时间对象的格式化

value 时间戳
format 格式 'mm’到小时 'ss’到秒，不填默认返回到天
connector 连接符 不填默认为 ‘-’
{string}

timeFormat: function (value, format, connector) {

      var date = new Date(value);
      var yy = date.getFullYear();
      var MM = date.getMonth() + 1;
      var dd = date.getDate();
      var hh = date.getHours();
      var mm = date.getMinutes();
      var ss = date.getSeconds();
      var link = '-';
      connector ? link = connector : link = '-';
      if (MM < 10)
        MM = "0" + MM;
      if (dd < 10)
        dd = "0" + dd;
      if (hh < 10)
        hh = "0" + hh;
      if (mm < 10)
        mm = "0" + mm;
      if (ss < 10)
        ss = "0" + ss;
      if (format === 'mm') {
        return "" + yy + link + MM + link + dd + " " + hh + ":" + mm;
      } else if (format === 'ss') {
        return "" + yy + link + MM + link + dd + " " + hh + ":" + mm + ":" + ss;
      } else {
        return "" + yy + link + MM + link + dd;
      }
    },