0627\u06cc \u201cuncapped typeerror: can set property\u201d \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f. \u0645\u062b\u0644\u0627:<\/p>\n<pre class=\"language-html\" tabindex=\"0\"><code class=\"language-html\"><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>Uncaught Typeerror Error Tutorial<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1 <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>heading<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>app.js<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span><\/code><\/pre>\n<pre class=\"language-js\" tabindex=\"0\"><code class=\"language-js\"><span class=\"token keyword\">let<\/span> heading <span class=\"token operator\">=<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'headin'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\nheading<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">=<\/span> <span class=\"token string\">'Hello World!'<\/span>\r\n<span class=\"token comment\">\/\/Uncaught TypeError: Cannot set properties of null (setting 'textContent')<\/span><\/code><\/pre>\n<h2>\u062f\u0633\u062a\u0631\u0633\u06cc \u0628\u0647\u00a0 DOM \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647<\/h2>\n<p>\u062f\u0631 \u0628\u062e\u0634 \u0622\u062e\u0631\u060c \u062f\u06cc\u062f\u06cc\u0645 \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0627\u0631\u062c\u0627\u0639 \u062f\u0627\u062f\u0646 \u0628\u0647 \u06cc\u06a9 \u0648\u06cc\u0698\u06af\u06cc \u063a\u0644\u0637 \u0627\u0645\u0644\u0627\u06cc\u06cc \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f \u0628\u0627\u0639\u062b \u0627\u06cc\u062c\u0627\u062f \u062e\u0637\u0627\u06cc \u00abuncaught typeerror: cannot set property\u00bb \u0634\u0648\u062f. \u0647\u0646\u06af\u0627\u0645\u06cc \u06a9\u0647 \u0633\u0639\u06cc \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u0628\u0647 \u0639\u0646\u0635\u0631 DOM \u06a9\u0647 \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0646\u06cc\u0645\u060c \u0647\u0645 \u0647\u0645\u06cc\u0646 \u0627\u062a\u0641\u0627\u0642 \u0645\u06cc \u0627\u0641\u062a\u062f.<\/p>\n<p>\u0628\u0647 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644 \u062a\u0648\u062c\u0647 \u06a9\u0646\u06cc\u062f:<\/p>\n<pre class=\"language-html\" tabindex=\"0\"><code class=\"language-html\"><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>Uncaught Typeerror Error Tutorial<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>app.js<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span><\/code><\/pre>\n<pre class=\"language-js\" tabindex=\"0\"><code class=\"language-js\"><span class=\"token keyword\">let<\/span> heading <span class=\"token operator\">=<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'headin'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\nheading<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">=<\/span> <span class=\"token string\">'Hello World!'<\/span>\r\n<span class=\"token comment\">\/\/Uncaught TypeError: Cannot set properties of null (setting 'textContent')<\/span><\/code><\/pre>\n<p>\u0647\u0645\u0627\u0646\u0637\u0648\u0631 \u06a9\u0647 \u0645\u0634\u0627\u0647\u062f\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u062f\u060c \u0645\u0627 \u0633\u0639\u06cc \u06a9\u0631\u062f\u06cc\u0645 \u0645\u062d\u062a\u0648\u0627\u06cc \u0645\u062a\u0646\u06cc\u00a0 \u0639\u0646\u0635\u0631 DOM \u06cc \u0631\u0627 \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u0648\u062c\u0648\u062f \u062e\u0627\u0631\u062c\u06cc \u0646\u062f\u0627\u0631\u062f. \u0647\u06cc\u0686 \u0639\u0646\u0635\u0631\u06cc \u062f\u0631 \u06a9\u062f HTML \u0645\u0627 \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0631\u062f \u06a9\u0647 \u062f\u0627\u0631\u0627\u06cc \u0634\u0646\u0627\u0633\u0647 &#8220;heading&#8221; \u0628\u0627\u0634\u062f\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 null \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f.