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(

);
}