DOM ------ 仿淘宝关闭二维码

    //css代码
    .box{
            position: relative;
            width: 74px;
            height: 88px;
            border: 1px solid #ccc;
            margin: 100px auto;
            font-size: 12px;
            text-align: center;
            color: blue;
        }
        .box img {
            width: 60px;
            margin-top: 5px;
        }
        .close-btn {
            position: absolute;
            top: -1px;
            left: -16px;
            width: 14px;
            height: 14px;
            border: 1px solid #ccc;
            line-height: 14px;
            font-family: Arial, Helvetica, sans-serif;
            cursor: pointer;
        }
    //html代码
    <div class="box">
          二维码
          <img src="../Picture/二维码.png">
          <i class="close-btn">x</i>
      </div>
      //js代码
      var btn = document.querySelector('.close-btn')
        var box = document.querySelector('.box')
        // 2.注册事件 程序处理
        btn.onclick = function() {
            box.style.display = 'none'  //隐藏二维码
        }