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[JavaScript] JS代码控制多行列表框是否可以多选 →→→→→进入此内容的聊天室

来自 , 2020-11-02, 写在 JavaScript, 查看 110 次.
URL http://www.code666.cn/view/8d1f1aac
  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <script>
  5. function selectMultiple()
  6. {
  7. document.getElementById("mySelect").multiple=true;
  8. }
  9. </script>
  10. </head>
  11. <body>
  12.  
  13. <form>
  14. <select id="mySelect" size="4">
  15.         <option>Apple</option>
  16.         <option>Pear</option>
  17.         <option>Banana</option>
  18.         <option>Orange</option>
  19. </select>
  20. <input type="button" onclick="selectMultiple()" value="Select multiple">
  21. </form>
  22. <p>Before you click on the "Select multiple" button, try to select more than one option (by holding down the Shift or Ctrl key). Then click on the "Select multiple" button and try again.</p>
  23.  
  24. </body>
  25. </html>
  26.  
  27. //javascript/7977

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