1倒计时：
countTime(value)
function countTime(value) {
var date = new Date();
var now = date.getTime();
//设置截止时间
var endDate = new Date("2020/5/17 23:59:59");
var end = endDate.getTime();
//时间差
var differTime = end - now;
//定义变量,h,m,s保存倒计时的时间
var h, m, s;
if (differTime >= 0) {
h = Math.floor(differTime / 1000 / 60 / 60);
m = Math.floor(differTime / 1000 / 60 % 60);
s = Math.floor(differTime / 1000 % 60);
h = h < 10 ? ("0" + h) : h;
m = m < 10 ? ("0" + m) : m;
s = s < 10 ? ("0" + s) : s;
var timeDom = "倒计时：" + h + "小时" + m + "分" + s + "秒";
$("#countDown .J_lhour").text(h);
$("#countDown .J_lminute").text(m);
$("#countDown .J_lsec").text(s);
//递归调用函数延时器
setTimeout(function () {
countTime(value)
}, 1000);
} else {
$("#countDown .J_lhour").text('00');
$("#countDown .J_lminute").text('00');
$("#countDown .J_lsec").text('00');
}
}
2，定时到某一事件，然后执行某件事情：
function isEnd() {
var target = Date.parse('2020/06/28 12:00:00');
if(target < Date.now()) {
return true;
}
return false;
}
