留言板

效果图

代码

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>留言板</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      body .lyb .srk input {
        padding: 30px;
        height: 50px;
        width: 200px;
        border-radius: 5px;
        outline: none;
      }
      .lyb {
        width: 50%;
        height: 100%;
        background-color: cadetblue;
      }
      .srk {
        display: grid;
        place-content: center;
        height: 100px;
      }
      ul {
        position: relative;
      }
      li {
        list-style: none;
      }
      button {
        font-size: 15px;
        line-height: 15px;
        text-align: center;
        border-radius: 50%;
        background-color: mediumvioletred;
        position: absolute;
        right: 0;
      }
    </style>
  </head>
  <body>
    <div class="lyb">
      <div class="srk">
        <input
          type="text"
          onkeydown="addMsg(this)"
          placeholder="请输入类容"
          autofocus
        />
      </div>
      <ul class="list"></ul>
    </div>
    <script>
      function addMsg(ele) {
        if (event.key === 'Enter') {
          // 获取留言板类容
          const ul = document.querySelector('.list');
          //判断用户留言是否为空
          if (ele.value.trim().length === 0) {
            alert('留言不能为空');
            ele.focus();
            return false;
          }
          //添加一条留言
          const li = document.createElement('li');
          li.innerHTML =
            ele.value + '<button onclick="del(this.parentNode)">删除</button>';
          ul.insertAdjacentElement('afterBegin', li);
          //将输入框中的前一条留言清空
          ele.value = null;
          //焦点重置
          ele.focus();
        }
      }
      //删除
      function del(ele) {
        return confirm('是否删除' ? ele.remove() : false);
      }
    </script>
  </body>
</html>

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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留言板

效果图

代码