react项目请求数据的fetch的使用

准备三个文件(封装请求函数),然后测试一下，能不能调用数据

第一个文件  request.js

import 'whatwg-fetch';
 
/**
 * Parses the JSON returned by a network request
 *
 * @param  {object} response A response from a network request
 *
 * @return {object}          The parsed JSON from the request
 */
function parseJSON(response) {
    if (response.status === 204 || response.status === 205) {
        return null;
    }
    return response.json();
}
 
/**
 * Checks if a network request came back fine, and throws an error if not
 *
 * @param  {object} response   A response from a network request
 *
 * @return {object|undefined} Returns either the response, or throws an error
 */
function checkStatus(response) {
    if (response.status >= 200 && response.status < 300) {
        return response;
    }
 
    const error = new Error(response.statusText);
    error.response = response;
    throw error;
}
 
/**
 * Requests a URL, returning a promise
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 *
 * @return {object}           The response data
 */
export default function request(url, options) {
    return fetch(url, options)
        .then(checkStatus)
        .then(parseJSON);
}

第二个文件  jshNetwork.js

/**
 * Created by 23hp on 2017/4/13.
 * 基于Promise的网络请求库,包含GET POST请求，上传下载功能
 * 使用方法：
 * 先引入： import {get,post,...} from 本文件;
 * · get请求:    get("http://api.lolatc.com/v1",{id:2}).then(data=>{}).catch(error=>{});
 * · post请求:    post("http://api.lolatc.com/v1",{id:2}).then(data=>{}).catch(error=>{});
 *  then方法里的参数第一个是成功回调，第二个是失败回调，两个回调都是可选的
 */
import request from './request';
 
/**
 * 发送get 请求
 * @param url  路径 必填
 * @param headers 请求头参数 可选
 */
export function get(url, headers = { 'Content-Type': 'application/json' }) {
    return request(url, {
        method: 'GET',
        headers,
    });
}
/**
 * 发送POST请求
 * @param url 路径 必填
 * @param param 参数 可选
 * @param headers 请求头参数 可选
 */
export function post(url, param, headers = { 'Content-Type': 'application/json' }) {
    return request(url, {
        method: 'POST',
        headers,
        body: JSON.stringify(param),
    });
}

第三个文件   service.js

import { post } from './jshNetwork.js';
 
export function getProductList(getParam) {
    const params = {
        doctype: '51etm',
        page_size: 5,
        page: 1,
        clttype: 'decoration',
        isLogin: '2',
        matgroup: '瓷砖',
        stcode: '',
        sales: 'desc'
    };
    const url = 'https://java-getway-stg.heyiit.com/java-getway/apigateway/api.do?api_path=/lola_cms_Interface/rc_manage/selectBy_Condition_and_TimatGeneral.do&flagForAddress=rc_cms';
    return post(url, params);
}

第四个文件请求调用数据

import React, { Component } from 'react';
import 'antd-mobile/dist/antd-mobile.css';
import {getProductList} from "../utils/service";
import {Button} from "antd-mobile";
 
class qqq extends Component {
    buttonRequest = () => {
        getProductList().then((data)=>{
            console.log("data",data);
        });
    }
    render() {
        return (
            <div style={{ paddingTop:"200px" }}>
                <Button type="primary" onClick={this.buttonRequest}>首页按钮</Button>
            </div>
        );
    }
}
 
export default qqq;

这样，测试成功。