计算倒计时间

function timeBefore(time) {
    var time1 = Math.floor(time/1000);
    var time2 = (time1/3600)%24
    var day = Math.floor((time1/3600)/24)
    var hour = Math.floor(time2);
    var minute = Math.floor((time2%1)*60)
    var second = Math.floor((time2*60*60)%60)
    if(day>=1){
        return day+"天"+hour+"小时"+minute+"分钟"+second+"秒之前"
    }else if(hour>=1){
        return hour+"小时"+minute+"分钟"+second+"秒之前"
    }else if(minute>=1){
        return minute+"分钟"+second+"秒之前"
    }else if(second>=1){
        return second+"秒之前"
    }else{
        return "没有之前"
    }

}

此时的参数time应该是得出的时间戳结果单位为毫秒

console.log(data.toLocaleDateString())    //2018/1/4
console.log(data.toLocaleTimeString())    //下午5:14:35