j's简单倒计时

不想每次用倒计时，都现写代码，比较烦，这里记一下，也顺便分享一些倒计时简单的逻辑。如果你有更简单方便的代码，可以分享给大家。var method = { countdownObj: { timer: null, time: 0, changeTime: 0, }, countdown: function(long, back) { var that = this; if (that.countdownObj.timer) { clearInterval(that.countdownObj.timer); } that.countdownObj.time = long; that.countdownObj.changeTime = long; back(that.countdownObj.changeTime); that.countdownObj.timer = setInterval(function() { that.countdownObj.changeTime–; back(that.countdownObj.changeTime); if (that.countdownObj.changeTime < 1) { clearInterval(that.countdownObj.timer); } }, 1000); }};methods.countdown(60,function(time){ console.log(time);});函数里第一个数字是到时间长度，第二个回调函数，回传的time就是当前时间。