<\/p>\n<p>\u0627\u06af\u0631 \u0628\u0647 \u0648\u0627\u0631\u062f \u06a9\u0631\u062f\u0646 \u0645\u062a\u063a\u06cc\u0631 heading \u062f\u0631 \u06a9\u0646\u0633\u0648\u0644 \u0627\u062f\u0627\u0645\u0647 \u062f\u0647\u06cc\u062f\u060c \u0645\u0642\u062f\u0627\u0631 null \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u062e\u0648\u0627\u0647\u06cc\u062f \u06a9\u0631\u062f.<\/p>\n<h2>\u0686\u06af\u0648\u0646\u0647 \u0645\u0634\u062e\u0635 \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u00abnull\u00bb \u06cc\u0627 \u00abundefined\u00bb \u0627\u0633\u062a<\/h2>\n<p>\u062a\u0627 \u0645\u0631\u062d\u0644\u0647\u00a0 \u0645\u062a\u0648\u062c\u0647 \u0634\u062f\u0647\u200c\u0627\u06cc\u062f \u06a9\u0647 \u062a\u062e\u0635\u06cc\u0635 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0628\u0647 \u0645\u062a\u063a\u06cc\u0631\u06cc \u06a9\u0647 null \u06cc\u0627 \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0627\u0633\u062a\u060c \u0628\u0647 \u0627\u062d\u062a\u0645\u0627\u0644 \u0632\u06cc\u0627\u062f \u0645\u0646\u062c\u0631 \u0628\u0647 \u062e\u0637\u0627\u06cc \u00abuncaught typeerror: cannot set property\u00bb \u0645\u06cc \u0634\u0648\u062f.<\/p>\n<p>\u0642\u0628\u0644 \u0627\u0632 \u0627\u06cc\u0646\u06a9\u0647 \u062f\u0631 \u0645\u0648\u0631\u062f \u0686\u06af\u0648\u0646\u06af\u06cc \u062a\u0639\u06cc\u06cc\u0646 null \u06cc\u0627 \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0628\u0648\u062f\u0646 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0635\u062d\u0628\u062a \u06a9\u0646\u06cc\u0645\u060c \u0628\u0647\u062a\u0631 \u0627\u0633\u062a \u062a\u0641\u0627\u0648\u062a \u0628\u06cc\u0646 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 null \u0648 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0631\u0627 \u062f\u0631\u06a9 \u06a9\u0646\u06cc\u0645.<\/p>\n<p>\u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u062e\u0627\u0644\u06cc \u06cc\u0627 \u0646\u0627\u0634\u0646\u0627\u062e\u062a\u0647 \u0628\u0647 \u0645\u062a\u063a\u06cc\u0631 \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u062f\u0647 \u0634\u0648\u062f \u062a\u0647\u06cc \u0645\u06cc \u0634\u0648\u062f. \u0628\u062e\u0634 \u0647\u0627\u06cc \u0642\u0628\u0644\u06cc \u0627\u06cc\u0646 \u0622\u0645\u0648\u0632\u0634 \u0646\u0645\u0648\u0646\u0647 \u0647\u0627\u06cc \u0639\u0645\u0644\u06cc \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 null \u0631\u0627 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f.<\/p>\n<p>\u0627\u0632 \u0633\u0648\u06cc \u062f\u06cc\u06af\u0631\u060c \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0632\u0645\u0627\u0646\u06cc undefined \u0627\u0633\u062a \u06a9\u0647 \u0647\u06cc\u0686 \u0645\u0642\u062f\u0627\u0631\u06cc \u0628\u0647 \u0622\u0646 \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u062f\u0647 \u0646\u0634\u062f\u0647 \u0628\u0627\u0634\u062f:<\/p>\n<pre class=\"language-js\" tabindex=\"0\"><code class=\"language-js\"><span class=\"token keyword\">let<\/span> age<span class=\"token punctuation\">;<\/span>\r\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token comment\">\/\/ undefined<\/span><\/code><\/pre>\n<p>\u062f\u0631 \u06a9\u062f \u0628\u0627\u0644\u0627\u060c \u0645\u062a\u063a\u06cc\u0631 age \u0627\u0639\u0644\u0627\u0645 \u0634\u062f\u0647 \u0628\u0648\u062f\u060c \u0627\u0645\u0627 \u0647\u06cc\u0686 \u0645\u0642\u062f\u0627\u0631\u06cc \u0628\u0647 \u0622\u0646 \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u062f\u0647 \u0646\u0634\u062f \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0648\u0642\u062a\u06cc \u0627\u06cc\u0646 \u06a9\u062f \u062f\u0631 \u06a9\u0646\u0633\u0648\u0644 \u0648\u0627\u0631\u062f \u06a9\u0631\u062f\u06cc\u0645\u060c undefined \u062a\u0639\u0628\u06cc\u0631 \u0634\u062f.