react 渲染前请求ajax,react之异步请求数据，render先行渲染报错，未拿到数据

react 渲染前请求ajax,react之异步请求数据，render先行渲染报错，未拿到数据

import React from 'react'

import {connect} from 'react-redux'

import { Redirect} from 'react-router-dom'

import axios from 'axios'

import {login} from './dux.js'

//两个reducers 每个reducers都有一个state

@connect(

(state)=>state.auth,

{login}

)

class Auth extends React.Component{

constructor(props){

super(props)

this.state={

data:{},

success:false //解决方法设置一个开关，当数据请求成功，置为true

}

}

componentDidMount(){

.then(res=>{

if(res.status===200){

this.setState({data:res.data,success:true})

console.log(this.state.data[0].user)

debugger

}

})

}

render(){