什么是超级（道具）为我的React组件做什么？

Question

I am not great with JS and playing around with React.

The React docs located here state the following:

When implementing the constructor for a React.Component subclass, you should call super(props) before any other statement. Otherwise, this.props will be undefined in the constructor, which can lead to bugs.

My question is HOW does this actually work? What is super() doing that magically enables this.props within my constructor?

Answer 1

In the documentation that you have mentioned. It is coded in ES6 standard of javascript.

So this statement

class Greeting extends React.Component

It means Greeting is inherting from React.Component , by calling super , you are actually calling the parent element with props parameter,

if you intend on using this.props inside the constructor , you have to call super(props)

Hope these links are helpful.