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Detailed explanation of delegate and undelegate instances in jQuery

黄舟Original: 2017-06-26 10:56:221360browse

Nothing to say, just look at the code!

Browser version: chrome 21

<body>

    <ul class="a-list">
        <li><a href="javascript:;">test1</a></li>
        <li><a href="javascript:;">test2</a></li>
        <li><a href="javascript:;">test3</a></li>
        <li><a href="javascript:;">test4</a></li>
        <li><a href="javascript:;">test5</a></li>
    </ul>

    <ul class="button-list">
        <li><button>test1</button></li>
        <li><button>test2</button></li>
        <li><button>test3</button></li>
        <li><button>test4</button></li>
        <li><button>test5</button></li>
    </ul>

</body>

1 //绑定
2 $(document).delegate(&#39;a&#39;, &#39;click&#39;, function()
3 {
4     alert($(this).html());
5 });

1 //不能取消
2 $(document).undelegate(&#39;a&#39;);
3 
4 //可以取消
5 $(document).undelegate(&#39;a&#39;, &#39;click&#39;);

1 //绑定
2 $(document).delegate(&#39;a, button&#39;, &#39;click&#39;, function()
3 {
4     alert($(this).html());
5 });

//不能取消
$(document).undelegate(&#39;a&#39;, &#39;click&#39;);

//不能取消
$(document).undelegate(&#39;button&#39;, &#39;click&#39;);

//可以取消
$(document).undelegate(&#39;a, button&#39;, &#39;click&#39;);

Note:

1 //不能取消 (与绑定时选择器内容不一致，顺序颠倒)
2 $(document).undelegate(&#39;button, a&#39;, &#39;click&#39;);
3 
4 //不能取消 (与绑定时选择器内容不一致，少了一个空格)
5 $(document).undelegate(&#39;a,button&#39;, &#39;click&#39;);

1 //绑定
2 $(document).delegate(&#39;a, button&#39;, &#39;click mouseover&#39;, function(e)
3 {
4     alert($(this).html());
5 });

//略过部分测试，同上

//不能取消
$(document).undelegate(&#39;a&#39;, &#39;mouseover&#39;);

//可以取消
$(document).undelegate(&#39;a, button&#39;, &#39;click&#39;);

//可以取消
$(document).undelegate(&#39;a, button&#39;, &#39;mouseover&#39;);

//可以取消
$(document).undelegate(&#39;a, button&#39;, &#39;mouseover click&#39;);

1 //绑定
2 $(&#39;.a-list&#39;).delegate(&#39;a&#39;, &#39;click mouseover&#39;, function()
3 {
4     alert($(this).html());
5 });

//略过部分测试，同上
    
//不能取消
$(document).undelegate(&#39;a&#39;, &#39;click&#39;);

//可以取消
$(&#39;.a-list&#39;).undelegate(&#39;a&#39;, &#39;click&#39;);

//可以取消
$(&#39;ul&#39;).undelegate(&#39;a&#39;, &#39;click&#39;);

//可以取消
$(&#39;ul&#39;).undelegate();

//可以取消
$(&#39;.a-list&#39;).undelegate();

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