js实现弹出框跟随鼠标移动

又是新的一天网上冲浪，在bing的搜索页面下看到这样一个效果：

即弹出框随着鼠标的移动而移动。思路大概为：

• 调用onmousemove函数，将鼠标的当前位置赋予弹出框即可

  //html
  
      
  
          
      
      Look At Me
  
  
  Touch Me

  /*css*/
  #clickMe {
      width: 100px;
      height: 40px;
      margin: 100px auto;
      cursor: pointer;
      background-color: brown;
      color: white;
      text-align: center;
      line-height: 40px;
      border-radius: 50%;
  }
  
  #alert {
      width: 200px;
      height: 200px;
      text-align: center;
      background-color: tomato;
      font-size: 20px;
      position: absolute;
      display: none;
  }
  .img{
      width: 80%;
      height: 35%;
      margin: 20% auto;
      border: 2px dotted #ffffff;
  }
  .img img{
      width: 100%;
      height: 100%;
  }

  //javascript
  var click = document.getElementById("clickMe")
  var alert = document.getElementById("alert")
  
  click.onmousemove = function (e) {
      alert.style.left = e.clientX + 20 + "px"
      alert.style.top = e.clientY + 10 + "px"
      alert.style.display = "block";
  }
  
  click.onmouseout = function (e) {
      alert.style.display = "none";
  }

  效果如下：