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