Javascript 随机抽奖

Code:

     <body>

        <div style="width:365px;height:180px;border:2px solid green" id="names">

        <script>

            for(var i=1;i<=40;i++){

                document.write('<div style="width:45px;height:35px;background:#ccc;float:left;border:2px solid white;text-align:center;padding-top:7px;">'+ i +'</div>')

            }

        </script>        

        </div>

        <a href="javascript:oaction()" style="margin:5px;" >开始抽奖</a>

        <a href="javascript:clearInterval(sh)" style="margin:5px;" >停止抽奖</a>

        <script>

            var names = document.getElementById("names").getElementsByTagName("div");

            var length = names.length;

            var oldNum = 0;

            var sh;

            function run(){

                var num = Math.floor((Math.random()*40));

                names[oldNum].style.background = "#ccc";

                oldNum = num;

                names[num].style.background="green";    

            }        

            function oaction(){

                sh=setInterval(run,10)

            }

        </script>

    </body>

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原文地址：https://www.cnblogs.com/SkySoot/p/2458723.html