1.watch監聽普通類型的數據:
data() { return { frontPoints: 0 } }, watch: { frontPoints(newValue, oldValue) { console.log(newValue) } }
2.watch監聽數組類型 的數據
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.watch監聽對象類型的數據
data() { return { bet: { pokerState: 53, pokerHistory: 'local' } } }, watch: { bet: { handler(newValue, oldValue) { console.log(newValue) }, deep: true } }
4.watch監聽對象的具體屬性:(結合computed)
data() { return { bet: { pokerState: 53, pokerHistory: 'local' } } }, computed: { pokerHistory() { return this.bet.pokerHistory } }, watch: { pokerHistory(newValue, oldValue) { console.log(newValue) } }