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JS implementation of multiple colored balls following the mouse movement example code

小云云Original: 2018-02-02 10:08:561764browse

This article mainly shares with you the JS example code to implement multiple colored balls to follow the movement of the mouse. The implementation method: each ball has its own coordinates. When the ball moves, the coordinates need to be transferred. The first The coordinates are passed to the last coordinate in turn to achieve the effect of the ball moving with it.

Implementation code:

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title>小球运动</title>
  <style type="text/css">
   p {
    border-radius: 50%;
    width: 30px;
    height: 30px;
    position: absolute;
    text-align: center;
    line-height: 30px;
    color: white;
   }
  </style>
 </head>
 <body>
 </body>
 <script type="text/javascript">
  //创建数组存储所有的小球
  var balls = [];
  //创建小球函数
  function createballs(){
   for (var i = 0;i < 60;i++) {
    var ball = document.createElement("p");
     ball.innerHTML = i + 1;
     ball.style.backgroundColor = randomColor();
    //将创建的小球存储到数组中
    document.body.appendChild( ball);
    //将所有的小球存在数组中
     balls.push( ball);
   }
  }
  createballs();
  //随机函数
  function randomNum(m, n) {
   return Math.floor(Math.random() * (n - m + 1) + m);
  }
  //随机颜色
  function randomColor() {
   return "rgb(" + randomNum(0, 255) + "," + randomNum(0, 255) + "," + randomNum(0, 255) + ")";
  }
  document.onmousemove = function(e){
   var eventObj = e || event;
   for(var i = balls.length - 1;i > 0;i--){
    //将小球的下标通过for循环进行传递
     balls[i].style.left = balls[i - 1].style.left;
     balls[i].style.top= balls[i - 1].style.top;
   }
   //将第一个小球赋值为最新的事件对象中的坐标
    balls[0].style.left = eventObj.clientX + "px";
    balls[0].style.top= eventObj.clientY + "px";
  }
 </script>
</html>

Running effect:

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