{"id":39534,"date":"2023-03-20T13:49:42","date_gmt":"2023-07-18T23:41:50","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/angular-%e6%9f%a5%e7%9c%8b%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f%e6%96%b9%e6%b3%95ngdocheck\/"},"modified":"2024-04-29T19:47:06","modified_gmt":"2024-04-29T11:47:06","slug":"angular-%e6%9f%a5%e7%9c%8b%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f%e6%96%b9%e6%b3%95ngdocheck","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/angular-%e6%9f%a5%e7%9c%8b%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f%e6%96%b9%e6%b3%95ngdocheck\/","title":{"rendered":"[Angular] \u67e5\u770b\u751f\u547d\u5468\u671f\u65b9\u6cd5(ngDoCheck)"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u7ee7\u7eed\u9605\u8bfb\u4ee5\u4e0b\u6587\u7ae0\u3002<br \/>\n\u8fd9\u6b21\u6211\u4eec\u6765\u8ba8\u8bba\u4e00\u4e0b ngDoCheck\u3002<\/p>\n<h1>\u6700\u65b0\u6d88\u606f<\/h1>\n<h2>2021\u5e741\u67082\u65e5<\/h2>\n<ul class=\"post-ul\">\u8a18\u4e8b\u5185\u3067\u6271\u3063\u305f\u30b3\u30fc\u30c9\u3092 Angular v11.0.5 \u3067\u78ba\u8a8d\u3057\u307e\u3057\u305f<\/ul>\n<h1>\u5de5\u4f5c\u73af\u5883<\/h1>\n<div>\n<div class=\"post-table\">\u74b0\u5883\u30d0\u30fc\u30b8\u30e7\u30f3\u5099\u8003<a href=\"https:\/\/cli.angular.io\/\" target=\"_blank\" rel=\"nofollow noopener\">Angular CLI<\/a><del>v1.6.3<\/del> v11.0.5<code>$ ng --version<\/code><a href=\"https:\/\/angular.io\/\" target=\"_blank\" rel=\"nofollow noopener\">Angular<\/a><del>v4.4.6<\/del> v11.0.5\u540c\u4e0a<a href=\"https:\/\/www.typescriptlang.org\/\" target=\"_blank\" rel=\"nofollow noopener\">TypeScript<\/a>v4.0.2\u540c\u4e0a<a href=\"https:\/\/nodejs.org\/ja\/\" target=\"_blank\" rel=\"nofollow noopener\">Node.js<\/a><del>v9.2.1<\/del> v12.18.3<code>$ node --version<\/code><a href=\"https:\/\/www.npmjs.com\/\" target=\"_blank\" rel=\"nofollow noopener\">npm<\/a><del>v5.6.0<\/del> v6.14.6<code>$ npm --version<\/code><\/div>\n<\/div>\n<details>ng version \u7684\u7ed3\u679c$ ng version<\/p>\n<p>_ _ ____ _ ___<br \/>\n\/ \\ _ __ __ _ _ _| | __ _ _ __ \/ ___| | |_ _|<br \/>\n\/ \u25b3 \\ | &#8216;_ \\ \/ _` | | | | |\/ _` | &#8216;__| | | | | | |<br \/>\n\/ ___ \\| | | | (_| | |_| | | (_| | | | |___| |___ | |<br \/>\n\/_\/ \\_\\_| |_|\\__, |\\__,_|_|\\__,_|_| \\____|_____|___|<br \/>\n|___\/<\/p>\n<p>Angular CLI: 11.0.5<br \/>\nNode: 12.18.3<br \/>\nOS: darwin x64<\/p>\n<p>Angular: 11.0.5<br \/>\n&#8230; animations, cli, common, compiler, compiler-cli, core, forms<br \/>\n&#8230; platform-browser, platform-browser-dynamic, router<br \/>\nIvy Workspace: Yes<\/p>\n<p>Package Version<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<br \/>\n@angular-devkit\/architect 0.1100.5<br \/>\n@angular-devkit\/build-angular 0.1100.5<br \/>\n@angular-devkit\/core 11.0.5<br \/>\n@angular-devkit\/schematics 11.0.5<br \/>\n@schematics\/angular 11.0.5<br \/>\n@schematics\/update 0.1100.5<br \/>\nrxjs 6.6.0<br \/>\ntypescript 