jquery制作加载条 – 有爱前端

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>进度条</title> <style> 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); } </style> <script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.4.1/jquery.min.js"></script> </head> <body> <div class="spinner"> </div> <script> window.onload = function() { var total = 16, angle = 3 * Math.PI, Radius = 80, html = ''; var spinnerL = parseInt($("div.spinner").css("margin-left")); var spinnerT = parseInt($("div.spinner").css("margin-top")); for (var i = 0; i < total; i++) { //得到每个元素的位置 var loaderL = Radius + Radius * Math.sin(angle) - 10; var loaderT = Radius + Radius * Math.cos(angle) - 10; html += "<div class='loaderdot' style='left:" + loaderL + "px;top:" + loaderT + "px; opacity:" + i / (total - 1) + "'></div>"; angle -= 2 * Math.PI / total; } $("div.spinner").empty().html(html); var lastLoaderdot = $("div.loaderdot").last(); timer = setInterval(function() { $("div.loaderdot").each(function() { var self = $(this); var prev = self.prev().get(0) ? self.prev() : lastLoaderdot, opas = prev.css("opacity"); self.animate({ opacity: opas }, 50); }); }, 60); } </script> </body> </html>

提示：你可以先修改部分代码再运行。

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