var num = 3;
var timer = null;
$('#window').html(num+ '秒后干啥');
clearInterval(timer);
timer = setInterval(function(){
num--;
if(num<1) {
clearInterval(timer);
window.location.href = ""
}
$('#window').html(num+'秒后干啥');
},1000);
转载于:https://www.cnblogs.com/zhuzhiq/p/5731769.html