4.0.2<\/p>\n<\/details>\n<h1>\u76f8\u5173\u6587\u7ae0<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">[Angular] \u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30e1\u30bd\u30c3\u30c9\u3092\u307f\u308b(ngOnChanges \u3068 ngOnInit \u3068 ngOnDestroy)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">[Angular] \u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30e1\u30bd\u30c3\u30c9\u3092\u307f\u308b(ngAfterContentInit \u3068 ngAfterContentChecked)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">[Angular] \u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30e1\u30bd\u30c3\u30c9\u3092\u307f\u308b(ngAfterViewInit \u3068 ngAfterViewChecked)<\/ul>\n<h1>ngDoCheck \u53ef\u4ee5\u7ffb\u8bd1\u4e3a&#8221;\u8fdb\u884c\u68c0\u67e5&#8221;\u3002<\/h1>\n<p>\u6bcf\u6b21\u8fd0\u884cChange Detection\u65f6\uff0cngDoCheck\u90fd\u4f1a\u6267\u884c\u3002<br \/>\n\u5728\u67e5\u770b\u5b98\u65b9\u7684API\u89c4\u8303\u65f6\uff0c\u4f5c\u4e3a\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<blockquote><p>\u8bf7\u6ce8\u610f\uff0c\u6307\u4ee4\u901a\u5e38\u4e0d\u5e94\u540c\u65f6\u4f7f\u7528DoCheck\u548cOnChanges\u6765\u54cd\u5e94\u540c\u4e00\u8f93\u5165\u7684\u66f4\u6539\uff0c\u56e0\u4e3a\u5f53\u9ed8\u8ba4\u7684\u53d8\u66f4\u68c0\u6d4b\u5668\u68c0\u6d4b\u5230\u66f4\u6539\u65f6\uff0cngOnChanges\u5c06\u7ee7\u7eed\u88ab\u8c03\u7528\u3002<\/p><\/blockquote>\n<p>\u67d0\u4e2a\u3002<\/p>\n<p>\u901a\u8fc7\u6df7\u5408\u4f7f\u7528 ngOnChanges \u548c ngDoCheck \u6765\u786e\u8ba4\u4e3a\u4ec0\u4e48\u4f1a\u88ab\u8bf4\u51fa\u90a3\u6837\u7684\u8bdd\u3002<br \/>\n\uff08\u5728\u4e0b\u9762\u53ea\u63d0\u4f9b\u4e86\u5b50\u7ec4\u4ef6\u7684\u4ee3\u7801\u3002\u7701\u7565\u4e86\u7236\u7ec4\u4ef6\u7684\u4ee3\u7801\uff0c\u56e0\u4e3a\u5b83\u4e0e\u8fd9\u7bc7\u6587\u7ae0\u76f8\u540c\u3002\uff09<\/p>\n<h2>\u6a21\u677f<\/h2>\n<p>\u5728\u7ec4\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u5757\u6765\u663e\u793a\u4ece\u7236\u7ec4\u4ef6\u4f20\u9012\u7684\u503c\uff0c\u5e76\u4e14\u8fd8\u53ef\u4ee5\u51c6\u5907\u4e00\u4e2a\u5757\u6765\u8fdb\u884c\u5b50\u7ec4\u4ef6\u81ea\u8eab\u7684\u8f93\u5165\u548c\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nt\">&lt;p&gt;<\/span>\r\n  \u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u5165\u529b\u3055\u308c\u305f\u5024\u306f... {{hogeInputValue}}\r\n<span class=\"nt\">&lt;\/p&gt;<\/span>\r\n\r\n<span class=\"nt\">&lt;label<\/span> <span class=\"na\">for=<\/span><span class=\"s\">\"inputText\"<\/span><span class=\"nt\">&gt;<\/span>\u5165\u529b\u9805\u76ee(\u5b50\u3060\u3051):<span class=\"nt\">&lt;\/label&gt;<\/span>\r\n<span class=\"nt\">&lt;input<\/span> <span class=\"na\">id=<\/span><span class=\"s\">\"inputText\"<\/span> <span class=\"na\">name=<\/span><span class=\"s\">\"inputText\"<\/span> <span class=\"na\">type=<\/span><span class=\"s\">\"text\"<\/span> <span class=\"na\">[(ngModel)]=<\/span><span class=\"s\">\"ngDoCheckValue\"<\/span> <span class=\"nt\">\/&gt;<\/span>\r\n<span class=\"nt\">&lt;p&gt;<\/span>\r\n  \u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u5165\u529b\u3055\u308c\u305f\u5024\u306f... {{ngDoCheckValue}}\r\n<span class=\"nt\">&lt;\/p&gt;<\/span>\r\n<\/code><\/pre>\n<h2>\u73ed\u7ea7<\/h2>\n<p>\u9664\u4e86\u4ece\u7236\u7ec4\u4ef6\u63a5\u6536\u6570\u636e\u7684 `ngOnChangesValue` \u5c5e\u6027\u4e4b\u5916\uff0c\u8fd8\u5b9a\u4e49\u4e86\u7528\u4e8e\u81ea\u8eab\u8f93\u5165\u8f93\u51fa\u7684 `ngDoCheckValue` \u5c5e\u6027\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ DoCheck \u306f ngDoCheck \u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">Component<\/span><span class=\"p\">,<\/span> <span class=\"nx\">OnInit<\/span><span class=\"p\">,<\/span> <span class=\"nx\">Input<\/span><span class=\"p\">,<\/span> <span class=\"nx\">OnChanges<\/span><span class=\"p\">,<\/span> <span class=\"nx\">DoCheck<\/span><span class=\"p\">,<\/span> <span class=\"nx\">SimpleChanges<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">@angular\/core<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"p\">@<\/span><span class=\"nd\">Component<\/span><span class=\"p\">({<\/span>\r\n  <span class=\"na\">selector<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">app-hoge-hoge<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">templateUrl<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/hoge-hoge.component.html<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">styleUrls<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"dl\">'<\/span><span class=\"s1\">.\/hoge-hoge.component.css<\/span><span class=\"dl\">'<\/span><span class=\"p\">]<\/span>\r\n<span class=\"p\">})<\/span>\r\n<span class=\"k\">export<\/span> <span class=\"kd\">class<\/span> <span class=\"nx\">HogeHogeComponent<\/span> <span class=\"k\">implements<\/span> <span class=\"nx\">OnInit<\/span><span class=\"p\">,<\/span> <span class=\"nx\">OnChanges<\/span><span class=\"p\">,<\/span> <span class=\"nx\">DoCheck<\/span> <span class=\"p\">{<\/span>\r\n\r\n  <span class=\"cm\">\/**\r\n   * ngOnChanges \u306e\u78ba\u8a8d\u306e\u305f\u3081\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\r\n   *\r\n   * @type {String}\r\n   * @memberof HogeHogeComponent\r\n   *\/<\/span>\r\n  <span class=\"p\">@<\/span><span class=\"nd\">Input<\/span><span class=\"p\">()<\/span>\r\n  <span class=\"nx\">ngOnChangesValue<\/span><span class=\"p\">:<\/span> <span class=\"nb\">String<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">''<\/span><span class=\"p\">;<\/span>\r\n\r\n  <span class=\"cm\">\/**\r\n   * ngDoCheck \u306e\u78ba\u8a8d\u306e\u305f\u3081\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\r\n   *\r\n   * @type {String}\r\n   * @memberof HogeHogeComponent\r\n   *\/<\/span>\r\n  <span class=\"nl\">ngDoCheckValue<\/span><span class=\"p\">:<\/span> <span class=\"nb\">String<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Initial Value<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n  <span