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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
commit310fd066e91f454b990372ffa30e803cc8120975 (patch)
treed5d900deb656a5da18e0b60d00f0db73f3a2e88e /files/zh-cn/web/javascript/reference/global_objects/proxy/handler/deleteproperty
parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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----
-title: handler.deleteProperty()
-slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/deleteProperty
-translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/deleteProperty
----
-<div>{{JSRef}}</div>
-
-<p><strong><code>handler.deleteProperty()</code></strong> 方法用于拦截对对象属性的 {{jsxref("Operators/delete", "delete")}} 操作。</p>
-
-<h2 id="语法">语法</h2>
-
-<pre class="brush: js">var p = new Proxy(target, {
- deleteProperty: function(target, property) {
- }
-});
-</pre>
-
-<h3 id="参数">参数</h3>
-
-<p><code>deleteProperty</code> 方法将会接受以下参数。 <code>this</code> 被绑定在 handler上。</p>
-
-<dl>
- <dt><code>target</code></dt>
- <dd>目标对象。</dd>
- <dt><code>property</code></dt>
- <dd>待删除的属性名。</dd>
-</dl>
-
-<h3 id="返回值">返回值</h3>
-
-<p><code>deleteProperty</code> 必须返回一个 {{jsxref("Boolean")}} 类型的值,表示了该属性是否被成功删除。</p>
-
-<h2 id="描述">描述</h2>
-
-<p><code><strong>handler.deleteProperty()</strong></code> 方法可以拦截 {{jsxref("Operators/delete", "delete")}} 操作。</p>
-
-<h3 id="拦截">拦截</h3>
-
-<p>该方法会拦截以下操作:</p>
-
-<ul>
- <li>删除属性: <code>delete proxy[foo]</code> 和 <code>delete proxy.foo</code></li>
- <li>{{jsxref("Reflect.deleteProperty()")}}</li>
-</ul>
-
-<h3 id="不变量">不变量</h3>
-
-<p>如果违背了以下不变量,proxy 将会抛出一个 {{jsxref("TypeError")}}:</p>
-
-<ul>
- <li>如果目标对象的属性是不可配置的,那么该属性不能被删除。</li>
-</ul>
-
-<h2 id="示例">示例</h2>
-
-<p>以下代码演示了对 {{jsxref("Operators/delete", "delete")}} 操作的拦截。</p>
-
-<pre class="brush: js">var p = new Proxy({}, {
- deleteProperty: function(target, prop) {
- console.log('called: ' + prop);
- return true;
- }
-});
-
-delete p.a; // "called: a"
-</pre>
-
-<h2 id="规范">规范</h2>
-
-<table class="standard-table">
- <tbody>
- <tr>
- <th scope="col">Specification</th>
- <th scope="col">Status</th>
- <th scope="col">Comment</th>
- </tr>
- <tr>
- <td>{{SpecName('ES2015', '#sec-proxy-object-internal-methods-and-internal-slots-delete-p', '[[Delete]]')}}</td>
- <td>{{Spec2('ES2015')}}</td>
- <td>Initial definition.</td>
- </tr>
- <tr>
- <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-delete-p', '[[Delete]]')}}</td>
- <td>{{Spec2('ESDraft')}}</td>
- <td> </td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<div>{{CompatibilityTable}}</div>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</th>
- <th>Chrome</th>
- <th>Firefox (Gecko)</th>
- <th>Internet Explorer</th>
- <th>Opera</th>
- <th>Safari</th>
- </tr>
- <tr>
- <td>Basic support</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatGeckoDesktop("18")}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
- <tr>
- <th>Feature</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>Basic support</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatGeckoMobile("18")}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- <td>{{CompatUnknown}}</td>
- </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="另见">另见</h2>
-
-<ul>
- <li>{{jsxref("Proxy")}}</li>
- <li>{{jsxref("Proxy.handler", "handler")}}</li>
- <li>{{jsxref("Operators/delete", "delete")}} 操作符</li>
- <li>{{jsxref("Reflect.deleteProperty()")}}</li>
-</ul>