React数据获取为什么一定要在componentDidMount里面调用

Question

React数据获取为什么一定要在componentDidMount里面调用

Answer 1

import React, { Component } from 'react';class MyCompnent extends Component {constructor(props) {super(props);this.state = {isHover: false};this.onMouseEnter = this.onMouseEnter.bind(this);}componentDidMount() {$("#aaa").on('hover', ()=> {$(this).addClass('myHover');});}onMouseEnter() {this.setState({isHover : true});}render() {const { isHover } = this.state;return();}