jQuery css3星云密布背景动画特效

使用方法：

1、head引入css文件

<style>
body {
  background: radial-gradient(200% 100% at bottom center, #f7f7b6, #e96f92, #75517d, #1b2947);
  background: radial-gradient(220% 105% at top center, #1b2947 10%, #75517d 40%, #e96f92 65%, #f7f7b6);
  background-attachment: fixed;
  overflow: hidden;
}

@keyframes rotate {
  0% {
    transform: perspective(400px) rotateZ(20deg) rotateX(-40deg) rotateY(0);
  }
  100% {
    transform: perspective(400px) rotateZ(20deg) rotateX(-40deg) rotateY(-360deg);
  }
}
.stars {
  transform: perspective(500px);
  transform-style: preserve-3d;
  position: absolute;
  bottom: 0;
  perspective-origin: 50% 100%;
  left: 50%;
  animation: rotate 90s infinite linear;
}

.star {
  width: 2px;
  height: 2px;
  background: #F7F7B6;
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0 -300px;
  transform: translate3d(0, 0, -300px);
  backface-visibility: hidden;
}
</style>

2、head引入js文件

<script src="js/jquery.min.js"></script>

3、body引入HTML代码

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

<script>
$(document).ready(function(){
  var stars=800;
  var $stars=$(".stars");
  var r=800;
  for(var i=0;i<stars;i++){
    var $star=$("<div/>").addClass("star");
    $stars.append($star);
  }
  $(".star").each(function(){
    var cur=$(this);
    var s=0.2+(Math.random()*1);
    var curR=r+(Math.random()*300);
    cur.css({ 
      transformOrigin:"0 0 "+curR+"px",
      transform:" translate3d(0,0,-"+curR+"px) rotateY("+(Math.random()*360)+"deg) rotateX("+(Math.random()*-50)+"deg) scale("+s+","+s+")"
       
    })
  })
})</script>