<div></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) + ',' + randomNum(0, 255) + ')'; str += numX +'px'+' ' + numY+'px'+' '+ color+','; } str = str.slice(0,-1); star.style.boxShadow = str; $(function(){ $('#main').fadeOut(); $('#main').fadeIn('slow'); })