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                >[success] # 巧妙的利用watch ~~~ 1.需求場景當我們觸發保存和修改事件的時候。往往會綁定同一個方法, 但通過方法中傳遞的參數不同,來觸發同一個事件的不同邏輯分支 2.根據上面的場景可以反推,整個功能變化的是傳遞的參數,因此利用 'watch' 可以監聽 屬性變化的這點,反向來觸發我們的方法 ~~~ >[danger] ##### 通過時鐘案例說明 ~~~ <template> <div> <button @click="start = !start">{{ start ? "停止" : "開始" }}</button> </div> </template> <script> import moment from "moment"; export default { data: function() { console.log("data"); this.moment = moment; this.log = window.console.log; return { now: moment(new Date()).format("YYYY-MM-DD HH:mm:ss"), start: false }; }, watch: { start() { this.startClock(); } }, beforeDestroy() { console.log("beforeDestroy"); clearInterval(this.clockInterval); }, methods: { startClock() { clearInterval(this.clockInterval); if (this.start) { this.clockInterval = setInterval(() => { this.now = moment(new Date()).format("YYYY-MM-DD HH:mm:ss"); }, 1000); } } } }; </script> ~~~
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