react 定义组件内默认属性值

父组件内

import React, { Component } from 'react';
import SYSTEM from './system'
export default class Login extends Component{
    constructor(props){
        super(props)
        this.state={
        }
    }
    render(){
        return (
            <div>
                <SYSTEM name="第一"></SYSTEM>
                <SYSTEM name="第二"></SYSTEM>
                <SYSTEM></SYSTEM>
                <SYSTEM name="第四"></SYSTEM>
            </div>
        )
    }
}

子组件内

import React,{Component} from 'react'
export default class system extends Component{
    constructor(props){
        super(props)
        this.state = {}
    }
    static defaultProps = {
        name:'点击我'
    }
    render(){
        return (
            <div>
                <button>{this.props.name}</button>
            </div>
        )
    }
} 

实现效果