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124 lines
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124 lines
6.0 KiB
HTML
<article id="wikiArticle">
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<div> <div class="blockIndicator nonStandard nonStandardHeader">
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<p><strong><span class="icon-only-inline" title="This API has not been standardized."><i class="icon-warning-sign"> </i></span> 非标准</strong><br/>
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该特性是非标准的，请尽量不要在生产环境中使用它！</p>
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</div></div>
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<p><strong>Object.unobserve()</strong> 是用来移除通过 <a href="Reference/Global_Objects/Object/observe" title="Object.observe() 方法用于异步地监视一个对象的修改。当对象属性被修改时，方法的回调函数会提供一个有序的修改流。然而，这个接口已经被废弃并从各浏览器中移除。你可以使用更通用的 Proxy 对象替代。"><code>Object.observe()</code></a>设置的观察者的方法。</p>
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<h2 id="语法">语法</h2>
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<pre><code class="language-javascript"><code>Object.unobserve(<var>obj</var>, <var>callback</var>)</code></code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt><code>obj</code></dt>
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<dd>需要停止观察的对象。</dd>
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<dt><code>callback</code></dt>
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<dd>通过 observer 给 <strong>obj </strong>对象设置的回调函数.</dd>
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</dl>
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<h2 id="描述">描述</h2>
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<p><code>Object.unobserve()</code> 用来在 <a href="Reference/Global_Objects/Object/observe" title="Object.observe() 方法用于异步地监视一个对象的修改。当对象属性被修改时，方法的回调函数会提供一个有序的修改流。然而，这个接口已经被废弃并从各浏览器中移除。你可以使用更通用的 Proxy 对象替代。"><code>Object.observe()</code></a> 被调用以后，从对象上移除一个观察者。</p>
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<p>这个回调函数必须是一个函数的引用，而不能是一个匿名函数。因为这个引用将被用来移除之前设置的观察者方法。 给 <strong>Object.unobserve() </strong>传入匿名函数作为回调是不起作用的， 它不能移除任何观察者方法。</p>
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<h2 id="例子">例子</h2>
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<h3 id="观察一个对象">观察一个对象</h3>
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<pre><code class="language-javascript">var obj = {
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foo: 0,
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bar: 1
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};
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var observer = function(changes) {
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console.log(changes);
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}
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Object.observe(obj, observer);
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obj.newProperty = 2;
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// [{name: 'newProperty', object: <obj>, type: 'add'}]
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Object.unobserve(obj, observer);
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obj.foo = 1;
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// 回调函数不会被调用</code></pre>
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<h3 id="使用匿名函数">使用匿名函数</h3>
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<pre><code class="language-javascript">var person = {
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name : 'Ahmed',
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age : 25
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};
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Object.observe(person, function (changes) {
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console.log(changes);
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});
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person.age = 40;
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// [{name: 'age', object: <obj>, oldValue: 25, type: 'update'}]
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Object.unobserve(person, function (changes) {
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console.log(changes);
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});
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person.age = 63;
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// [{name: 'age', object: <obj>, oldValue: 40, type: 'update'}]
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// 回调函数将会被调用
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</code></pre>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<div><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
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This compatibility table still uses the old format,
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because we haven't yet converted the data it contains.
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<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
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<div class="htab">
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<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
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<ul>
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<li class="selected"><a>Desktop</a></li>
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<li><a>Mobile</a></li>
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</ul>
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</div></div>
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<div id="compat-desktop">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Chrome</th>
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<th>Firefox (Gecko)</th>
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<th>Internet Explorer</th>
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<th>Opera</th>
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<th>Safari</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td>36</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>23</td>
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<td><span style="color: #f00;">未实现</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<div id="compat-mobile">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Android</th>
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<th>Chrome for Android</th>
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<th>Firefox Mobile (Gecko)</th>
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<th>IE Mobile</th>
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<th>Opera Mobile</th>
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<th>Safari Mobile</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>36</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>23</td>
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<td><span style="color: #f00;">未实现</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<h2 id="相关链接">相关链接</h2>
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<ul>
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<li><a href="Reference/Global_Objects/Object/observe" title="Object.observe() 方法用于异步地监视一个对象的修改。当对象属性被修改时，方法的回调函数会提供一个有序的修改流。然而，这个接口已经被废弃并从各浏览器中移除。你可以使用更通用的 Proxy 对象替代。"><code>Object.observe()</code></a> <span class="icon-only-inline" title="This API has not been standardized."><i class="icon-warning-sign"> </i></span></li>
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<li><a href="Reference/Global_Objects/Array/observe" title='Array.observe() 方法用于异步监视数组发生的变化，类似于针对对象的 Object.observe() 。当数组的值发生变化时，它按发生顺序提供了一个变化流。与 Object.observe() 类似，它由如下可接受的变化类型列表["add"、"update"、"delete"、"splice"]触发。'><code>Array.observe()</code></a> <span class="icon-only-inline" title="This API has not been standardized."><i class="icon-warning-sign"> </i></span></li>
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<li><a href="Reference/Global_Objects/Array/unobserve" title="Array.unobserve()方法用来移除Array.observe()设置的所有观察者。"><code>Array.unobserve()</code></a> <span class="icon-only-inline" title="This API has not been standardized."><i class="icon-warning-sign"> </i></span></li>
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</ul>
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</article> |