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今天调试课程案例时出现一个警告

react-dom.development.js:67 Warning: componentWillMount has been renamed, and is not recommended for use. See https://reactjs.org/link/unsafe-component-lifecycles for details.

• Move code with side effects to componentDidMount, and set initial state in the constructor.
• Rename componentWillMount to UNSAFE_componentWillMount to suppress this warning in non-strict mode. In React 18.x, only the UNSAFE_ name will work. To rename all deprecated lifecycles to their new names, you can run npx react-codemod rename-unsafe-lifecycles in your project source folder.

Please update the following components: TodoItem

引入了2个新的生命周期函数
static getDerivedStateFromProps and getSnapshotBeforeUpdate.

能详细讲解 componentWillMount、componentWillReceiveProps、componentWillUpdate会出现哪些问题吗