cannot read property 'then' of undefined

来源：15-4 webpack3 升级配置文件

xy36

2017-11-22

fetch/get.js文件

import 'whatwg-fetch'
import 'es6-promise'

export function get(url) {
var result = fetch(url, {
credentials: 'include',
headers: {
'Accept': 'application/json, text/plain, */*'
}
});

return result;
}

fetch/home/home.js文件

import { get } from '../get'

export function getAdData(){
const result=get('/api/homead');
return result
}

export function getListData(city,page) {
const result=get('/api/homelist/'+encodeURIComponent(city)+'/'+page);
return result
}

container/Home/Subpage/Ad.jsx文件

import React from 'react';
import PureRenderMixin from 'react-addons-pure-render-mixin'
import HomeAd from '../../../components/HomeAd/index'

import { getAdData } from '../../../fetch/home/home'

class Ad extends React.Component{
constructor(props,context) {

super(props, context);
this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
this.state={
data:[]
}
}

render(){
return(
<div>
{
this.state.data.length
?<HomeAd data={this.state.data}/>
:<div>加载中...</div>
}
</div>
)
}

componentDidMount(){
const result=getAdData();
console.log(result);
result.then(res => {
return res.json()
}).then(json => {
// console.log(json)
const data=json;
if(data.length){
this.setState({
data:data
})
}
}).catch(ex =>{
//发生错误
if(__DEV__){
console.log('首页广告模块获取数据报错，',ex.message);
}
})
}

}

export default Ad