js中关于setTimeOut（）循环的问题

function stop() {

clearTimeout(t);

}

function checkTime(i) {

if (i < 10) {

i = "0" + i;

}

return i;

}

function fun2(week) {

var Week = [ "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" ];

return Week[week];

}

function startTime() {

var today = new Date();

var year = today.getFullYear();

var Month = today.getMonth() + 1;

var day = today.getDate();

var h = today.getHours();

var m = today.getMinutes();

var s = today.getSeconds();

var week = today.getDay();

m = checkTime(m);

s = checkTime(s);

document.getElementByIdx_x("txt").value = year + "/"

+ checkTime(Month) + "/" + day + " " + h + ":" + m + ":"

+ s + " " + fun2(week);

t = setTimeout("startTime()", 1000);

}

startTime();

上面代码运行起来是没错

若是这样呢

while(true){

t = setTimeout("startTime()", 1000);

}

今天同学问到了这个为啥不能用循环呢，我给的解释就是用循环没有结束标记一直循环就会内存溢出，内存会爆表，于是乎我就试了试，果然，一试不要紧，360加速球直接从40%跑到99%爆表    电脑滋啦啦的响了一声，于是我只能强制关机，今天又看了看，原来循环不会因为setTimeout的存在而停止，他会跳过循环一直执行，这也就解释了为什么我的电脑会那样。。。