common_model报错： The method 'containsKey' was called on null.

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common_model报错： The method 'containsKey' was called on null.

来源：12-5 首页大接口Dao层实现和调用-2【Dao层设计】

慕UI8906940

2022-06-04

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CrazyCodeBoy

CrazyCodeBoy

2022-06-06

对json为空做下异常处理：json?.containsKey(key)

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