10-构造函数加不加props

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加与不加props的区别究竟在哪里呢？

以下来自stackoverflow的解释：

What’s the difference between “super()” and “super(props)” in React when using es6 classes?

不加props

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constructor(props) {
    super();
    console.log(this.props) //undefined
}

加props

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constructor(props) {
    super(props);
    console.log(this.props) //props will get logged.
}