防止接下来抽的时候再次抽中该怎么办啊<!DOCTYPE html><html> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>jquery随机抽奖</title> <head> <script type="text/javascript" src="jq/jquery-3.1.1.js"></script></script> <script type="text/javascript"> $(function(){ var alldata = new Array("2.jpg","3.jpg","4.jpg","5.jpg"); var num = alldata.length - 1; var start = $("#start"); var btn = $("#btn"); var show = $("#show"); var open = false; function change(){ var randomVal = Math.round(Math.random() * num); var prizeName = alldata[randomVal]; start.attr("src",prizeName); } function run(){ if(!open){ timer=setInterval(change,30); btn.removeClass('start').addClass('stop').text('停止'); open = true; }else{ clearInterval(timer); show.animate({bottom:"50px"},300); show.animate({bottom:"0px"},300); btn.removeClass('stop').addClass('start').text('开始抽奖'); open = false; } } btn.click(function(){run();}) }) </script> <style> body{ background:#fff;} .wrap{ width:300px; margin:100px auto; font-family:"微软雅黑";border: 1px solid red; } .show{ width:300px; height:300px; background-color:#ff3300; line-height:300px; text-align:center; color:#fff; font-size:28px; -moz-border-radius:150px; -webkit-border-radius:150px; border-radius:150px; background-image: -webkit-gradient(linear,0% 0%, 0% 100%, from(#FF9600), to(#F84000), color-stop(0.5,#fb6c00)); -moz-box-shadow:2px 2px 10px #BBBBBB; -webkit-box-shadow:2px 2px 10px #BBBBBB; box-shadow:2px 2px 10px #BBBBBB;overflow: hidden; position: relative;} .btn a{ display:block; width:120px; height:50px; margin:30px auto; text-align:center; line-height:50px; text-decoration:none; color:#fff; -moz-border-radius:25px; -webkit-border-radius:25px; border-radius:25px;} .btn a.start{ background:#80b600;} .btn a.start:hover{ background:#75a700;} .btn a.stop{ background:#00a2ff;} .btn a.stop:hover{ background:#008bdb;} </style> </head> <body> <div class="wrap"> <div class="show" id="show"><img id="start" src="1.jpg"></div> <div class="btn"> <a href="javascript:void(0)" class="start" id="btn">开始抽奖</a> </div> </div> </body></html>
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