设置一个延时来推迟执行队列中之后的项目。这个方法不能取代JS原生的setTimeout。
The .delay() method is best for delaying between queued jQuery effects. Because it is limited—it doesn't, for example, offer a way to cancel the delay—.delay() is not a replacement for JavaScript's native setTimeout function, which may be more appropriate for certain use cases.
例子：在.slideUp() 和 .fadeIn()之间延时800毫秒。
HTML 代码:
<div id="foo /">
jQuery 代码:
$('#foo').slideUp(300).delay(800).fadeIn(400)
2. 通过循环消耗cpu
function sleep(n) {
var start = new Date().getTime()
while(true) if(new Date().getTime()-start >n) break
}
3. 用setTimeout。
假设有三个步骤，步骤之间需要暂停一段时间；可以采用如下的方法：
function firstStep() {
//do something
setTimeout("secondStep()", 1000)
}
function secondStep() {
//do something
setTimeout("thirdStep()", 1000)
}
function thirdStep() {
//do something
}
使用调用自定义函数的方式消耗时间：function sleep(numberMillis) {
var now = new Date()
var exitTime = now.getTime() + numberMillis
while (true) {
now = new Date()
if (now.getTime() >exitTime)
return
}
}
