TypeError: Cannot read property 'map' of null
刚开始以为是前端的问题，检查过很多次之后还是找不到问题在哪，后来去检查了一下后端的代码，发现是后端的问题，因为后端的查询代码return null了，更改之后发现没有错误 了。 总结，像map这样的问题，一般情况下后端出问题也会影响它的，所以要仔细检查，在敲的时候一定要仔细，仔细，再仔细！本人已经经受太多的粗心导致的问题了,希望对大家有帮助！
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