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禁用表单的三种方式
          
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  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8">
  5. <meta name="viewport"
  6. content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  7. <meta http-equiv="X-UA-Compatible" content="ie=edge">
  8. <title>1109作业</title>
  9. <!-- 作业内容:-->
  10. <!-- 1. 实例演示禁用表单默认提交的三种方式-->
  11. <!-- 2. 实例演示this.target,currentTarget的区别与联系-->
  12. <!-- 3. (选做) 用JS实现表单中的邮箱和密码的验证(除了非空验证)-->
  13. <style>
  14. .a1,button {margin-left: 100px}
  15. form{
  16. margin: 15px 15px
  17. }
  18. div{padding: 8px}
  19. p{color: #55a532}
  20. </style>
  21. </head>
  22. <body>
  23. <!--禁用:onsubmit=" return false"-->
  24. <form action="a.php" method="post" id="login1" >
  25. <label class="a1">用户登陆</label><br>
  26. <label for="phone" >手机号: <input type="text" id="phone"></label>
  27. <div><label for="pwd" >密码:<input type="text" id="pwd"></label></div>
  28. <button name="submit">提交</button>
  29. </form>
  30. <h4>1. 禁用表单默认提交的三种方式</h4>
  31. <ul>
  32. <li>form处加 onsubmit=" return false"</li>
  33. <li>通过JS事件event.preventDefault()禁用</li>
  34. <li>修改button提交按钮的type属性,默认为type="submit",改为type="button"</li>
  35. </ul>
  36. <hr>
  37. <h4>2. 实例演示this.target,currentTarget的区别与联系</h4>
  38. <p>如果不存在事件委托,不需要利用事件冒泡的话:</p><p>事件主体和事件绑定是二合一的状态:ev.target === ev.currentTarget</p>
  39. <p>事件绑定主体:ev.currentTarge</p>
  40. <p>事件"触发"主体: 用户实际点击的元素:ev.target</p>
  41. <script>
  42. // 通过js禁用表单默认提交
  43. // submit 是button name的值
  44. document.forms.login1.submit.onclick = function (ev) {
  45. console.log(ev);
  46. ev.preventDefault()
  47. console.log('已禁用表单默认提交!')
  48. }
  49. </script>
  50. </body>
  51. </html>

执行结果:

Correcting teacher:PHPzPHPz

Correction status:qualified

Teacher's comments:
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