js 继承date添加格式化

Date.prototype.format = function (format) { var o = { "M+": this.getMonth() + 1, // mo

Date.prototype.format = function (format) {      var o = {          "M+": this.getMonth() + 1, // month          "d+": this.getDate(), // day          "h+": this.getHours(), // hour          "m+": this.getMinutes(), // minute          "s+": this.getSeconds(), // second          "q+": Math.floor((this.getMonth() + 3) / 3), // quarter          "S": this.getMilliseconds()          // millisecond      }      if (/(y+)/.test(format))          format = format.replace(RegExp.$1, (this.getFullYear() + "")              .substr(4 - RegExp.$1.length));      for (var k in o)          if (new RegExp("(" + k + ")").test(format))              format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));      return format;  }