将字符串’2019-02-05‘转换成2019年2月5日

formDate() {
      let str = this.$user.userInfo.registerTime//一个字符串日期例如'2019-02-05'
      let regTimes = []
      if (str) {
        regTimes = str.split('-')
        if (regTimes.length === 3) {
          let year = regTimes[0]
          let month = regTimes[1]
          let date = regTimes[2]
          month = month.replace(/^0/, '')
          date = date.replace(/^0/, '')
          return year + '年' + month + '月' + date + '日'
        }
      }
      return ''
    }

let d = new Date(item.showDate)
let week = this.formatWeek(d.getDay())
  formatWeek(week){
       let weeks = {
         0: '周日',
         1: '周一',
         2: '周二',
         3: '周三',
         4: '周四',
         5: '周五',
         6: '周六'
       }
       return weeks[week]
     },

https://www.cnblogs.com/blosaa/p/3823695.htmlcss三角形