//?JavaScript?Document
var?data=['iPhone5','50元充值卡','100元超市購物卷','數碼相機','謝謝參與！','筆記本電腦','筆記本','SB稱號','抽個毛線'];
var?timer=null;
var?flag=0;

window.onload=function()
{
????var?title=document.getElementById('title'),
????????begin=document.getElementById('begin'),
????????stop1=document.getElementById('stop');
????begin.onclick=begindraw;
????stop1.onclick=stopdraw;
????document.onkeydown=function(e){
????????e=e||window.event;
????????if(e.keyCode==13){
????????????if(flag==0){
????????????????begindraw();
????????????????flag=1;
????????????????}else{
????????????????????stopdraw();
????????????????????flag=0;
????????????????}
????????????}????????
????????}
????????
}

function?begindraw()
{????
????clearInterval(timer);
????timer=setInterval(bdraw,50);
????begin.style.background="#999";
????}
function?bdraw()
{
????var?random1=Math.floor(Math.random()*data.length);
????//console.log(random1);
????title.innerHTML=data[random1];
????}
function?stopdraw(){
????????clearInterval(timer);
????????begin.style.background="#00C";
????????}

我在begindraw里，stopdraw里都沒有引入onload中的變量，結果還是一樣運行了。