时间差函数

timeDiff.js

'use strict';

/**
 * 编写timeAgo(t1,t2) 函数
 * 不用考虑闰年情况
 * 完成以下应该的输出

timeAgo('2016-01-01','2017-02-01') 								//1年前 
timeAgo('2016-01-01','2016-03-01') 								//2个月前
timeAgo('2016-01-01','2016-01-16') 							//15天前
timeAgo('2016-01-01','2016-01-01T01:13:01') 				//1小时前
timeAgo('2016-01-01','2016-01-01T00:13:01') 				//13分钟前
timeAgo('2016-01-01','2016-01-01T00:00:50') 				//50秒前

timeAgo('2018-01-01','2017-01-01') 								//1年后
timeAgo('2016-03-01','2016-01-01') 								//2个月后
timeAgo('2016-01-16','2016-01-01') 							//15天后
timeAgo('2016-01-01T01:13:01','2016-01-01') 				//1小时后
timeAgo('2016-01-01T00:13:01','2016-01-01') 				//13分钟后
timeAgo('2016-01-01T00:00:50','2016-01-01') 				//50秒后
 */
const timeAgo = function(t1, t2) { //两个时间差 中文显示函数
    t1 = new Date(t1);
    t2 = new Date(t2);
    var t = t1 - t2;
    if(t === 0) { return 0; }
    var s = (t > 0 ? (t1 - t2) : (t2 - t1))/1000;
    var boa = t > 0 ? '后' : '前';
    var m = s/60;
    var h = m/60;
    var d = h/24;
    var M = d/30;
    var y = d/365;
    var diff;
    y < 1 && M < 1 && d < 1 && h < 1 && m < 1 && (diff = Math.round(s) + '秒');
    y < 1 && M < 1 && d < 1 && h < 1 && m >= 1 && (diff = Math.round(m) + '分钟');
    y < 1 && M < 1 && d < 1 && h >= 1 && (diff = Math.round(h) + '小时');
    y < 1 && M < 1 && d >= 1 && (diff = Math.round(d) + '天');
    y < 1 && M >= 1 && (diff = Math.round(M) + '个月');
    y >=1 && (diff = Math.round(y) + '年');
    return diff + boa;
};