优化多if和else语句

可以利用对象来进行映射

比如

      let type = this.radio_value
      if (type === 'whole') {
        this.time_value = []
      } else if (type === 'today') {
        this.time_value = [this.getDay(0, '-'), this.getDay(1, '-')]
      } else if (type === 'yesterday') {
        this.time_value = [this.getDay(-1, '-'), this.getDay(0, '-')]
      } else if (type === 'last_seven_days') {
        this.time_value = [this.getDay(-7, '-'), this.getDay(0, '-')]
      } else if (type === 'last_thirty_days') {
        this.time_value = [this.getDay(-30, '-'), this.getDay(0, '-')]
      }

可以优化成

      let type = this.radio_value
      let map = {
        'whole':()=>this.time_value = [],
        'today':()=>this.time_value = [this.getDay(0, '-'), this.getDay(1, '-')],
        'yesterday':()=>this.time_value = [this.getDay(-1, '-'), this.getDay(0, '-')],
        'last_seven_days':()=>this.time_value = [this.getDay(-7, '-'), this.getDay(0, '-')],
        'last_thirty_days':()=>this.time_value = [this.getDay(-30, '-'), this.getDay(0, '-')],
      }
      if(map[type]){
        map[type]()
      }