js实现时间显示几天前、几小时前或者几分钟前

function getTimer(stringTime){
    var minute = 1000 * 60;
    var hour = minute *60;
    var day = hour *24;
    var week = day * 7;
    var month = day * 30;

    var time1 = new Date().getTime();//当前的时间戳
    var time2 = stringTime*1000;//指定时间的时间戳
    var time = time1 - time2;

    var result = null;
    if(time < 0){
        alert("设置的时间不能早于当前时间！");
    }else if(time/month >= 1){
        result = parseInt(time/month) + "月前！";
    }else if(time/week >= 1){
        result = parseInt(time/week) + "周前！";
    }else if(time/day >= 1){
        result = parseInt(time/day) + "天前！";
    }else if(time/hour >= 1){
        result = parseInt(time/hour) + "小时前！";
    }else if(time/minute >= 1){
        result = parseInt(time/minute) + "分钟前！";
    }else {
        result = "刚刚发布！";
    }
    return result;
}