Vue如何用watch监听数组

寻技术 VUE 2024年06月03日 45

本篇内容介绍了“Vue如何用watch监听数组”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!

1.普通的watch

data() {
  return {
    frontPoints: 0
  }
},
watch: {
  frontPoints(newValue, oldValue) {
    console.log(newValue)
  }
}

2.数组的watch:深拷贝

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
  }
}

4.对象的具体属性的watch:

data() {
  return {
    bet: {
      pokerState: 53,
      pokerHistory: 'local'
    }
  }
},
computed: {
  pokerHistory() {
    return this.bet.pokerHistory
  }
},
watch: {
  pokerHistory(newValue, oldValue) {
    console.log(newValue)
  }
}
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