dateCount(endTime){// 现在时间var now= new Date();//截止时间var until= new Date(endTime);// 计算时会发生隐式转换，调用valueOf()方法，转化成时间戳的形式var days = (until- now)/1000/3600/24; // 下面都是简单的数学计算 var day = Math.floor(days);var hours = (days - day)*24;var hour = Math.floor(hours);var minutes = (hours - hour)*60;var minute = Math.floor(minutes);var seconds = (minutes - minute)*60;var second = Math.floor(seconds);var back = '剩余时间：'+day+'天'+hour+'小时'+minute+'分钟'+second+'秒';return back;}