js根据年月日获取周几

/**
     * 根据时间（2019-12-10）获取周几
     * @param date
     * @returns {string}
     */
     getweekday(date){
      var weekArray = new Array("日", "一", "二", "三", "四", "五", "六");
      var week = weekArray[new Date(date).getDay()];//注意此处必须是先new一个Date
      return week;
    },