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View Code? Open in Web Editor NEW珠峰React课程第3期仓库
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第三周测试题讨论
下面我对几道测试题的理解，如果对解释有疑问，欢迎讨论。如果对其他题目有问题，也可以提出来。
第5题 答案B D（原答案有误）
A选项是可忽略= =
B选项是说组件是一个构造函数
第8题 答案 B C D
这道题C选项的本意是如果你用Component定义组件，并且调用constructor的话，必须使用super()。 这本身是没有问题的。当然会有歧义，因为你当然也可以不调用constructor。这一题大家掌握这个知识点就好，文字表述上就不要太纠结了。
第10题 答案A C（原答案有误）
第11题 答案A C
主要还是考察生命周期的执行顺序。关于B选项，如果shouldComponentUpdate返回的是false，那componentWillUpdate就不会被调用。
第12题 答案A D （原答案有误）
唯一要注意的是A选项中ref是不能写到用functional components（也就是用function方式定义的组件）上的。 参考链接
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