本文实例为大家分享了js实现漂亮星空背景的具体代码，供大家参考，具体内容如下

HTML代码：

<div class="stars"></div>

css代码

 html,body {
 height: 100%;
 overflow: hidden;
 }

 body {
 width: 100%;
 height:100%;
 background: #000;
 background-size: 100%;
 perspective: 500px;

 }
 .stars {
 position: absolute;
 top: 50%;
 left: 50%;
 width: 4px;
 height:4px;
 -webkit-border-radius:50%;
 -moz-border-radius:50%;
 border-radius:50%;
 animation: fly 2s linear infinite;
 transform-style: preserve-3d;
 }
 .stars:before,.stars:after {
 content: "";
 position: absolute;
 width: inherit;
 height: inherit;
 Box-shadow: inherit;
 }
 .stars:before {
 transform: translateZ(-300px);
 opacity: .6;
 }
 .stars:after {
 transform: translateZ(-600px);
 opacity: .4;
 }

 @keyframes fly {
 from {
 transform: translateZ(0px);
 opacity: .6;
 }
 to {
 transform: translateZ(300px);
 opacity: 1;
 }
 }

js代码

var w = document.documentElement.clientWidth*1.2;
var h = document.documentElement.clientHeight*1.2;
var star = document.getElementsByClassName("stars")[0];
var n = 1000;
 //随机函数
 function randomNum(m,n) {
 return Math.floor(Math.random() * (n - m + 1) + m);
 }
 var str = '';
 for (var i = 0; i < n; i++) {
 var numX = randomNum(-w,w);
 var numY = randomNum(-h,h);
 var color = 'rgb(' + randomNum(0,255) + ',' + randomNum(0,255) + ')';
 str += numX +'px'+' ' + numY+'px'+' '+ color+',';
 }
 str = str.slice(0,-1);
 star.style.BoxShadow = str;

  $(function(){

   $('#main').fadeOut();

   $('#main').fadeIn('slow');

 })

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我们。