小Demo,

后面会进行拓展的

import React from 'react';
import ReactDOM from 'react-dom';

class Welcome extends React.Component {
    render() {
        return <h1>Hello, {this.props.name} </h1>
    }
}

const element = <Welcome name="Draymonder" />

ReactDOM.render(
    element, document.getElementById("root"));

参考文档

React组件生命周期