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113 lines
11 KiB
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<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>Array<strong>.unobserve()方法用来移除</strong><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>设置的所有观察者。</p>
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<h2 id="语法">语法</h2>
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<pre><code class="language-javascript"><code>Array.unobserve(<var>arr</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>arr</code></dt>
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<dd>停止观察的数组。</dd>
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<dt> </dt>
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<dt><code>callback回调</code></dt>
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<dd>需要停止的array <strong>arr</strong>每次改变都会调用的函数引用。</dd>
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</dl>
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<h2 id="描述">描述</h2>
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<p><code>Array.unobserve()</code> 方法因为要移除观察者，所以应该在<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>调用后调用。</p>
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<p>回调函数应该是一个函数的引用并且不能是匿名函数， 因为这个函数需要用来移除前面的观察者， 如果用匿名函数是没有用的，将不能移除任何观察者。</p>
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<h2 id="例子">例子</h2>
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<h3 id="停止观察一个数组">停止观察一个数组</h3>
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<pre><code class="language-javascript">var arr = [1, 2, 3];
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var observer = function(changes) {
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console.log(changes);
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}
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Array.observe(arr, observer);
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arr.push(4);
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// [{type: "splice", object: <arr>, index: 3, removed:[], addedCount: 1}]
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Array.unobserve(arr, observer);
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arr.pop();
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// The callback wasn't called</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 persons = ['Khalid', 'Ahmed', 'Mohammed'];
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Array.observe(persons, function (changes) {
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console.log(changes);
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});
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persons.shift();
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// [{type: "splice", object: <arr>, index: 0, removed: [ "Khalid" ], addedCount: 0 }]
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Array.unobserve(persons, function (changes) {
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console.log(changes);
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});
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persons.push('Abdullah');
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// [{type: "splice", object: <arr>, index: 2, removed: [], addedCount: 1 }]
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// The callback will always be called
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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>
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<div>
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<div class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
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<p></p><div class="bc-data"><a class="bc-github-link external" href="https://github.com/mdn/browser-compat-data" rel="noopener">Update compatibility data on GitHub</a><table class="bc-table bc-table-js"><thead><tr class="bc-platforms"><td></td><th class="bc-platform-desktop" colspan="6"><span>Desktop</span></th><th class="bc-platform-mobile" colspan="7"><span>Mobile</span></th><th class="bc-platform-server" colspan="1"><span>Server</span></th></tr><tr class="bc-browsers"><td></td><th class="bc-browser-chrome"><span class="bc-head-txt-label bc-head-icon-chrome">Chrome</span></th><th class="bc-browser-edge"><span class="bc-head-txt-label bc-head-icon-edge">Edge</span></th><th class="bc-browser-firefox"><span class="bc-head-txt-label bc-head-icon-firefox">Firefox</span></th><th class="bc-browser-ie"><span class="bc-head-txt-label bc-head-icon-ie">Internet Explorer</span></th><th class="bc-browser-opera"><span class="bc-head-txt-label bc-head-icon-opera">Opera</span></th><th class="bc-browser-safari"><span class="bc-head-txt-label bc-head-icon-safari">Safari</span></th><th class="bc-browser-webview_android"><span class="bc-head-txt-label bc-head-icon-webview_android">Android webview</span></th><th class="bc-browser-chrome_android"><span class="bc-head-txt-label bc-head-icon-chrome_android">Chrome for Android</span></th><th class="bc-browser-edge_mobile"><span class="bc-head-txt-label bc-head-icon-edge_mobile">Edge Mobile</span></th><th class="bc-browser-firefox_android"><span class="bc-head-txt-label bc-head-icon-firefox_android">Firefox for Android</span></th><th class="bc-browser-opera_android"><span class="bc-head-txt-label bc-head-icon-opera_android">Opera for Android</span></th><th class="bc-browser-safari_ios"><span class="bc-head-txt-label bc-head-icon-safari_ios">Safari on iOS</span></th><th class="bc-browser-samsunginternet_android"><span class="bc-head-txt-label bc-head-icon-samsunginternet_android">Samsung Internet</span></th><th class="bc-browser-nodejs"><span class="bc-head-txt-label bc-head-icon-nodejs">Node.js</span></th></tr></thead><tbody><tr><th scope="row"><code>unobserve</code> <div class="bc-icons"><abbr class="only-icon" title="Deprecated. Not for use in new websites."><span>Deprecated</span><i class="ic-deprecated"></i></abbr><abbr class="only-icon" title="Non-standard. Expect poor cross-browser support."><span>Non-standard</span><i class="ic-non-standard"></i></abbr></div></th><td class="bc-supports-no bc-browser-chrome"><span class="bc-browser-name">Chrome</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>36 — 52</td><td class="bc-supports-no bc-browser-edge"><span class="bc-browser-name">Edge</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-firefox"><span class="bc-browser-name">Firefox</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-ie"><span class="bc-browser-name">IE</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-opera"><span class="bc-browser-name">Opera</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-safari"><span class="bc-browser-name">Safari</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-webview_android"><span class="bc-browser-name">WebView Android</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-chrome_android"><span class="bc-browser-name">Chrome Android</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-edge_mobile"><span class="bc-browser-name">Edge Mobile</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-firefox_android"><span class="bc-browser-name">Firefox Android</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-opera_android"><span class="bc-browser-name">Opera Android</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-safari_ios"><span class="bc-browser-name">Safari iOS</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-samsunginternet_android"><span class="bc-browser-name">Samsung Internet Android</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-no bc-browser-nodejs"><span class="bc-browser-name">nodejs</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td></tr></tbody></table><section class="bc-legend" id="sect1"><h3 class="offscreen" id="Legend">Legend</h3><dl><dt><span class="bc-supports-no bc-supports">
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<abbr class="bc-level bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr></span></dt><dd>No support</dd><dt><abbr class="only-icon" title="Non-standard. Expect poor cross-browser support."><span>Non-standard. Expect poor cross-browser support.</span><i class="ic-non-standard"></i></abbr></dt><dd>Non-standard. Expect poor cross-browser support.</dd><dt><abbr class="only-icon" title="Deprecated. Not for use in new websites."><span>Deprecated. Not for use in new websites.</span><i class="ic-deprecated"></i></abbr></dt><dd>Deprecated. Not for use in new websites.</dd></dl></section></div><p></p>
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</div>
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</div>
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<h2 id="相关内容">相关内容</h2>
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<ul>
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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/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/Object/unobserve" title="Object.unobserve() 是用来移除通过 Object.observe()设置的观察者的方法。"><code>Object.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> |