react访问并使用mock数据

1. 在create-react-app之后会自动生成一个public文件夹，这个文件夹地址是可以直接使用的
2. 将mock文件夹创建在public文件夹下
3. 在mock文件夹下创建orders.json文件
   orders.json

[
  {
    "id": 1,
    "shop": "创意菜",
    "picture": "https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3139953554,3011511497&fm=26&gp=0.jpg",
    "product": "百香果（冷饮）1扎",
    "price": 19.9,
    "ifCommented": true
  },
  {
    "id": 2,
    "shop": "舌尖美味",
    "picture": "https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=3092870924,3996642384&fm=26&gp=0.jpg",
    "product": "烧仙草（热饮）1杯",
    "price": 29.9,
    "ifCommented": false
  },
  {
    "id": 3,
    "shop": "正一品",
    "picture": "https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1405792724,2993817143&fm=26&gp=0.jpg",
    "product": "红豆奶茶（热饮）1杯",
    "price": 9.9,
    "ifCommented": false
  },
  {
    "id": 4,
    "shop": "冰感触觉",
    "picture": "https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3203140906,2015178347&fm=26&gp=0.jpg",
    "product": "奶盖（冷饮）1杯",
    "price": 19.9,
    "ifCommented": false
  }
]

orderList.js

import React,{Component} from 'react';
import OrderItem from '../OrderItem';

class OrderList extends Component{
    constructor(props){
        super(props);
        this.state = {
            data:[]
        };
    }

    componentDidMount(){
        fetch('./mock/orders.json').then(res => {
            if(res.ok){
                res.json().then(data => {
                    this.setState({
                        data
                    })
                })
            }
        })
    }
    render(){
        return(
            

                {
                    this.state.data.map(item => {
                        return 
                    })
                }
            
        );
    }
}
export default OrderList;

orderItem.js

import React,{Component} from 'react';
import './index.css'
class OrderItem extends Component{
    render(){
        const {shop, product, price, picture, ifCommented} = this.props.data;
        return(
            

                

                    
                
                

                    
{product}
                    
{shop}
                    

                        
{price}
                        

                            {ifCommented ? (
                                已评价

                            ):(
                                评价
                            )}

                        
                    
                
            
        );
    }
}
export default OrderItem;

app.js

import React from 'react';
import logo from '../../logo.svg';
import './index.css';
import OrderList from '../OrderList'
import Header from'../Header'

function App() {
  return (
    

        

      
    
  );
}

export default App;

index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
**import App from './components/App';**
import * as serviceWorker from './serviceWorker';

ReactDOM.render(, document.getElementById('root'));

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: https://bit.ly/CRA-PWA
serviceWorker.unregister();

header.js

import React ,{Component} from 'react';
import './index.css'

class Header extends Component{
    render() {
        return (
            

                我的订单
            
        )
    }
}

export default Header;

app.css

.App {
  text-align: center;
}

.App-logo {
  animation: App-logo-spin infinite 20s linear;
  height: 40vmin;
  pointer-events: none;
}

.App-header {
  background-color: #282c34;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  color: white;
}

.App-link {
  color: #61dafb;
}

@keyframes App-logo-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

header.css

.header{
    background-color: #e9203d;
    color:white;
    padding: 15px 10px;
    text-align: center;
    font-size: 16px;
    line-height: 1;
}

orderItem.css

.orderItem_picContainer{
    display: inline-block;
    width:100px;
    height:100px;
    border:1px solid #eee;
    float: left;
    margin:6px;
    box-sizing: border-box;
}
.orderItem_pic{
    width:100px;
    height:100px;
}
.orderItem_content{
    display: inline-block;
    float: left;
    width:62%;
    margin-left: 10px;
}
.orderItem_product{
    margin-top: 30px;
    font-size:1.2rem;
    font-weight:700;
}
.orderItem_shop{
    margin:5px auto;
    font-size:0.8rem;
    color:grey;
}
.orderItem_detail{
    height:30px;
    line-height:30px;
}
.orderItem_price{
    font-size:0.8rem;
    color:#777;
    vertical-align: 1px;
    margin-left: 10px;
    display: inline-block;
    float: left;
}
.orderItem_price::before{
    content: '\00A5';
    margin-right: 1px;
}
.orderItem_btn{
    display:inline-block;
    float:right;
    width:60px;
    height:30px;
    border:0;
    color: white;
    outline: none;

}
.orderItem_btn_red{
    background:red;
}
.orderItem_btn_grey{
    background:grey;
}

目录结构如图所示：

错了，再来

实现效果如图所示：