<div id="clickdemo">
  <ul>
    <li>1<li>
  </ul>
</div>

 $("#clickdemo ul li").on("click",function(){
    alert("點選了");
    });

<div id="clickdemo">
  <ul>

  </ul>
</div>

$("#clickdemo ul").on("click","li", function() {
     alert("點選了");
 });
 

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