export default function  dateFormat(format, v) {
    if (v) {
      var o = {
        "M+": v.getMonth() + 1, //月份
        "d+": v.getDate(), //日
        "h+": v.getHours() % 12 == 0 ? 12 : v.getHours() % 12, //小时
        "H+": v.getHours(), //小时
        "m+": v.getMinutes(), //分
        "s+": v.getSeconds(), //秒
        "q+": Math.floor((v.getMonth() + 3) / 3), //季度
        S: v.getMilliseconds(), //毫秒
      };
      var week = {
        0: "\u65e5",
        1: "\u4e00",
        2: "\u4e8c",
        3: "\u4e09",
        4: "\u56db",
        5: "\u4e94",
        6: "\u516d",
      };
      if (/(y+)/.test(format)) {
        format = format.replace(
          RegExp.$1,
          (v.getFullYear() + "").substr(4 - RegExp.$1.length)
        );
      }
      if (/(E+)/.test(format)) {
        format = format.replace(
          RegExp.$1,
          (RegExp.$1.length > 1
            ? RegExp.$1.length > 2
              ? "\u661f\u671f"
              : "\u5468"
            : "") + week[v.getDay() + ""]
        );
      }
      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;
    }
  }