<\/p>\n<p>\u0634\u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u00a0loose equality operator (==) \u0628\u0631\u0627\u06cc \u062a\u0639\u06cc\u06cc\u0646 \u062a\u0647\u06cc \u06cc\u0627 \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0628\u0648\u062f\u0646 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f. \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0645\u062b\u0627\u0644:<\/p>\n<pre class=\"language-html\" tabindex=\"0\"><code class=\"language-html\"><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>Uncaught Typeerror Error Tutorial<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1 <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>headin<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n    <span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script <span class=\"token attr-name\">src<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">=<\/span><span class=\"token punctuation\">\"<\/span>app.js<span class=\"token punctuation\">\"<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n  <span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span>\r\n<span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<span class=\"token punctuation\">&gt;<\/span><\/span><\/code><\/pre>\n<pre class=\"language-js\" tabindex=\"0\"><code class=\"language-js\"><span class=\"token keyword\">let<\/span> heading <span class=\"token operator\">=<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'headin'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>heading <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'Variable is null - cannot assign value to a null variable'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span>\r\nheading<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">=<\/span> <span class=\"token string\">'Hello World!'<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"XL3Kf\">\n<div class=\"a8FIud X0rvP L6rCcb\">\n<div data-show-delay-ms=\"250\" data-append-to-body=\"false\" data-propagate-tooltip-mouseover-events=\"true\" data-anchor-corner=\"bottom-end\" data-enable-skip-handler=\"false\" data-popup-corner=\"top-end\">\n<div class=\" B2mKhd eQGGme xGUN1\">\n<div class=\"pw1uU\" tabindex=\"0\" aria-hidden=\"true\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"usGWQd\" aria-live=\"polite\">\n<div class=\"KkbLmb\">\n<div class=\"lRu31\"><span class=\"HwtZe\" lang=\"fa\"><span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">\u062f\u0631 \u06a9\u062f \u0628\u0627\u0644\u0627\u060c \u0647\u0646\u06af\u0627\u0645 \u0627\u0631\u062c\u0627\u0639 \u0628\u0647 \u0639\u0646\u0635\u0631 DOM \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a\u060c \u06cc\u06a9 \u062e\u0637\u0627\u06cc \u0627\u0645\u0644\u0627\u06cc\u06cc \u062f\u0627\u0634\u062a\u06cc\u0645.<\/span><\/span> <span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">\u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u062f\u0633\u062a\u0648\u0631 if\u060c \u0628\u0631\u0631\u0633\u06cc \u06a9\u0631\u062f\u06cc\u0645 \u06a9\u0647 \u0622\u06cc\u0627 \u0645\u0642\u062f\u0627\u0631 \u0645\u062a\u063a\u06cc\u0631 heading null \u0627\u0633\u062a \u06cc\u0627 \u062e\u06cc\u0631: if (heading == null) {&#8230;}<\/span><\/span> <span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">\u0627\u0632 \u0622\u0646\u062c\u0627\u06cc\u06cc \u06a9\u0647 \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u062a\u0647\u06cc \u0628\u0631\u06af\u0631\u062f\u0627\u0646\u062f\u0647 \u0627\u0633\u062a\u060c &#8220;\u0645\u062a\u063a\u06cc\u0631 \u062e\u0627\u0644\u06cc \u0627\u0633\u062a &#8211; \u0646\u0645\u06cc \u062a\u0648\u0627\u0646 \u0645\u0642\u062f\u0627\u0631\u06cc \u0631\u0627 \u0628\u0647 \u06cc\u06a9 \u0645\u062a\u063a\u06cc\u0631 \u062a\u0647\u06cc \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u062f&#8221; \u062f\u0631 \u06a9\u0646\u0633\u0648\u0644 \u0627\u0632 \u0633\u06cc\u0633\u062a\u0645 \u062e\u0627\u0631\u062c \u0645\u06cc \u0634\u0648\u062f.