常用的时间处理（Date => String）

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var timer = {     /**      * 补足 0      * @param { Number | String } num      * @returns { String }      */     padLeftZero: function(num) {         // es6 中可用 padStart() 来完成补足         return ('0' + num).slice(-2);     },       /**      * 处理成想要的日期字符串      * @param { Date | String} date      * @param { String } formate      * @returns { String }      */     handle2String: function(date, formate) {         if (date === null || date.length === 0) return '';                   var tempDate = new Date(date);           if (/(y+)/.test(formate)) formate = formate.replace(RegExp.$1, (tempDate.getFullYear() + '').substring(4 - RegExp.$1.length));                   var o = {             'M+': tempDate.getMonth() + 1,             'd+': tempDate.getDate(),             'h+': tempDate.getHours(),             'm+': tempDate.getMinutes(),             's+': tempDate.getSeconds(),         }           for (var key in o) {             if (!o.hasOwnProperty(key)) continue;               if (new RegExp(`(${key})`).test(formate)) formate = formate.replace(RegExp.$1, this.padLeftZero(o[key]));         }           return formate;     } }