Virtual DOM (VDOM) It is a memory representation of the real DOM, a programming concept, and a pattern. It will be synchronized with the real DOM, such as through a library such as ReactDOM. This synchronization process is called reconciliation.
Virtual DOM is more of a pattern than a specific technology.
Function component Of course, there are differences between them and class components, and the performance of function components is higher than that of class components, because class components need to be instantiated when used, while function components can directly execute the function and return the result. To improve performance, try to use functional components.
class MyComponent extends React.Component {
constructor(props) {
super(props);
console.log(this.props); // Prints { name: 'sudheer',age: 30 }
}
}
Copy after login
不使用props:
class MyComponent extends React.Component {
constructor(props) {
super();
console.log(this.props); // Prints undefined
// But Props parameter is still available
console.log(props); // Prints { name: 'sudheer',age: 30 }
}
render() {
// No difference outside constructor
console.log(this.props) // Prints { name: 'sudheer',age: 30 }
}
}
In Some Cases, you want to pass data through the component tree without having to pass the props down manuallys at every level. you can do this directly in React with the powerful "context" API.
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