本文實(shí)例講述了Vue開發(fā)之watch監(jiān)聽數(shù)組、對象、變量操作。分享給大家供大家參考,具體如下:
1.普通的watch
data() { return { frontPoints: 0 } }, watch: { frontPoints(newValue, oldValue) { console.log(newValue) } }
2.數(shù)組的watch:深拷貝
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.對象的watch
data() { return { bet: { pokerState: 53, pokerHistory: 'local' } } }, watch: { bet: { handler(newValue, oldValue) { console.log(newValue) }, deep: true } }
4.對象的具體屬性的watch:
data() { return { bet: { pokerState: 53, pokerHistory: 'local' } } }, computed: { pokerHistory() { return this.bet.pokerHistory } }, watch: { pokerHistory(newValue, oldValue) { console.log(newValue) } }
希望本文所述對大家vue.js程序設(shè)計有所幫助。
聲明:本網(wǎng)頁內(nèi)容旨在傳播知識,若有侵權(quán)等問題請及時與本網(wǎng)聯(lián)系,我們將在第一時間刪除處理。TEL:177 7030 7066 E-MAIL:11247931@qq.com