<\/span><\/span><\/span><\/div>\n<div class=\"lRu31\"><span class=\"HwtZe\" lang=\"fa\"> <span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">\u0627\u06af\u0631 \u0645\u0642\u062f\u0627\u0631 null \u0631\u0627 \u062f\u0631\u06cc\u0627\u0641\u062a \u0646\u06a9\u0631\u062f\u0647 \u0628\u0648\u062f\u06cc\u0645\u060c \u06a9\u062f \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u0628\u0644\u0648\u06a9 else \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u062f.<\/span><\/span> <span class=\"jCAhz ChMk0b\"><span class=\"ryNqvb\">\u0627\u06af\u0631 \u062a\u0639\u062c\u0628 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0686\u0631\u0627 undefined \u0631\u0627 \u062f\u0631 \u062f\u0633\u062a\u0648\u0631 if \u0648\u0627\u0631\u062f \u0646\u06a9\u0631\u062f\u0647\u200c\u0627\u06cc\u0645\u060c \u0628\u0627\u06cc\u062f \u0628\u06af\u0648\u06cc\u06cc\u0645 \u06a9\u0647 null == \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u062a\u0639\u0631\u06cc\u0641 \u0646\u0634\u062f\u0647 \u0627\u0633\u062a\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u06a9\u062f \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u062f\u0633\u062a\u0648\u0631 if \u0647\u0631 \u062f\u0648 \u062e\u0637\u0627 \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/span><\/span><\/span><\/div>\n<div><aside class=\"link-preview\"><fieldset><legend>\u0628\u06cc\u0634\u062a\u0631 \u0628\u062e\u0648\u0627\u0646\u06cc\u062f<\/legend><a target=\"_blank\" href=\"https:\/\/hostida.com\/blog\/how-to-fix-the-wordpress-429-too-many-requests-error\/\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/hostida.com\/blog\/wp-content\/uploads\/2022\/04\/4293.png\" alt=\"\u0627\u0637\u0644\u0627\u0639\u0627\u062a \u0628\u06cc\u0634\u062a\u0631\" width=\"100\"\/><p>\u0627\u0631\u0648\u0631 \u06f4\u06f2\u06f9 \u0648\u0631\u062f\u067e\u0631\u0633 \u0686\u06cc\u0633\u062a \u0648 \u0686\u0637\u0648\u0631 \u0622\u0646 \u0631\u0627 \u0631\u0641\u0639 \u06a9\u0646\u06cc\u0645 \u061f - \u0647\u0627\u0633\u062a\u06cc\u062f\u0627<\/p><p><span><\/span><\/p><\/a><\/fieldset><\/aside><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u0647 \u060c \u0647\u0646\u06af\u0627\u0645 \u06a9\u0627\u0631 \u0628\u0627 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0628\u0627 \u062e\u0637\u0627\u0647\u0627\u06cc\u06cc \u0645\u0648\u0627\u062c\u0647 \u062e\u0648\u0627\u0647\u06cc\u062f \u0634\u062f.\u0628\u0631\u0627\u06cc \u0627\u06cc\u0646\u06a9\u0647 \u0628\u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u06cc\u0646 \u062e\u0637\u0627\u0647\u0627 \u0631\u0627 \u0628\u0631\u0637\u0631\u0641 \u06a9\u0646\u06cc\u062f\u060c \u0628\u0627\u06cc\u062f \u0628\u062a\u0648\u0627\u0646\u06cc\u062f \u067e\u06cc\u0627\u0645 \u062e\u0637\u0627 \u0631\u0627 \u062f\u0631\u06a9 \u06a9\u0646\u06cc\u062f\u060c \u0627\u06cc\u0646 \u06a9\u0627\u0631 \u0628\u0647 \u0634\u0645\u0627 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0645\u062a\u0648\u062c\u0647 \u0634\u0648\u06cc\u062f \u06a9\u0647 \u0686\u0631\u0627 \u062e\u0637\u0627 \u0645\u0637\u0631\u062d \u0634\u062f\u0647 \u0627\u0633\u062a \u0648 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0622\u0646 \u0631\u0627 \u0628\u0631\u0637\u0631\u0641 \u06a9\u0646\u06cc\u062f. \u062f\u0631 [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":9024,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[23,204,202],"tags":[],"class_list":["post-9021","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorial","category-web-developer","category-online-business"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.4 (Yoast SEO v24.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u0646\u062d\u0648\u0647 \u0631\u0641\u0639 \u062e\u0637\u0627\u06cc \u00abuncaught typeerror: cannot set property\u00bb \u062f\u0631 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a - \u0647\u0627\u0633\u062a\u06cc\u062f\u0627<\/title>\n<meta name=\"description\" content=\"\u062f\u0631 \u0627\u06cc\u0646 \u0622\u0645\u0648\u0632\u0634\u060c \u0645\u0627 \u062f\u0631 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