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  195. <h1 id="instanceof&#x8FD0;&#x7B97;&#x7B26;">instanceof&#x8FD0;&#x7B97;&#x7B26;</h1>
  196. <h4 id="&#x539F;&#x6587;"><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/instanceof" target="_blank">&#x539F;&#x6587;</a></h4>
  197. <hr>
  198. <h2 id="&#x8BED;&#x6CD5;">&#x8BED;&#x6CD5;</h2>
  199. <pre><code>object instanceof constructor
  200. </code></pre><blockquote>
  201. <p>&#x53C2;&#x6570;<br></p>
  202. <ol>
  203. <li>object &#x8981;&#x68C0;&#x6D4B;&#x7684;&#x5BF9;&#x8C61;.<br></li>
  204. <li>constructor &#x67D0;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;</li>
  205. </ol>
  206. </blockquote>
  207. <h2 id="&#x63CF;&#x8FF0;">&#x63CF;&#x8FF0;</h2>
  208. <blockquote>
  209. <p>instanceof &#x8FD0;&#x7B97;&#x7B26;&#x7528;&#x6765;&#x68C0;&#x6D4B; constructor.prototype &#x662F;&#x5426;&#x5B58;&#x5728;&#x4E8E;&#x53C2;&#x6570; object &#x7684;&#x539F;&#x578B;&#x94FE;&#x4E0A;&#x3002;</p>
  210. </blockquote>
  211. <pre><code>// &#x5B9A;&#x4E49;&#x6784;&#x9020;&#x51FD;&#x6570;
  212. function C(){}
  213. function D(){}
  214. var o = new C();
  215. // true&#xFF0C;&#x56E0;&#x4E3A; Object.getPrototypeOf(o) === C.prototype
  216. o instanceof C;
  217. // false&#xFF0C;&#x56E0;&#x4E3A; D.prototype&#x4E0D;&#x5728;o&#x7684;&#x539F;&#x578B;&#x94FE;&#x4E0A;
  218. o instanceof D;
  219. o instanceof Object; // true,&#x56E0;&#x4E3A;Object.prototype.isPrototypeOf(o)&#x8FD4;&#x56DE;true
  220. C.prototype instanceof Object // true,&#x540C;&#x4E0A;
  221. C.prototype = {};
  222. var o2 = new C();
  223. o2 instanceof C; // true
  224. o instanceof C; // false,C.prototype&#x6307;&#x5411;&#x4E86;&#x4E00;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;,&#x8FD9;&#x4E2A;&#x7A7A;&#x5BF9;&#x8C61;&#x4E0D;&#x5728;o&#x7684;&#x539F;&#x578B;&#x94FE;&#x4E0A;.
  225. D.prototype = new C(); // &#x7EE7;&#x627F;
  226. var o3 = new D();
  227. o3 instanceof D; // true
  228. o3 instanceof C; // true
  229. </code></pre><blockquote>
  230. <p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x5982;&#x679C;&#x8868;&#x8FBE;&#x5F0F; obj instanceof Foo &#x8FD4;&#x56DE;true&#xFF0C;&#x5219;&#x5E76;&#x4E0D;&#x610F;&#x5473;&#x7740;&#x8BE5;&#x8868;&#x8FBE;&#x5F0F;&#x4F1A;&#x6C38;&#x8FDC;&#x8FD4;&#x56DE;true&#xFF0C;&#x56E0;&#x4E3A;Foo.prototype&#x5C5E;&#x6027;&#x7684;&#x503C;&#x6709;&#x53EF;&#x80FD;&#x4F1A;&#x6539;&#x53D8;&#xFF0C;&#x6539;&#x53D8;&#x4E4B;&#x540E;&#x7684;&#x503C;&#x5F88;&#x6709;&#x53EF;&#x80FD;&#x4E0D;&#x5B58;&#x5728;&#x4E8E;obj&#x7684;&#x539F;&#x578B;&#x94FE;&#x4E0A;&#xFF0C;&#x8FD9;&#x65F6;&#x539F;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x503C;&#x5C31;&#x4F1A;&#x6210;&#x4E3A;false&#x3002;&#x53E6;&#x5916;&#x4E00;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x539F;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x503C;&#x4E5F;&#x4F1A;&