留言板功能css美化

图片

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;
      }
      li {
        list-style: none;
      }
      a {
        text-decoration: none;
      }
      body {
        margin: auto;
      }
      .box {
        width: 100vw;
        display: grid;
        grid-template-rows: 60px 100px 1fr;
      }
      .box .title {
        height: 50px;
        border-bottom: 1px solid #333;
      }
      .box .content input:hover {
        box-shadow: 2px 2px 10px #06c;
      }
      .box .content {
        display: grid;
        grid-template-rows: 1fr 33px;
      }
      .box .content button {
        width: 70px;
        height: 32px;
        line-height: 32px;
        background-color: #009688;
        color: #fff;
        white-space: nowrap;
        text-align: center;
        font-size: 14px;
        border: none;
        border-radius: 2px;
        margin-top: 10px;
        place-self: start end;
      }
      .box .list {
        margin-top: 20px;
      }
      .box .list li {
        display: grid;
        grid-template-columns: 1fr 50px;
        place-content: space-between;
      }
      .box .list li {
        padding: 3px 0;
        background-color: #f4f4f4;
        border-bottom: 1px solid #333;
      }
      .box .list li button {
        background-color: orangered;
        color: #fff;
        white-space: nowrap;
        text-align: center;
        font-size: 14px;
        border: none;
        border-radius: 2px;
      }
      .box .list li button:hover {
        box-shadow: 0px 0px 10px red;
      }
    </style>
  </head>
  <body>
    <hr />
    <div class="box">
      <h1 class="title">留言板</h1>
      <div class="content">
        <textarea
          name=""
          class="ele"
          cols="30"
          rows="4"
          placeholder="内容不能为空"
          autofocus
        ></textarea>
        <button onclick="addMsg()">立即提交</button>
      </div>
      <ul class="list"></ul>
    </div>
    <script>
      function addMsg() {
        let ele = document.querySelector(".ele");
        if (ele.value.trim().length === 0) {
          alert("留言不能为空");
          ele.focus();
          return false;
        }
        const ul = document.querySelector(".list");
        const li = document.createElement("li");
        li_length = ul.children.length + 1;
        li.innerHTML =
          li_length +
          "楼： " +
          ele.value +
          '<button onclick="del(this.parentNode);">删除</button>';
        // console.log(li_length);
        ul.insertAdjacentElement("afterBegin", li);
        ele.value = null;
        ele.focus();
      }
      function del(ele) {
        if (confirm("是否删除")) {
          ele.remove();
        } else {
          return false;
        }
      }
    </script>
  </body>
</html>