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Uncaught (in promise) TypeError: Cannot read property 'data' of undefined
時間 2021-01-04
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React
Redux
fetch
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React
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最近在學習Redux的時,自己寫了個Demo,用fetch異步調用接口時返回這個腦殼疼的問題。 問題: 問題排查: 一步一步在控制檯打印,並檢測類型,發現控制檯打印undefined,才意識到第二個then方法未接收到上個then的返回值,原來是箭頭函數這塊出的問題,使用箭頭函數時傳入一個參數並返回一個參數時,()與return是可以省略的,此處是一個表達式,需要用return返回纔有效,老是健忘
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