TypeError: Cannot read property 'map' of null
剛開始以爲是前端的問題，檢查過很多次之後還是找不到問題在哪，後來去檢查了一下後端的代碼，發現是後端的問題，因爲後端的查詢代碼return null了，更改之後發現沒有錯誤 了。 總結，像map這樣的問題，一般情況下後端出問題也會影響它的，所以要仔細檢查，在敲的時候一定要仔細，仔細，再仔細！本人已經經受太多的粗心導致的問題了,希望對大家有幫助！
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