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JS realizes the animation effect of falling stars

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Release： 2018-04-19 10:33:05
Original
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This time I will bring you JS to realize the falling star animation effect. What are the precautions for JS to realize the falling star animation effect. The following is a practical case, let's take a look. 

<!DOCTYPE html>
<htmllang="en">
<head>
 <metacharset="UTF-8">
 <title>Title</title>
 <style>
  img{
   position: absolute;
  }
  body {
   background-image: url(img/bg.jpg);
   background-size: 100%;
  }
 </style>
 <script>
  function Star() {
   this.speed=10;
   this.img=new Image();
   this.img.src="img/star"+parseInt(Math.random()*4+1)+".png";
   this.img.style.width=50+'px';
   this.img.style.height=50+'px';
   this.img.style.top=Math.random()*window.innerHeight+1+'px';
   this.img.style.left=Math.random()*window.innerWidth+1+'px';
   document.body.appendChild(this.img);
  }
  Star.prototype.slip=function () {
   var that=this;
   function move() {
    that.img.style.top=that.img.offsetTop+that.speed+'px';
    console.log(that.img.offsetTop+"star");
    console.log(window.innerHeight+"window");
    if(that.img.offsetTop>window.innerHeight){
     clearInterval(sh);
     that.img.style.height=0;
     that.img.style.width=0;
    }
   }
   var sh=setInterval(move,100);
  }
   setInterval(function () {
    for(var i=1;i<5;i++){
    new Star().slip();
    }
   },1000)
 </script>
<body>
</body>
</html>
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