class=\"kd\">constructor<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">[constructor] fired<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nx\">ngOnInit<\/span><span class=\"p\">():<\/span> <span class=\"k\">void<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">[ngOnInit] fired<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nx\">ngOnChanges<\/span><span class=\"p\">(<\/span><span class=\"nx\">changes<\/span><span class=\"p\">:<\/span> <span class=\"nx\">SimpleChanges<\/span><span class=\"p\">):<\/span> <span class=\"k\">void<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">[ngOnChanges] fired. ngOnChangesValue={<\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">ngOnChangesValue<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">}<\/span><span class=\"dl\">'<\/span> <span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nx\">ngDoCheck<\/span><span class=\"p\">():<\/span> <span class=\"k\">void<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">[ngDoCheck] fired. ngDoCheckValue={<\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">ngDoCheckValue<\/span> <span class=\"o\">+<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">}<\/span><span class=\"dl\">'<\/span> <span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u786e\u8ba4\u6267\u884c\u7ed3\u679c<\/h2>\n<p>\u8fd0\u884c\u4ee3\u7801\u65f6\uff0c\u5728\u65e5\u5fd7\u4e2d\u4f1a\u8f93\u51fa\u5982\u4e0b\u5185\u5bb9\u3002<\/p>\n<h3>\u521a\u521a\u542f\u52a8<\/h3>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d3a9c37434c4406c7e7f2\/26-0.png\" alt=\"ngDoCheck-01.png\" \/><\/div>\n<p>\u5728\u8f93\u51fa ngOnChanges \u7684\u65e5\u5fd7\u4e4b\u540e\u8f93\u51fa ngOnInit \u7684\u65e5\u5fd7\uff0c\u7136\u540e\u8f93\u51fa ngDoCheck \u7684\u65e5\u5fd7\u3002<\/p>\n<p>ngOnChanges -&gt; ngOnInit -&gt; ngDoCheck \u306e\u9806\u306b\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b<\/p>\n<p>\u80fd\u591f\u786e\u8ba4\u8fd9\u4e00\u70b9\u3002\u5c31\u50cf\u539f\u59cb\u7684\u751f\u547d\u5468\u671f\u94a9\u5b50\u56fe\u4e2d\u6240\u793a\u7684\u90a3\u6837\u3002<br \/>\n\u4ee4\u4eba\u5728\u610f\u7684\u662f<\/p>\n<pre class=\"post-pre\"><code>Angular is running in the development mode. Call enableProdMode() to enable the production mode.\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u7ea2\u6846\u5708\u51fa\u7684\u65e5\u5fd7\uff08\u8fd9\u662fAngular\u8f93\u51fa\u7684\uff09\u662f\u6307\uff0c\u5728\u8fd9\u4e2a\u65e5\u5fd7\u4e4b\u540e\uff0cngDoCheck\u7684\u65e5\u5fd7\u518d\u6b21\u88ab\u8f93\u51fa\u7684\u5730\u65b9\u3002\u7531\u6b64\u53ef\u77e5\uff0c\u5982\u679cDOM\u53d1\u751f\u4e86\u53d8\u5316\uff0cngDoCheck\u5c06\u4f1a\u8fd0\u884c\u3002<\/p>\n<h3>\u5f53\u5355\u72ec\u8fd0\u884cngDoCheck\u65f6\uff0c\u9a8c\u8bc1\u5176\u64cd\u4f5c\u3002<\/h3>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u786e\u8ba4\u5e94\u7528\u7a0b\u5e8f\u5728\u542f\u52a8\u5e76\u5b8c\u6210\u753b\u9762\u663e\u793a\u540e\uff0c\u6267\u884c ngDoCheck() \u64cd\u4f5c\u7684\u884c\u4e3a\u3002<br \/>\n\uff08\u5728\u6b64\u671f\u95f4\uff0c\u6211\u4eec\u4f7f\u7528 F5 \u952e\u91cd\u65b0\u52a0\u8f7d\u5e94\u7528\u7a0b\u5e8f\u8fdb\u884c\u518d\u6b21\u8fd0\u884c\uff09<\/p>\n<p>\u6211\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5c06&#8221;change value&#8221;\u590d\u5236\u7c98\u8d34\u5230&#8221;\u8f93\u5165\u9879\u76ee(\u4ec5\u9650\u5b50\u9879)&#8221;\u7684\u8868\u5355\u4e2d\u53bb<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5c06\u7126\u70b9\u4ece\u8f93\u5165\u8868\u5355\u8f6c\u79fb\u5f00<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d3a9c37434c4406c7e7f2\/36-0.png\" alt=\"ngDoCheck-03.png\" \/><\/div>\n<p>\u5f9e\u65e5\u8a8c\u4e2d<\/p>\n<ul class=\"post-ul\">\u753b\u9762\u8d77\u52d5\u5f8c\u306b\u51fa\u529b\u3055\u308c\u305f\u30ed\u30b0\u306e\u5f8c\u306b\u3001\u4eca\u56de\u306e\u64cd\u4f5c\u306b\u3088\u3063\u3066\u51fa\u529b\u3055\u308c\u305f [ngDoCheck] fired. ngDoCheckValue={change value} \u3060\u3051\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u308b\u3053\u3068<\/ul>\n<p>\u6211\u53ef\u4ee5\u7406\u89e3\u3002<br \/>\n\u8fd9\u53ef\u4ee5\u89e3\u91ca\u4e3a\u53ea\u68c0\u6d4b\u5b50\u7ec4\u4ef6\uff08\u4e5f\u5c31\u662f\u81ea\u8eab\uff09\u7684\u66f4\u6539\u503c\uff0c\u5e76\u4e14\u4ec5\u6267\u884cngDoCheck\u3002<br \/>\n\u5173\u4e8engDoCheck\u65e5\u5fd7\u7684\u5f00\u5934\u663e\u793a\u6570\u5b57\u201c2\u201d\uff0c\u7a0d\u540e\u4f1a\u8be6\u7ec6\u8bf4\u660e\u3002<\/p>\n<h3>\u786e\u8ba4\u5728\u8fd0\u884cngOnChanges\u65f6\u7684\u884c\u4e3a<\/h3>\n<p>\u8fd9\u6b21\u6211\u4eec\u5c1d\u8bd5\u5728\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u5e76\u5b8c\u6210\u9875\u9762\u663e\u793a\u4e4b\u540e\uff0c\u6267\u884c ngOnChanges \u64cd\u4f5c\u65f6\uff0c\u786e\u8ba4 ngDoCheck \u7684\u8fd0\u4f5c\u60c5\u51b5\u3002<br \/>\n\uff08\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u4f7f\u7528 F5 \u5feb\u6377\u952e\u6765\u8fdb\u884c\u5237\u65b0\uff08\u91cd\u65b0\u6267\u884c\u5e94\u7528\u7a0b\u5e8f\uff09\uff09<\/p>\n<p>\u6211\u8fdb\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5c06\u300cchange value\u300d\u590d\u5236\u7c98\u8d34\u5230\u300c\u8f93\u5165\u9879\u76ee\uff08\u7531\u7236\u53ca\u5b50\uff09\u300d\u7684\u8868\u5355\u4e2d\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5c06\u7126\u70b9\u4ece\u8f93\u5165\u8868\u5355\u8f6c\u79fb\u3002<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d3a9c37434c4406c7e7f2\/44-0.png\" alt=\"ngDoCheck-02.png\" \/><\/div>\n<p>\u4ece\u65e5\u5fd7\u4e2d<\/p>\n<ul class=\"post-ul\">ngOnChanges \u306e\u5f8c\u306b ngDoCheck \u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3053\u3068<\/ul>\n<p>\u660e\u767d\u4e86\u3002<br \/>\n\u6240\u8c13\u7684\u610f\u601d\u662f\uff0cngDoCheck\u51fd\u6570\u53ef\u4ee5\u68c0\u6d4b\u5e76\u6267\u884cngOnChanges\u94a9\u5b50\u51fd\u6570\u4e2d\u4f20\u9012\u7684\u5c5e\u6027\uff08\u5373\u4ece\u7236\u7ec4\u4ef6\u4f20\u9012\u8fc7\u6765\u7684\u6570\u636e\uff09\u7684\u53d8\u5316\u3002<br \/>\n\u5173\u4e8engDoCheck\u65e5\u5fd7\u5f00\u5934\u663e\u793a\u6570\u5b57&#8221;2&#8243;\u7684\u95ee\u9898\uff0c\u7a0d\u540e\u4f1a\u8fdb\u884c\u8bf4\u660e\u3002<\/p>\n<h3>\u4e3a\u4ec0\u4e48\u5728 ngDoCheck \u7684\u65e5\u5fd7\u5f00\u5934\u663e\u793a\u6570\u5b57.