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authorMDN <actions@users.noreply.github.com>2021-07-17 00:35:32 +0000
committerMDN <actions@users.noreply.github.com>2021-07-17 00:35:32 +0000
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----
-title: Map.prototype.has()
-slug: Web/JavaScript/Reference/Global_Objects/Map/has
-translation_of: Web/JavaScript/Reference/Global_Objects/Map/has
-tags:
- - ECMAScript 2015
- - JavaScript
- - Map
- - Method
- - Prototype
- - Reference
-browser-compat: javascript.builtins.Map.has
----
-<div>{{JSRef}}</div>
-
-<p>方法<code><strong>has()</strong></code> 返回一个bool值,用来表明map 中是否存在指定元素.</p>
-
-<h2 id="语法">语法</h2>
-
-<pre class="syntaxbox"><code><em>myMap</em>.has(key);</code></pre>
-
-<h3 id="参数">参数</h3>
-
-<dl>
- <dt>key</dt>
- <dd>必填. 用来检测是否存在指定元素的键值.</dd>
-</dl>
-
-<h3 id="返回值">返回值</h3>
-
-<dl>
- <dt>Boolean</dt>
- <dd>如果指定元素存在于Map中,则返回true。其他情况返回false</dd>
-</dl>
-
-<h2 id="案例">案例</h2>
-
-<h3 id="使用has方法">使用has方法</h3>
-
-<pre class="brush: js">var myMap = new Map();
-myMap.set("bar", "foo");
-
-myMap.has("bar"); // returns true
-myMap.has("baz"); // returns false
-</pre>
-
-<h2 id="规范列表">规范列表</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">规范名称</th>
- <th scope="col">Status</th>
- <th scope="col">Comment</th>
- </tr>
- <tr>
- <td>{{SpecName('ES6', '#sec-map.prototype.has', 'Map.prototype.has')}}</td>
- <td>{{Spec2('ES6')}}</td>
- <td>Initial definition.</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<p>{{CompatibilityTable}}</p>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>浏览器</th>
- <th>Chrome谷歌</th>
- <th>Firefox (Gecko)火狐</th>
- <th>Internet Explorer</th>
- <th>Opera</th>
- <th>Safari</th>
- </tr>
- <tr>
- <td>兼容版本</td>
- <td>38</td>
- <td>{{CompatGeckoDesktop("13.0")}}</td>
- <td>11</td>
- <td>25</td>
- <td>7.1</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>浏览器</th>
- <th>Android</th>
- <th>Chrome for Android</th>
- <th>Firefox Mobile (Gecko)</th>
- <th>IE Mobile</th>
- <th>Opera Mobile</th>
- <th>Safari Mobile</th>
- </tr>
- <tr>
- <td>兼容版本</td>
- <td>{{CompatNo}}</td>
- <td>38</td>
- <td>{{CompatGeckoMobile("13.0")}}</td>
- <td>{{CompatNo}}</td>
- <td>{{CompatNo}}</td>
- <td>8</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="相关链接">相关链接</h2>
-
-<ul>
- <li>{{jsxref("Map")}}</li>
- <li>{{jsxref("Map.prototype.set()")}}</li>
- <li>{{jsxref("Map.prototype.get()")}}</li>
-</ul>