修改留言板

一. 改写留言板案例,适当添加CSS美化

一）html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=], initial-scale=1.0" />
    <title>todoList:留言板</title>
    <link rel="stylesheet" href="css/font-icon.css" />
  </head>
  <body>
    <style>
      .list {
        list-style: none;
      }
      .title a {
        text-decoration: none;
      }
      .title1 a {
        margin: 0;
        text-decoration: none;
      }
      .title1 h {
        list-style: none;
      }
      .title1 {
        height: 50px;
        width: 699px;
        border: 1px solid red;
        text-align: center;
        background-color: brown;
        display: table;
      }
      .title1 > a {
        font-size: x-large;
        background-color: lawngreen;
        display: table-cell;
        vertical-align: middle;
        background-image: url(image/title1.png);
        background-size: auto 100%;
      }
      .title1 > .Subtitle {
        background-color: blue;
        margin: 0;
      }
      .title {
        height: 50px;
        width: 684px;
        border-top: 1px solid red;
        border-left: 1px solid red;
        border-right: 1px solid red;
        text-align: center;
      }
      .title.navigation {
        display: flex;
        place-items: center;
        padding-left: 15px;
        gap: 20px;
      }
      .title.navigation a {
        font-size: large;
      }
      .content {
        width: 700px;
        display: grid;
        grid-template-columns: 500px 1fr;
        grid-template-rows: 200px 100px;
        margin: 1px;
        gap: 5px;
      }
      .members {
        grid-row: span 2;
        border: 1px solid red;
        display: grid;
        grid-template-rows: 100px 200px;
        gap: 2px;
      }
      .members .group {
        border: 1px solid red;
        background-color: yellowgreen;
      }
      .DisplayBox {
        height: 200px;
        width: 500px;
        border-top: 1px solid red;
        border-left: 1px solid red;
        border-right: 1px solid red;
      }
      .Input > .nav > .expression {
        text-decoration: none;
      }
      .nav {
        height: 20px;
        border: none;
        display: flex;
        gap: 15px;
      }
      .nav > a {
        color: darkgrey;
      }
      .Button {
        height: 40px;
        text-align: right;
        font-size: x-large;
      }
      input {
        height: 40px;
        border: none;
      }
      .Input.area {
        height: 100px;
        width: 500px;
        border: 1px solid red;
      }
    </style>
    <div class="title1">
      <a href=""></a>
    </div>
    <div class="title navigation">
      <a href="">聊天</a>
      <a href="">公告</a>
      <a href="">相册</a>
      <a href="">文件</a>
      <a href="">作业</a>
      <a href="">设置</a>
    </div>
    <div class="content">
      <div>
        <div class="DisplayBox">
          <ul class="list">
            <li><button>删除</button></li>
            <li><button>删除</button></li>
          </ul>
        </div>
        <div class="Input area">
          <div class="nav">
            <a href="" class="iconfont unicode">&#xe60e;</a>
            <a href="" class="iconfont unicode">&#xe70d;</a>
            <a href="" class="iconfont unicode">&#xe6e8;</a>
            <a href="" class="iconfont unicode">&#xe64c;</a>
            <a href="" class="iconfont unicode">&#xe6ff;</a>
            <a href="" class="iconfont unicode">&#xe6eb;</a>
          </div>
          <input
            type="text"
            onkeydown="insertComment(this)"
            placeholder="请输入留言"
          />
          <div class="Button">
            <button>关闭</button>
            <button>发送</button>
          </div>
        </div>
      </div>
      <div class="members">
        <div class="group Notice">
          <a href="">群通知</a>
        </div>
        <div class="group members1">
          <a href="">群成员</a>
        </div>
      </div>
    </div>
    <script>
      const insertComment = function (ele) {
        // 1.非空判断
        //  console.log(ele)
        // console.log(event);
        // console.log(event.type);
        // console.log(event.key);
        if (event.key === "Enter") {
          if (ele.value.length === 0) {
            alert("留言不能为空");
            ele.focus();
            return false;
          }
          //   2.添加留言
          //   console.log(ele.value);
          // 创造一个新元素来保存留言
          //   const li = document.createElement("li");
          //   li.append(ele.value);
          //   const ul = document.querySelector(".list");
          //   if (ul.firstElementChild !== null) {
          // ul.firstElementChild.before(li);
          //   } else {
          // ul.append(li);
          //   }
          const ul = document.querySelector(".list");
          ele.value += `<button onclick="del(this.parentNode)" >删除</button>`;
          ul.insertAdjacentHTML(`beforeend`, `<li>${ele.value}</li>`);
          // 3.清空输入框
          ele.value = null;
        }
      };
      //   删除
      const del = function () {
        confirm("是否删除?") ? ele.remove() : false;
      };
    </script>
  </body>
</html>