var data=['iphone 5','ipad','佳能相机','谢谢参与'],

timer=null;

window.onload=function(){

var title=document.getElementById('title'),

play=document.getElementById('play'),

stop=document.getElementById('stop');

//开始抽奖

play.onclick=playFun;

stop.onclick=stopFun;

}

function playFun() {

clearInterval(timer);

var title=document.getElementById('title'),

timer=setInterval(function(){

var random=Math.floor(Math.random()*data.length);

title.innerHTML=data[random];

},50);

this.style.background='#999';

}

function stopFun(){

clearInterval(timer);

var play=document.getElementById('play');

play.style.background="#036";

}