vue 監聽data數據變化

當被監聽的數據發生變化是，函數被執行

created() {
    this.$watch("Withdrawals", function (newValue, oldValue) {
    if(this.Withdrawals==false){
    console.log("123")
        }
    })
}

data(){
  return{
    Withdrawals:false
 }
}