<\/h3>\n<p>This number is a counter and it increases every time the same log is outputted.<br \/>\nAs for why the same log is being outputted, it is due to the aforementioned operation. (Translation may vary slightly based on contextual understanding)<\/p>\n<blockquote><p>\u5c06\u7126\u70b9\u4ece\u8f93\u5165\u8868\u5355\u8f6c\u79fb<\/p><\/blockquote>\n<p>\u8be6\u7ec6\u5730\u89c2\u5bdf\u540e\u53d1\u73b0\uff0c\u5217\u51fa\u4e86\u8fd9\u4e00\u9879\u76ee\u3002\u8fd9\u662f\u5bfc\u81f4\u76f8\u540c\u65e5\u5fd7\u8f93\u51fa\u7684\u539f\u56e0\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6267\u884cNgOnChange\u6216NgDoCheck\u64cd\u4f5c<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5728\u8fd9\u91cc\u66f4\u65b0\u6bcf\u4e2a\u8f93\u5165\u503c<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u8fd9\u6837\u5c31\u4f1a\u89e6\u53d1NgDoCheck\uff0c\u5e76\u5728\u65e5\u5fd7\u4e2d\u8f93\u51fa[ngDoCheck] fired. ngDoCheckValue={change value}<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7136\u540e\u5c06\u7126\u70b9\u4ece\u8f93\u5165\u8868\u5355\u79fb\u5f00<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u53ef\u4ee5\u901a\u8fc7TAB\u952e\u6216\u9f20\u6807\u70b9\u51fb\u8fdb\u884c\u79fb\u52a8<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u8fd9\u6837\u5c31\u4f1a\u89e6\u53d1NgDoCheck<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7531\u4e8e\u8f93\u5165\u503c\u6ca1\u6709\u6539\u53d8\uff0c\u6240\u4ee5\u4f1a\u8f93\u51fa\u76f8\u540c\u7684\u65e5\u5fd7([ngDoCheck] fired. ngDoCheckValue={change value})<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u7531\u4e8e\u8f93\u51fa\u7684\u65e5\u5fd7\u76f8\u540c\uff0c\u6570\u5b57\u4f1a\u9012\u589e<\/ol>\n<p>\u800c\u4e14\uff0c\u5373\u4f7f\u91cd\u65b0\u805a\u7126\u8f93\u5165\u8868\u5355\uff0c\u65e5\u5fd7\u4e5f\u4f1a\u8fdb\u884c\u8ba1\u6570(\u6267\u884cngDoCheck)\u3002<\/p>\n<h2>\u901a\u8fc7\u52a8\u4f5c\u786e\u8ba4\u53ef\u4ee5\u4e86\u89e3\u5230\u7684\u4fe1\u606f\u3002<\/h2>\n<p>\u901a\u8fc7\u4e0a\u8ff0\u7684\u64cd\u4f5c\u786e\u8ba4\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\u4ee5\u4e0b\u7ed3\u8bba\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a2\u30d7\u30ea\u8d77\u52d5\u6642\u306e\u5b9f\u884c\u9806\u5e8f\u306f Lifecycle Hooks \u306e\u56f3\u9762\u306e\u901a\u308a<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ngDoCheck \u306f ngOnChanges \u304c\u30d5\u30c3\u30af\u3057\u3066\u3044\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5909\u66f4\u3082\u691c\u77e5\u3057\u3066\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">ngDoCheck \u306f\u5165\u529b\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u30d5\u30a9\u30fc\u30ab\u30b9\u304c\u5916\u308c\u305f\u308a\u518d\u30d5\u30a9\u30fc\u30ab\u30b9\u3055\u308c\u3066\u3082\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<p>\u4e0d\u5e94\u8be5\u540c\u65f6\u4f7f\u7528 