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callbacks.has.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>callbacks.has(callback) | jQuery API 中文手册</title>
<meta name="author" content="jQuery 中文手册 - hemin.cn/jq/">
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</head>
<body id="split">
<div id="content" class="a2">
<div rel="callbacks.has">
<h2><span>返回值:Boolean</span>callbacks.has(callback)</h2>
<h3>概述</h3>
<div class="desc">
<p> 确定是否提供的回调列表 </p>
<div class="longdesc">
<p></p>
</div>
</div>
<h3>参数</h3>
<div class="parameter">
<h4><strong>callback</strong><em>V1.7</em></h4>
<p> 用来搜索的回调。 </p>
</div>
<div class="example">
<h3>示例</h3>
<span id="f_ad2"></span>
<h4>描述:</h4>
<p> 用 callbacks.has() 检查是否回调列表中包含一个特定的回调: </p>
<h5>jQuery 代码:</h5>
<pre><code>// a sample logging function to be added to a callbacks list
var foo = function( value1, value2 ){
console.log( 'Received:' + value1 + ',' + value2 );
}
// a second function which will not be added to the list
var bar = function( value1, value2 ){
console.log( 'foobar');
}
var callbacks = $.Callbacks();
// add the log method to the callbacks list
callbacks.add( foo );
// determine which callbacks are in the list
console.log( callbacks.has( foo ) ); // true
console.log( callbacks.has( bar ) ); // false</code></pre>
</div>
</div>
</div>
</body>
</html>