<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>进度条</title> <script type="text/javascript" src='/images/loading.gif' data-original="http://lib.sinaapp.com/js/jquery/1.4.1/jquery.min.js"></script> </head> <body> <div class="spinner"> </div> </body></html>
body,div { padding: 0; margin: 0;}div.spinner { position: absolute; width: 160px; height: 160px; margin-left: 240px; margin-top: 350px;}div.loaderdot { position: absolute; width: 20px; height: 20px; border-radius: 50%; background-color: rgb(29, 140, 248);} 1 window.onload = function() {
2 var total = 16, 3 angle = 3 * Math.PI, 4 Radius = 80, 5 html = ''; 6 var spinnerL = parseInt($("div.spinner").css("margin-left")); 7 var spinnerT = parseInt($("div.spinner").css("margin-top")); 8 for (var i = 0; i < total; i++) { 9 //对每个元素的位置和透明度进行初始化设置10 var loaderL = Radius + Radius * Math.sin(angle) - 10;11 var loaderT = Radius + Radius * Math.cos(angle) - 10;12 html += "<div class='loaderdot' style='left:" + loaderL + "px;top:" + loaderT + "px; opacity:" + i / (total - 1) + "'></div>";13 angle -= 2 * Math.PI / total;14 }15 $("div.spinner").empty().html(html);16 var lastLoaderdot = $("div.loaderdot").last();
17 timer = setInterval(function() {18 $("div.loaderdot").each(function() {19 var self = $(this);20 var prev = self.prev().get(0) ? self.prev() : lastLoaderdot,21 opas = prev.css("opacity");22 self.animate({23 opacity: opas24 }, 50);25 });26 }, 60);27}
运行结果:http://landingpage.hdtmedia.com//learning/20150612/loading.html
原标题:用jquery制作加载条
关键词:jquery