關於Vue報錯（Property or method “xxx“ is not defined on the instance but referenced during render.）防踩坑

阿新 • • 發佈：2022-04-18

今天記錄一下這個問題，在用vue寫前端，在頁面取值的時候，發現控制檯一直報錯

控制檯報錯資訊：

錯誤資訊：屬性或方法“peoples”不是在例項上定義的，而是在渲染過程中被引用的。通過初始化屬性，確保此屬性是反應性的，無論是在資料選項中，還是對於基於類的元件。

所以，由此我們就知道了，在vue的template中我們使用了peoples資料，但是在data中還並沒有被定義，就被使用了，造成了這個錯誤。在data中定義一下這個peoples的資料，就可以解決這個問題了。

前端程式碼：

呼叫資料方法：

資料存放 data ：

在這個問題中，因為peoples和formData是不同的資料來源，peoples不屬於formData，因此不能寫在它的裡面，所以應該更改為

這樣子就可以正常獲得我們所需要的資料，頁面就可以正常顯示了

如果還是有問題的話，就在元件前面或者本身加一個v-if，讓data渲染完成再執行

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