[listening for an attribute in the array]

【 Listening for an attribute in the array 】

One 、 structure

  computed : {
    amount : function () {
       JSON.parse(JSON.stringify(this.linke.newList))

       JSON.parse(JSON.stringify(this.linke.oldList))
       return
    }
  },
  watch : {
    amount : {
      handler (newVal) {
        // console.log(newVal , 'newVal')
        // console.log(oldVal , 'oldVal')
        let aaa  = this.linke.oldList.reduce((sum, e) => sum + Number(e.amount || 0), 0)
        let bbb  = this.linke.newList.reduce((sum, e) => sum + Number(e.amount || 0), 0)
        this.CardrftNo = this.linke.oldList.length + this.linke.newList.length
        this.CardrftNoMoney = aaa + bbb
      } ,
      immediate : false,
      deep: true
    }
  },