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
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