微博发布案例

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>微博发布</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    ul {
      list-style: none;
    }
    .w {
      width: 900px;
      margin: 0 auto;
    }
    .controls textarea {
      width: 878px;
      height: 100px;
      resize: none;
      border-radius: 10px;
      outline: none;
      padding-left: 20px;
      padding-top: 10px;
      font-size: 18px;
    }
    .controls {
      overflow: hidden;
    }
    .controls div {
      float: right;
    }
    .controls div span {
      color: #666;
    }

    .controls div .useCount {
      color: red;
    }
    .controls div button {
      width: 100px;
      outline: none;
      border: none;
      background: rgb(0, 132, 255);
      height: 30px;
      cursor: pointer;
      color: #fff;
      font: bold 14px '宋体';
      transition: all 0.5s;
    }
    .controls div button:hover {
      background: rgb(0, 225, 255);
    }
    .controls div button:disabled {
      background: rgba(0, 225, 255, 0.5);
    }
    .contentList {
      margin-top: 50px;
    }
    .contentList li {
      padding: 20px 0;
      border-bottom: 1px dashed #ccc;
      position: relative;
    }
    .contentList li .info {
      position: relative;
    }
    .contentList li .info span {
      position: absolute;
      top: 15px;
      left: 100px;
      font: bold 16px '宋体';
    }
    .contentList li .info p {
      position: absolute;
      top: 40px;
      left: 100px;
      color: #aaa;
      font-size: 12px;
    }
    .contentList img {
      width: 80px;
      border-radius: 50%;
    }
    .contentList li .content {
      padding-left: 100px;
      color: #666;
      word-break: break-all;
    }
    .contentList li .the_del {
      position: absolute;
      right: 0;
      top: 0;
      font-size: 28px;
      cursor: pointer;
    }
  </style>
  <script src="js/random.js"></script>
</head>

<body>
  <div class="w">
    <!-- 操作的界面 -->
    <div class="controls">
      <img src="./images/9.6/tip.png" alt="" /><br />
      <!-- maxlength 可以用来限制表单输入的内容长度 -->
      <textarea placeholder="说点什么吧..." id="area" cols="30" rows="10" maxlength="200"></textarea>
      <div>
        <span class="useCount" id="useCount">0</span>
        <span>/</span>
        <span>200</span>
        <button id="send">发布</button>
      </div>
    </div>
    <!-- 微博内容列表 -->
    <div class="contentList">
      <ul id="list">
        <li>
          <div class="info">
            <img class="userpic" src="./images/9.5/01.jpg" />
            <span class="username">名字</span>
            <p class="send-time">发布于 时间</p>
          </div>
          <div class="content">内容</div>
          <span class="the_del">X</span>
        </li>
      </ul>
    </div>
  </div>

  <script>
    // 模拟数据，后期我们需要从这个数组中随机获取一个数据对象，做为发布微博的用户信息进行渲染，但是这个不是关键业务，我也可以固定写死
    let dataArr = [
      { uname: '司马懿', imgSrc: './images/9.5/01.jpg' },
      { uname: '女娲', imgSrc: './images/9.5/02.jpg' },
      { uname: '百里守约', imgSrc: './images/9.5/03.jpg' },
      { uname: '亚瑟', imgSrc: './images/9.5/04.jpg' },
      { uname: '虞姬', imgSrc: './images/9.5/05.jpg' },
      { uname: '张良', imgSrc: './images/9.5/06.jpg' },
      { uname: '安其拉', imgSrc: './images/9.5/07.jpg' },
      { uname: '李白', imgSrc: './images/9.5/08.jpg' },
      { uname: '阿珂', imgSrc: './images/9.5/09.jpg' },
      { uname: '墨子', imgSrc: './images/9.5/10.jpg' },
      { uname: '鲁班', imgSrc: './images/9.5/11.jpg' },
      { uname: '嬴政', imgSrc: './images/9.5/12.jpg' },
      { uname: '孙膑', imgSrc: './images/9.5/13.jpg' },
      { uname: '周瑜', imgSrc: './images/9.5/14.jpg' },
      { uname: '老夫子', imgSrc: './images/9.5/15.jpg' },
      { uname: '狄仁杰', imgSrc: './images/9.5/16.jpg' },
      { uname: '扁鹊', imgSrc: './images/9.5/17.jpg' },
      { uname: '马可波罗', imgSrc: './images/9.5/18.jpg' },
      { uname: '露娜', imgSrc: './images/9.5/19.jpg' },
      { uname: '孙悟空', imgSrc: './images/9.5/20.jpg' },
      { uname: '黄忠', imgSrc: './images/9.5/21.jpg' },
      { uname: '百里玄策', imgSrc: './images/9.5/22.jpg' }
    ]

    //获取元素
    let send = document.querySelector('#send')   //发布按钮
    let list = document.querySelector('#list')           //列表
    let useCount = document.querySelector('#useCount')  //内容
    let area = document.querySelector('#area')  //文本域

    //进入页面有一个聚焦
    area.focus()

    //为发布按钮绑定点击事件
    send.addEventListener('click', function () {

      //生成一个随机数据获取dataArr里面的数据
      let index = parseInt(Math.random() * dataArr.length)
      
      //收集用户输入的内容
      let useCount = area.value
      if (useCount.length === 0) {
        alert('请输入微博内容')
        return
      }
      //创建一个li结构
      let li = document.createElement('li')
      li.innerHTML = `<div class="info">
                          <img class="userpic" src="${dataArr[index].imgSrc}" />
                          <span class="username">${dataArr[index].uname}</span>
                          <p class="send-time">发布于 ${dateFormat()}</p>
                      </div>
                      <div class="content">${useCount}</div>
                      <span class="the_del">X</span>`
      //把添加的数据插入到前面
      list.insertBefore(li, list.children[0])

      //获取关闭按钮
      let the_del = document.querySelector('.the_del')

      //为关闭按钮绑定事件
      the_del.addEventListener('click', function () {
        //删除添加的元素  父元素.removeChild(要删除的内容)
        list.removeChild(li)
      })
      //发布按钮点击过后内容清空
      area.value = ''
    })
    //为文本域添加一个内容监听事件
    area.addEventListener('input', function () {
      useCount.innerText = area.value.trim().length
    })
    
     //按下回车键发布内容
    area.addEventListener('keyup', function (e) {
      console.log(e);
      if (e.key === 'Enter') {
        send.click()
      }
    })

    //封装一个格式化时间的函数
    let dateFormat = function () {
      let date = new Date()
      let year = date.getFullYear()
      let month = date.getMonth() + 1
      let day = date.getDate()
      let hour = date.getHours()
      let min = date.getMinutes()
      let second = date.getSeconds()

      return (`${year}-${month}-${day}-${hour}-${min}-${second}`);
    }
    
  </script>
</body>
</html>
webapi，微博发布案例，js

微博发布案例
