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classList对象、blur事件进行表单非空验证
Blackeye
Original
329 people have browsed it

hw

  1. <!DOCTYPE html>
  2. <html lang="en">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>classList对象、blur事件进行表单非空验证</title>
  8.     <link rel="stylesheet" href="style.css" />
  9.     <style>
  10.         .bg{
  11.             background-color: aqua;
  12.         }
  13.         .bgn{
  14.             background-color: coral;
  15.         }
  16.     </style>
  17.   </head>
  18.   <body>
  19.     <form action="" method="post" id="login">
  20.       <label class="title">用户登录</label>
  21.       <label for="email">邮箱:</label>
  22.       <input type="email" id="email" name="email" value="" autofocus />
  23.       <label for="password">密码:</label>
  24.       <input type="password" id="password" name="password" />
  25.       <!-- 1. type="button" 来表示这是一个普通按钮,没有提交行为 -->
  26.       <button name="submit" onclick="check(this)">登录</button>
  27.     </form>
  29.     <script>
  30.       // 1. 实例演示classList对象
  31.       document.body.classList.add("bg");
  32.       document.body.classList.remove("bg");
  33.       document.body.classList.toggle("bg");
  34.       document.body.classList.replace("bg","bgn");
  35.       document.body.classList.remove("bgn");
  37.       function check(ele){
  38.         event.preventDefault();
  39.         event.stopPropagation();
  40.         let email = ele.form.email;
  41.         let password = ele.form.password;
  42.         if(email.value.length === 0){
  43.             alert("邮箱不能为空");
  44.             email.focus();
  45.             return false;
  46.         }else if(password.value.length === 0){
  47.             alert("密码不能为空");
  48.             password.focus();
  49.             return false;
  50.         }else{
  51.             return true;
  52.         }
  53.       }
  54.       // 2. 使用blur事件进行表单非空验证
  55.       document.forms.login.email.onblur = function(){
  56.         if(this.value.length === 0){
  57.             alert("邮箱不能为空");
  58.             return false;
  59.         }
  60.       };
  61.       document.forms.login.password.onblur = function(){
  62.         if(this.value.length === 0){
  63.             alert("密码不能为空");
  64.             return false;
  65.         }
  66.       };
  67.     </script>
  68.   </body>
  69. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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