#x6539;&#x53D8;&#xFF0C;&#x5C31;&#x662F;&#x6539;&#x53D8;&#x5BF9;&#x8C61;obj&#x7684;&#x539F;&#x578B;&#x94FE;&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x867D;&#x7136;&#x5728;&#x76EE;&#x524D;&#x7684;ES&#x89C4;&#x8303;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x80FD;&#x8BFB;&#x53D6;&#x5BF9;&#x8C61;&#x7684;&#x539F;&#x578B;&#x800C;&#x4E0D;&#x80FD;&#x6539;&#x53D8;&#x5B83;&#xFF0C;&#x4F46;&#x501F;&#x52A9;&#x4E8E;&#x975E;&#x6807;&#x51C6;&#x7684;<strong>proto</strong>&#x9B54;&#x6CD5;&#x5C5E;&#x6027;&#xFF0C;&#x662F;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x7684;&#x3002;&#x6BD4;&#x5982;&#x6267;&#x884C;obj.<strong>proto</strong> = {}&#x4E4B;&#x540E;&#xFF0C;obj instanceof Foo&#x5C31;&#x4F1A;&#x8FD4;&#x56DE;false&#x4E86;&#x3002;</p>
  231. </blockquote>
  232. <p>instanceof&#x548C;&#x591A;&#x5168;&#x5C40;&#x5BF9;&#x8C61;(&#x591A;&#x4E2A;frame&#x6216;&#x591A;&#x4E2A;window&#x4E4B;&#x95F4;&#x7684;&#x4EA4;&#x4E92;)</p>
  233. <blockquote>
  234. <p>&#x5728;&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x7684;&#x811A;&#x672C;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x5728;&#x591A;&#x4E2A;&#x7A97;&#x53E3;&#x4E4B;&#x95F4;&#x8FDB;&#x884C;&#x4EA4;&#x4E92;&#x3002;&#x591A;&#x4E2A;&#x7A97;&#x53E3;&#x610F;&#x5473;&#x7740;&#x591A;&#x4E2A;&#x5168;&#x5C40;&#x73AF;&#x5883;&#xFF0C;&#x4E0D;&#x540C;&#x7684;&#x5168;&#x5C40;&#x73AF;&#x5883;&#x62E5;&#x6709;&#x4E0D;&#x540C;&#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#xFF0C;&#x4ECE;&#x800C;&#x62E5;&#x6709;&#x4E0D;&#x540C;&#x7684;&#x5185;&#x7F6E;&#x7C7B;&#x578B;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;&#x8FD9;&#x53EF;&#x80FD;&#x4F1A;&#x5F15;&#x53D1;&#x4E00;&#x4E9B;&#x95EE;&#x9898;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x8868;&#x8FBE;&#x5F0F; [] instanceof window.frames[0].Array &#x4F1A;&#x8FD4;&#x56DE;false&#xFF0C;&#x56E0;&#x4E3A; Array.prototype !== window.frames[0].Array.prototype&#xFF0C;&#x56E0;&#x6B64;&#x4F60;&#x5FC5;&#x987B;&#x4F7F;&#x7528; Array.isArray(myObj) &#x6216;&#x8005; Object.prototype.toString.call(myObj) === &quot;[object Array]&quot;&#x6765;&#x5224;&#x65AD;myObj&#x662F;&#x5426;&#x662F;&#x6570;&#x7EC4;&#x3002;</p>
  235. </blockquote>
  236. <h2 id="&#x4F8B;&#x5B50;">&#x4F8B;&#x5B50;</h2>
  237. <p>&#x4F8B;&#x5B50;: &#x8868;&#x660E;String&#x5BF9;&#x8C61;&#x548C;Date&#x5BF9;&#x8C61;&#x90FD;&#x5C5E;&#x4E8E;Object&#x7C7B;&#x578B;</p>
  238. <blockquote>
  239. <p>&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x4F7F;&#x7528;&#x4E86;instanceof&#x6765;&#x8BC1;&#x660E;&#xFF1A;String&#x548C;Date&#x5BF9;&#x8C61;&#x540C;&#x65F6;&#x4E5F;&#x5C5E;&#x4E8E;Object&#x7C7B;&#x578B;&#x3002;</p>
  240. </blockquote>
  241. <pre><code>var simpleStr = &quot;This is a simple string&quot;;
  242. var myString = new String();
  243. var newStr = new String(&quot;String created with constructor&quot;);
  244. var myDate = new Date();
