不废话，直接上代码
思路不难，就是一个animate方法配合随机数
duration内个三秒钟，是自定义的，可以改成页面加载时间，这样就完美了
<!doctype html> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> <script src="js/jquery-1.8.3.min.js"></script> <style> body { margin: 0; } #progress { position: fixed; height: 2px; background: #2085c5; transition: opacity 500ms linear } #progress.done { opacity: 0 } #progress span { position: absolute; height: 2px; -webkit-box-shadow: #2085c5 1px 0 6px 1px; -webkit-border-radius: 100%; opacity: 1; width: 150px; right: -10px; -webkit-animation: pulse 2s ease-out 0s infinite; } @-webkit-keyframes pulse { 30% { opacity:.6 } 60% { opacity:0; } 100% { opacity:.6 } } </style> </head> <body> <div id="progress"><span></span></div> <script> $({property: 0}).animate({property: 100}, { duration: 3000, step: function() { var percentage = Math.round(this.property); $(‘#progress‘).css(‘width‘, percentage+"%"); if(percentage == 100) { $("#progress").addClass("done");//完成，隐藏进度条 } } }); </script> </body> </html>
原文：http://www.cnblogs.com/Sinhtml/p/4537708.html