幸运大抽奖全新来袭，现在普遍的抽奖活动都是由flash开发的，然而，今天向大家展示由js实现的抽奖。早在2012年的时候写过一篇文章关于js抽奖的 。
借助raphaeljs插件实现，官网： 中文文档： 幸运大抽奖已两种方式展现，一种是圆盘旋转（猎豹式），另一种是指针旋转（考拉式），实现抽奖三部曲。第一部：绘制圆盘和指针。var r = Raphael("test",300,300);// 绘制圆盘r.image("pan.jpg",0,0,300,300);// 绘制指针r.image("pointer.png",145,0,10,150);
第二部：圆盘旋转（猎豹式）。
btn.click(function(){ // 清空中奖结果 result.html(""); // 清空画布 r.clear(); // 重新绘制圆盘和指针 pan = r.image(pic,0,0,300,300); r.image(pointer,145,0,10,150); // 选中角度 var angle = -parseInt(Math.random()*3000+6000); // 中奖结果 var tmp = Math.abs(parseInt(((angle-30)%360)/60))+1; pan.animate({transform: "r" + angle}, 1000, ">",function(){ result.html("恭喜您获得"+tmp+"奖"); });}); 第三部：指针旋转（考拉式）。
btn.click(function(){ // 清空中奖结果 result.html(""); // 设置暂停、计数、角度、中奖结果 var stop=null, index = 0, angle= parseInt(Math.random()*360), tmp =Math.abs(parseInt(((angle+30)%360)/60))+1; // 清空画布，重新绘制圆盘和指针 r.clear(); r.image(pic,0,0,300,300); point = r.image(pointer,145,0,10,150); // 中奖结果 stop = setInterval(function(){ index++; if(index>=angle){ clearInterval(stop); result.html("恭喜您获得"+tmp+"奖"); } point.rotate(1,150,150); },100);}); <!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>幸运大抽奖</title> <style> *{margin: 0;padding: 0;} .main{width:960px; margin: 0px auto;} .main .title{color: #f00; font-size: 50px;font-weight:bold;text-align: center; text-shadow: 3px 1px 6px #f60; padding: 30px 0px;} .main .block{overflow: hidden;} .main .blockLt{float: left;width:480px; text-align: center;} .main .blockBtn{} .main .blockBtn input{width: 100px; height: 30px; line-height: 30px; font-size: 16px; cursor: pointer;} .main .blockBtn p{margin: 20px auto 0px;} .main .blockPan{width: 300px; height: 300px; margin: 10px auto; overflow: hidden;} .main .blockRes{} </style> </head> <body> <div class="main"> <div class="title">幸运大抽奖</div> <div class="block"> <div class="blockLt"> <div class="blockBtn"> <input id="btnOne" type="button" value="抽奖"> <p>================圆盘转动(猎豹式)================</p> </div> <div id="testOne" class="blockPan"></div> <div id="resultOne" class="blockRes"></div> </div> <div class="blockLt"> <div class="blockBtn"> <input id="btnTwo" type="button" value="抽奖"> <p>================指针转动(考拉式)================</p> </div> <div id="testTwo" class="blockPan"></div> <div id="resultTwo" class="blockRes"></div> </div> </div> </div> <script src="http://files.cnblogs.com/kuikui/jquery-1.10.2.min.js"></script> <script src="http://files.cnblogs.com/kuikui/raphael.js"></script> <script> $(function(){ var btnOne = $("#btnOne"), btnTwo = $("#btnTwo"), resultOne = $("#resultOne"), resultTwo = $("#resultTwo"), pic = "http://images.cnblogs.com/cnblogs_com/kuikui/354173/o_pan.jpg", pointer = "http://images.cnblogs.com/cnblogs_com/kuikui/354173/o_pointer.png"; var rOne = Raphael("testOne",300,300); var panOne = rOne.image(pic,0,0,300,300); rOne.image(pointer,145,0,10,150); btnOne.click(function(){ resultOne.html(""); rOne.clear(); panOne = rOne.image(pic,0,0,300,300); rOne.image(pointer,145,0,10,150); var angle = -parseInt(Math.random()*3000+6000); var tmp = Math.abs(parseInt(((angle-30)%360)/60))+1; panOne.animate({transform: "r" + angle}, 1000, ">",function(){ resultOne.html("恭喜您获得"+tmp+"奖"); }); }); var rTwo = Raphael("testTwo",300,300); rTwo.image(pic,0,0,300,300); var point = rTwo.image(pointer,145,0,10,150); point.rotate(0,150,150); btnTwo.click(function(){ resultTwo.html(""); var stop=null, index = 0, angle= parseInt(Math.random()*360), tmp =Math.abs(parseInt(((angle+30)%360)/60))+1; rTwo.image(pic,0,0,300,300); point = rTwo.image(pointer,145,0,10,150); stop = setInterval(function(){ index++; if(index>=angle){ clearInterval(stop); resultTwo.html("恭喜您获得"+tmp+"奖"); } point.rotate(1,150,150); },100); }); }); </script> </body> </html>
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