setFormFieldsExchange(newVal) {
      let index = 0
      let row = []
      let _this = this
      _this.formFieldsExchange =[]
      newVal.filter((u) => u.isEdit)
      .sort((a, b) => b.sort - a.sort)
      .forEach((item) => {
        row.push(item)
        index++

        if (index >= _this.colNum) {
          index = 0
          _this.formFieldsExchange.push(row)
          row = []
        }
      })
      //添加这句！！！！！！！！！！！！！
      if(row.length > 0) { 
        _this.formFieldsExchange.push(row)
      }
    },