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留言板案例
手机用户311660634
Original
318 people have browsed it
  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>留言板案例</title>
  8. </head>
  9. <body>
  10.     <style>
  11.         div {
  12.             width: 300px;
  13.             height: 500px;
  14.             border: 3px solid black;
  15.             display: grid;
  16.             grid-template-rows: 1fr 30px;
  17.             background-color: green;
  18.         }
  19.             div > input{
  20.                background-color: rgb(71, 37, 174);
  22.             }
  23.             li  {
  24.                 list-style: none;
  25.                 border: 1px solid red;
  26.                 margin: 5px;
  27.             }
  28.     </style>
  29.     <div>
  30.     <ul class="test">
  33.     </ul>
  35.     <input type="text" onkeydown="insertComment(this)" placeholder="请输入留言" autofocus>
  38. </div>
  39.     <script>
  41.         const insertComment = function(ele){
  42.             // 按下回车键提交
  43.             if(event.key === 'Enter'){
  44.                 // 非空判断
  45.                 if(ele.value.length === 0){
  46.                     alert('消息不能为空')
  47.                     // 重置焦点
  48.                     ele.focus()
  49.                     // 直接返回
  50.                     return false 
  51.                 }
  53.         const ul = document.querySelector('.test');
  54.         ul.insertAdjacentHTML('beforeend', `<li>${ele.value}</li>`);
  56.         ele.value = null 
  57.             }
  59.         }
  62.     </script>
  63. </body>
  64. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：可以, 效果实现的不错, 可以再尝试用css美化一下
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