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ClassList对象、表单事件
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ClassList对象

效果图

代码

  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>class: 用js控制</title>
  8.     <style>
  9.       .title {
  10.         border: 1px solid black;
  11.         background-color: aquamarine;
  12.         color: red;
  13.       }
  15.       .active {
  16.         color: blueviolet;
  17.       }
  19.       .bgc {
  20.         background-color: chartreuse;
  21.       }
  23.       .em {
  24.         color: darkolivegreen;
  25.       }
  26.       .bgc2 {
  27.         background-color: antiquewhite;
  28.       }
  29.     </style>
  30.   </head>
  31.   <body>
  32.     <h2 class="title">hello</h2>
  34.     <script>
  35.       const h2 = document.querySelector('.title');
  37.       //add()添加
  38.       h2.classList.add('active');
  39.       h2.classList.add('bgc');
  41.       //contains()判断
  42.       console.log(h2.classList.contains('active'));
  43.       console.log(h2.classList.contains('你好'));
  45.       //remove()移除
  46.       h2.classList.remove('bgc');
  48.       //replace()替换
  49.       h2.classList.replace('active', 'em');
  51.       //toggle(): 动态切换class
  52.       //如果之前没这个样式，就加上，如果有，就去掉
  53.       h2.classList.toggle('bgc2');
  54.     </script>
  55.   </body>
  56. </html>

表单事件

效果图

代码

  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>表单事件</title>
  8.     <link rel="stylesheet" href="css/2.css" />
  9.   </head>
  10.   <body>
  11.     <form action="" method="post" id="login">
  12.       <label class="title">用户登录</label>
  13.       <label for="email">邮箱：</label>
  14.       <input type="email" id="email" name="email" value="" autofocus />
  15.       <label for="password">密码：</label>
  16.       <input type="password" id="password" name="password" />
  17.       <button name="submit" onclick="check(this)">登录</button>
  18.     </form>
  20.     <script>
  21.       function check(ele) {
  22.         //禁用默认行为
  23.         event.preventDefault();
  24.         //防止冒泡
  25.         event.stopPropagation();
  26.         //非空验证
  27.         // 每一个表单控件input,都有一个form属性,指向所属的表单元素
  28.         console.log(ele.form);
  30.         let email = ele.form.email;
  31.         let password = ele.form.password;
  32.         if (email.value.length === 0) {
  33.           alert('邮箱不能为空');
  34.           email.focus();
  35.           return false;
  36.         } else if (password.value.length === 0) {
  37.           alert('密码不能为空');
  38.           email.focus();
  39.           return false;
  40.         } else {
  41.           alert('验证成功');
  42.         }
  43.       }
  44.       document.forms.login.email.onblur = function () {
  45.         if (this.value.length === 0) {
  46.           alert('邮箱不能为空');
  47.           return false;
  48.         }
  49.       };
  51.       document.forms.login.password.onblur = function () {
  52.         if (this.value.length === 0) {
  53.           alert('密码不能为空');
  54.           return false;
  55.         }
  56.       };
  57.     </script>
  58.   </body>
  59. </html>

css

  1. body {
  2.   /* background-color: aqua; */
  3.   background-image: url(https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg.jj20.com%2Fup%2Fallimg%2Ftp08%2F01042323313046.jpg&refer=http%3A%2F%2Fimg.jj20.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1651903778&t=a6d0d4182431e70824110551caa00dd6);
  4.   image-rendering: repeat - x;
  5.   color: #444;
  6.   font-weight: lighter;
  7. }
  9. #login {
  10.   width: 20em;
  11.   border-radius: 00.3em;
  12.   box-shadow: 0 0 1em;
  13.   box-sizing: border-box;
  14.   padding: 1em 2em 1em;
  15.   margin: 5em auto;
  16.   background-color: aquamarine;
  17.   display: grid;
  18.   grid-template-columns: 3em 1fr;
  19.   gap: 1em 0;
  20. }
  22. #login .title {
  23.   grid-area: auto / span 2;
  24.   place-self: center;
  25. }
  27. #login .input {
  28.   border-radius: 0.3em;
  29.   border: none;
  30.   padding-left: 0.3em;
  31. }
  33. #login input:focus {
  34.   outline: none;
  35.   box-shadow: 0 0 5px seagreen;
  36.   background-color: hsl(283, 100%, 95%);
  37. }
  39. #login button {
  40.   grid-area: auto / 2 / auto;
  41.   outline: none;
  42.   background-color: lightseagreen;
  43.   border: none;
  44.   color: aliceblue;
  45. }
  47. #login button:hover {
  48.   cursor: pointer;
  49.   background-color: seagreen;
  50.   transition: 0.5s;
  51. }
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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