vue watch数组或者对象

vue

data() {

return {

frontPoints: 0

}

},

watch: {

frontPoints(newValue, oldValue) {

console.log(newValue)

}

}

2、数组的watch

data() {

return {

winChips: new Array(11).fill(0)

}

},

watch: {

  winChips: {

    handler(newValue, oldValue) {

      for (let i = 0; i < newValue.length; i++) {

        if (oldValue[i] != newValue[i]) {

          console.log(newValue)

        }

      }

    },

    deep: true

  }

}

3、对象的watch

data() {

  return {

    bet: {

      pokerState: 53,

      pokerHistory: 'local'

    }

}

},

watch: {

  bet: {

    handler(newValue, oldValue) {

      console.log(newValue)

    },

    deep: true

  }

}

tips: 只要bet中的属性发生变化(可被监测到的),便会执行handler函数;如果想监测具体的属性变化,如pokerHistory变化时,才执行handler函数,则可以利用计算属性computed做中间层。事例如下:
4、对象具体属性的watch[活用computed]

data() {

  return {

    bet: {

      pokerState: 53,

      pokerHistory: 'local'

    }

}

},

computed: {

  pokerHistory() {

    return this.bet.pokerHistory

  }

},

watch: {

  pokerHistory(newValue, oldValue) {

    console.log(newValue)

  }

}

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