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                [toc] ![](https://cn.vuejs.org/images/lifecycle.png) ## 子父組件誰先觸發mounted? 子組件的`mounted`會先觸發,然后父組件的`mounted`再觸發(但這**并不**代表父組件的dom后生成) ## 數據渲染是異步的 我們在子組件中改變要渲染的數據 ![](https://box.kancloud.cn/9d23af476e4b9a4b6b17f3f7d8071ca4_531x552.png) 在父組件的mounted并不能及時的拿到重新渲染后的元素 ![](https://box.kancloud.cn/94e42659e62cbc628f5166ad00d6c90e_478x287.png) ![](https://box.kancloud.cn/50da48cfc031c0047db2978c0d6db9cf_680x351.png) 因為數據渲染是異步的,而當我們在子組件的mounted中改變數據后立馬就會執行父組件的mounted,但此時數據還并沒有開始渲染 故為了解決上面的問題 想要操作dom,最后在mounted時候使用時,加一個nextTick
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