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基于JavaScript实现飘落星星特效

时间:2021-07-01 10:21:17 帮助过:8人阅读

本文实例为大家分享了js飘落星星特效的具体代码,供大家参考,具体内容如下

1.效果图

2.代码

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="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> 
 
</head> 
 
<body> 
 
 
</body> 
</html> 

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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