更改选择的值事件不适用于<select>

asi*_*sim 0 html javascript jquery

当下拉列表的选定值发生变化时,以下代码不起作用.如果有任何错误请更正.

<!doctype html>
  <html lang="en">
    <head>
      <meta charset="utf-8">

      <script src="jquery-1.9.1.js"></script>
      <script type="text/javascript">

        $(document).ready(function(){
          ("#theSelect").change(function(){
            alert("a");
          });
        });

      </script>

    </head>

  <body>
    <select id="theSelect">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
  </body>
</html>
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Mus*_*usa 7

你错过了$之前("#theSelect")

$("#theSelect").change(function(){
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