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64 lines
4.8 KiB
HTML
64 lines
4.8 KiB
HTML
<article class="" id="post-">
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<h1 class="entry-title">callbacks.empty()</h1>
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所属分类：<span class="category"><a href="/category/callbacks-object/">回调对象</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/callbacks.empty/" target="_blank">callbacks.empty()</a></span>
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<article class="entry method" id="callbacks-empty1"><h2 class="section-title">
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<span class="name">callbacks.empty()</span><span class="returns">返回: <a href="/Types/#Callbacks">Callbacks</a></span>
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</h2>
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<p class="desc"><strong>描述: </strong>从列表中删除所有的回调.</p>
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<ul class="signatures"><li class="signature" id="callbacks-empty">
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<h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.7/">1.7</a></span>callbacks.empty()</h4>
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<ul><li><div class="null-signature">这个方法不接受任何参数</div></li></ul>
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</li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p>此方法返回绑定它的那个回调对象(<code>this</code>).</p>
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<h2 id="example-1">Example</h2>
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<p>用<code>callbacks.empty()</code>清空一个回调的列表:</p>
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<pre><div class="container"><div class="line"><code><span class="comment">// a sample logging function to be added to a callbacks list</span></code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> foo = <span class="keyword">function</span>( value1, value2 ) {</code></div></div><div class="container"><div class="line"><code> console.log( <span class="string">"foo: "</span> + value1 + <span class="string">","</span> + value2 );</code></div></div><div class="container"><div class="line"><code>}</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="comment">// another function to also be added to the list</span></code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> bar = <span class="keyword">function</span>( value1, value2 ){</code></div></div><div class="container"><div class="line"><code> console.log( <span class="string">"bar: "</span> + value1 + <span class="string">","</span> + value2 );</code></div></div><div class="container"><div class="line"><code>}</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> callbacks = $.Callbacks();</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="comment">// add the two functions</span></code></div></div><div class="container"><div class="line"><code>callbacks.add( foo );</code></div></div><div class="container"><div class="line"><code>callbacks.add( bar );</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="comment">// empty the callbacks list</span></code></div></div><div class="container"><div class="line"><code>callbacks.empty();</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="comment">// check to ensure all callbacks have been removed</span></code></div></div><div class="container"><div class="line"><code>console.log( callbacks.has( foo ) );</code></div></div><div class="container"><div class="line"><code><span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>console.log( callbacks.has( bar ) );</code></div></div><div class="container"><div class="line"><code><span class="comment">// false</span></code></div></div></pre>
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