{"id":25621,"date":"2023-06-04T14:04:26","date_gmt":"2023-06-04T10:34:26","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/how-to-detect-unnecessary-renderings-of-dom-elements-in-your-web-app-to-improve-performances-13jd\/"},"modified":"2023-06-04T14:04:26","modified_gmt":"2023-06-04T10:34:26","slug":"how-to-detect-unnecessary-renderings-of-dom-elements-in-your-web-app-to-improve-performances-13jd","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/how-to-detect-unnecessary-renderings-of-dom-elements-in-your-web-app-to-improve-performances-13jd\/","title":{"rendered":"\u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0631\u0646\u062f\u0631\u0647\u0627\u06cc \u063a\u06cc\u0631 \u0636\u0631\u0648\u0631\u06cc \u0639\u0646\u0627\u0635\u0631 DOM \u0631\u0627 \u062f\u0631 \u0628\u0631\u0646\u0627\u0645\u0647 \u0648\u0628 \u062e\u0648\u062f \u0628\u0631\u0627\u06cc \u0628\u0647\u0628\u0648\u062f \u0639\u0645\u0644\u06a9\u0631\u062f 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\u0634\u0646\u0627\u0633\u0647 \u0645\u0646\u062d\u0635\u0631\u0628\u0647\u200c\u0641\u0631\u062f \u0631\u062f\u06cc\u0627\u0628\u06cc \u06a9\u0646\u062f \u062a\u0627 \u0628\u062f\u0627\u0646\u062f \u0622\u06cc\u0627 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f \u0627\u0632 \u06cc\u06a9 \u0639\u0646\u0635\u0631 \u0645\u062c\u062f\u062f\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u062f \u06cc\u0627 \u062e\u06cc\u0631.  \u0627\u06cc\u0646 \u067e\u0633\u062a \u0648\u0628\u0644\u0627\u06af \u062f\u0631 \u0645\u0648\u0631\u062f Angular \u0646\u06cc\u0633\u062a\u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0645\u0646 \u062f\u0631 \u0645\u0648\u0631\u062f \u0631\u0641\u0639 \u0645\u0634\u06a9\u0644 \u0646\u0645\u06cc \u0645\u0627\u0646\u0645\u060c \u0627\u0645\u0627 \u0627\u06af\u0631 \u0627\u0632 a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645 <code>trackBy<\/code> \u0628\u0631 \u0631\u0648\u06cc &#8230; \u0645\u0627 <code>ngFor<\/code> \u0645\u062b\u0644 \u0627\u06cc\u0646 <code>*ngFor=\"let person of people; trackBy: trackById\"<\/code> \u0648 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f <code>trackById<\/code> \u0639\u0645\u0644\u06a9\u0631\u062f \u0628\u0647 \u0639\u0646\u0648\u0627\u0646<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight typescript\"><code><span class=\"k\">public<\/span> <span class=\"nx\">trackById<\/span><span class=\"p\">(<\/span><span class=\"nx\">_<\/span><span class=\"p\">:<\/span> <span class=\"kr\">number<\/span><span class=\"p\">,<\/span> <span class=\"nx\">person<\/span><span class=\"p\">:<\/span> <span class=\"nx\">Person<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\n  <span class=\"k\">return<\/span> <span class=\"nx\">person<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"p\">;<\/span>\n<span class=\"p\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0633\u067e\u0633 Angular 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\u06cc\u0627 \u0647\u0632\u0627\u0631\u0627\u0646 \u0639\u0646\u0635\u0631 DOM \u0631\u0627 \u0628\u0627 \u0633\u0631\u0639\u062a \u0632\u06cc\u0627\u062f \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc\u200c\u06a9\u0646\u06cc\u062f \u062a\u0627 \u062a\u063a\u06cc\u06cc\u0631\u0627\u062a \u0633\u0631\u06cc\u0639 \u062f\u0631 \u062f\u0627\u062f\u0647\u200c\u0647\u0627 \u0631\u0627 \u0645\u0646\u0639\u06a9\u0633 \u06a9\u0646\u062f\u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0645\u0634\u06a9\u0644 \u0633\u0627\u0632 \u0634\u0648\u062f.<\/p>\n<p>\u0627\u0645\u06cc\u062f\u0648\u0627\u0631\u0645 \u0627\u0632 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0644\u0630\u062a \u0628\u0631\u062f\u0647 \u0628\u0627\u0634\u06cc\u062f.  \u0627\u06af\u0631 \u0628\u0647 \u0646\u06a9\u0627\u062a \u0628\u06cc\u0634\u062a\u0631\u06cc \u062f\u0631 \u0645\u0648\u0631\u062f Angular\u060c RxJS\u060c \u0645\u0646\u0628\u0639 \u0628\u0627\u0632\u060c \u0645\u06cc\u0632\u0628\u0627\u0646\u06cc 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