代码
1.JS文件

    var namelist=[
    "1号球","2号球","3号球","4号球","5号球","6号球","7号球","8号球","9号球","10号球"];
    var mytime=null;
    
    function doit(){
        var bt=window.document.getElementById("bt");
        if(mytime==null){
            bt.innerHTML="停止抽奖";
            show();                    
        }else{
            bt.innerHTML="开始抽奖";
            clearTimeout(mytime);
            mytime=null;                    
        }
    }
    
    function show(){
        var box=window.document.getElementById("box");
        var num=Math.floor((Math.random()*100000))%namelist.length;
        box.innerHTML=namelist[num];
        mytime=setTimeout("show()",1);
    } // JavaScript Document

2.html文件

    <script type="text/javascript" src="js.js">
    
    </script>