  245. var myObj = {};
  246. simpleStr instanceof String; // returns false, &#x68C0;&#x67E5;&#x539F;&#x578B;&#x94FE;&#x4F1A;&#x627E;&#x5230; undefined
  247. myString instanceof String; // returns true
  248. newStr instanceof String; // returns true
  249. myString instanceof Object; // returns true
  250. myObj instanceof Object; // returns true, despite an undefined prototype
  251. ({}) instanceof Object; // returns true, &#x540C;&#x4E0A;
  252. myString instanceof Date; // returns false
  253. myDate instanceof Date; // returns true
  254. myDate instanceof Object; // returns true
  255. myDate instanceof String; // returns false
  256. </code></pre><p>&#x6F14;&#x793A;mycar&#x5C5E;&#x4E8E;Car&#x7C7B;&#x578B;&#x7684;&#x540C;&#x65F6;&#x53C8;&#x5C5E;&#x4E8E;Object&#x7C7B;&#x578B;</p>
  257. <blockquote>
  258. <p>&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x521B;&#x5EFA;&#x4E86;&#x4E00;&#x4E2A;&#x7C7B;&#x578B;Car&#xFF0C;&#x4EE5;&#x53CA;&#x8BE5;&#x7C7B;&#x578B;&#x7684;&#x5BF9;&#x8C61;&#x5B9E;&#x4F8B;mycar. instanceof&#x8FD0;&#x7B97;&#x7B26;&#x8868;&#x660E;&#x4E86;&#x8FD9;&#x4E2A;mycar&#x5BF9;&#x8C61;&#x65E2;&#x5C5E;&#x4E8E;Car&#x7C7B;&#x578B;&#xFF0C;&#x53C8;&#x5C5E;&#x4E8E;Object&#x7C7B;&#x578B;&#x3002;</p>
  259. </blockquote>
  260. <pre><code>function Car(make, model, year) {
  261. this.make = make;
  262. this.model = model;
  263. this.year = year;
  264. }
  265. var mycar = new Car(&quot;Honda&quot;, &quot;Accord&quot;, 1998);
  266. var a = mycar instanceof Car; // &#x8FD4;&#x56DE; true
  267. var b = mycar instanceof Object; // &#x8FD4;&#x56DE; true
  268. </code></pre><h3 id="instanceof&#x8FD0;&#x7B97;&#x7B26;&#x5728;&#x6570;&#x7EC4;&#x4E2D;&#x7684;&#x4F7F;&#x7528;">instanceof&#x8FD0;&#x7B97;&#x7B26;&#x5728;&#x6570;&#x7EC4;&#x4E2D;&#x7684;&#x4F7F;&#x7528;</h3>
  269. <p>&#x786E;&#x5B9A;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5728;&#x5168;&#x5C40;&#x4E2D;&#x662F;&#x5426;&#x4E3A;&#x6570;&#x7EC4;</p>
  270. <pre><code class="lang-js"><span class="hljs-keyword">var</span> colors=[<span class="hljs-string">&apos;aa&apos;</span>,<span class="hljs-string">&apos;bb&apos;</span>,<span class="hljs-string">&apos;cc&apos;</span>];<span class="hljs-comment">//&#x521B;&#x5EFA;&#x5305;&#x542B;&#x4E09;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x6570;&#x7EC4;</span>
  271. <span class="hljs-keyword">if</span> (colors <span class="hljs-keyword">instanceof</span> <span class="hljs-built_in">Array</span>){
  272. alert(<span class="hljs-number">1</span>)
  273. }<span class="hljs-keyword">else</span> {
  274. alert(<span class="hljs-number">0</span>)
  275. }
  276. <span class="hljs-comment">//&#x6700;&#x540E;&#x8F93;&#x51FA; 1&#xFF0C;&#x8BF4;&#x660E;&#x8BE5;&#x5BF9;&#x8C61;&#x4E3A;&#x6570;&#x7EC4;</span>
  277. </code></pre>
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