Vue开发之watch监听数组、对象、变量操作分析

本文实例讲述了Vue开发之watch监听数组、对象、变量操作。分享给大家供大家参考，具体如下：

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)

}
}

希望本文所述对大家vue.js程序设计有所帮助。