ngOnChanges \u548c ngDoCheck \u7684\u539f\u56e0\u662f\u5728\u5f00\u5934\u6240\u5199\u7684\u3002<\/p>\n<p>ngDoCheck \u306f ngOnChanges \u304c\u30d5\u30c3\u30af\u3057\u3066\u3044\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5909\u66f4\u3082\u691c\u77e5\u3057\u3066\u5b9f\u884c\u3055\u308c\u308b<\/p>\n<p>\u5728`ngOnChanges`\u4e2d\u68c0\u6d4b\u5c5e\u6027\u7684\u53d8\u5316\u5e76\u8fdb\u884c\u5904\u7406\u65f6\uff0c\u8fd9\u4e2a\u53d8\u5316\u5c06\u4f1a\u89e6\u53d1`ngDoCheck`\u7684\u6267\u884c\uff0c\u53ef\u80fd\u4f1a\u5e26\u6765\u989d\u5916\u7684\u6027\u80fd\u8d1f\u62c5\u3002<br \/>\n\u6b64\u5916\uff0c`ngOnChanges`\u53ef\u80fd\u4f1a\u5f15\u53d1\u4e00\u4e9b\u9519\u8bef\uff0c\u4f8b\u5982\u5728`ngOnChanges`\u4e2d\u4fee\u6539\u4e86\u503c\uff0c\u7136\u540e\u5728`ngDoCheck`\u4e2d\u518d\u6b21\u66f4\u65b0\u5b83\u3002<\/p>\n<p>\u9664\u4e86\u4e0a\u8ff0\u7684\u5185\u5bb9\u4ee5\u5916<\/p>\n<ul class=\"post-ul\">ngDoCheck \u306f\u5165\u529b\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u30d5\u30a9\u30fc\u30ab\u30b9\u304c\u5916\u308c\u305f\u308a\u518d\u30d5\u30a9\u30fc\u30ab\u30b9\u3055\u308c\u3066\u3082\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<p>\u4ece\u8fd9\u4e2a\u4e8b\u5b9e\u6765\u770b\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa ngDoCheck \u65b9\u6cd5\u4f1a\u9891\u7e41\u5730\u88ab\u6267\u884c\u3002<\/p>\n<h1>\u603b\u7ed3\u8d77\u6765<\/h1>\n<p>\u6211\u5df2\u7ecf\u786e\u8ba4\u4e86ngDoCheck\u7684\u64cd\u4f5c\uff0c\u4f46\u7531\u4e8e\u4e0engOnChanges\u7684\u7ec4\u5408\u95ee\u9898\u4ee5\u53ca\u8c03\u7528\u9891\u7387\u7b49\u7b49\uff0c\u6211\u89c9\u5f97\u8fd9\u4e2a\u65b9\u6cd5\u5728\u4f7f\u7528\u4e0a\u5f88\u56f0\u96be\u3002<\/p>\n<p>\u5728\u672c\u5bb6\u7684DoCheck\u51fd\u6570\u4e2d\u6709\u4ee5\u4e0b\u4e00\u53e5\u8bdd\u3002<\/p>\n<blockquote><p>\u4f7f\u7528\u6b64\u65b9\u6cd5\u6765\u68c0\u6d4bAngular\u5ffd\u7565\u7684\u53d8\u5316\u3002<\/p><\/blockquote>\n<p>\u7531\u4e8eAngular\u5ffd\u7565\u4e86\u8fd9\u79cd\u53d8\u5316\uff0c\u6211\u4eec\u9996\u5148\u8981\u4ece\u90a3\u91cc\u5f00\u59cb\u7406\u89e3\u3002<\/p>\n<p>\u6211\u4eec\u63a5\u4e0b\u6765\u6765\u770b\u4e00\u4e0b\u751f\u547d\u5468\u671f\u65b9\u6cd5\u3002<\/p>\n<h1>\u6e90\u4ee3\u7801<\/h1>\n<p>\u4ee5\u4e0b\u662f\u672c\u6b21\u6587\u7ae0\u4f7f\u7528\u7684\u4ee3\u7801\u7684\u64cd\u4f5c\u786e\u8ba4\uff0c\u8bf7\u53c2\u8003&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u7ee7\u7eed\u9605\u8bfb\u4ee5\u4e0b\u6587\u7ae0\u3002 \u8fd9\u6b21\u6211\u4eec\u6765\u8ba8\u8bba\u4e00\u4e0b ngDoCheck\u3002 \u6700\u65b0\u6d88\u606f 2021\u5e741\u67082\u65e5 \u8a18\u4e8b\u5185\u3067\u6271\u3063 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-39534","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Angular] \u67e5\u770b\u751f\u547d\u5468\u671f\u65b9\u6cd5(ngDoCheck) - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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