var data = ['Phone5', 'Ipad', '三星笔记本', '佳能相机', '惠普打印机', '谢谢参与', '50元充值卡', '1000元超市购物券'],

timer = null,

flag=0;

window.onload = function() {

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

stop = document.getElementById('stop');//如果放在外面获取不到

play.onclick = playFun;

stop.onclick= stopFun;

document.onkeyup=function(event){//这里keyup前面有on

event=event||window.event;

if(event.keyCode==13){

if(flag==0){//比较是==

playFun();

flag=1;

}else{

stopFun();

flag=0;

}

}

}

}

function playFun() {

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

play = document.getElementById('play');

clearInterval(timer);

timer = setInterval(function() {

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

title.innerHTML = data[random];

}, 100);

play.style.background="#ccc";

flag=1;

}

function stopFun(){

clearInterval(timer);

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

play.style.background="#333";

flag=0;

}