javascript - 为什么以及何时在 React js 中使用 componentDidMount？

Question

我正在阅读 React 教程，但我很困惑为什么使用 componentDidMount？

Answer 1

我认为documentation覆盖得足够好:

Mounting: componentDidMount

void componentDidMount()

Invoked once, only on the client (not on the server), immediately after the initial rendering occurs. At this point in the lifecycle, you can access any refs to your children (e.g., to access the underlying DOM representation). The componentDidMount() method of child components is invoked before that of parent components.

If you want to integrate with other JavaScript frameworks, set timers using setTimeout or setInterval, or send AJAX requests, perform those operations in this method.