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                計算屬性&監聽器 === - 計算數學:computed - 監聽器:watch ### 使用場景 watch 對于某一個元素的監聽 (異步場景) computed會監聽全局變化 (數據聯動) ~~~ <div id="app"> {{msg}} <br> {{msg1}} </div> <script> let app = new Vue({ el:"#app", data:{ msg: "hello vue", ano:"ano vue" }, watch:{ // 當msg的值發生變化的時候就會執行 msg:function (newval,oldval) { console.log("newVal: ",newval) console.log("oldVal: ",oldval) } }, computed:{ msg1:function () { return "computed: " + this.msg + this.ano } } }) </script> ~~~
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