1.前言

上篇文章写了fetch基础配置
这篇文章写写 在项目中的简要封装 其实vue和react的封装都差不多

---

2. 基础 api封装

src/api/fetch.js

//get请求封装
const fetchGet = function(url, params) {
    let list = [];
    for (let key in params) {
        let str = `${key}=${params[key]}`
        list.push(str);
    }
    const data = list.join('&');
    let allUrl = `${url}?${data}`;
    // debugger
    return fetch(allUrl).then(res => {
        return res.json();
    }).catch(err => {
        console.log(err);
    });
};
// post请求封装
const fetchPost = function(url, params) {
    let formData = new FormData();
    for (let key in params) {
        formData.append(key, params[key])
    };
    return fetch(url, {
        body: formData,
        method: 'POST'
    }).then(res => {
        return res.json();
    }).catch(err => {
        console.log(err);
    })
};
// 这个其实写不写都不行
const fetchAll = function(url, params, method='GET') {
    if (method === 'GET' || method === 'get') {
        return fetchGet(url, params);
    } 
    return fetchPost(url, params);
}
export default {
    fetchGet,
    fetchPost,
    fetchAll
}

都比较简单也没什么需要说的

---

3. 使用

import myFetch from '@/api/fetch.js';
 onMounted(()=>{
               myFetch.fetchGet("https://yzs.example.org/v1/getData",{
                   id:"yzs123"
               }).then(res => {
                    console.log(res);
                }).catch(err => {
                    console.log(err);
                })
})

---

下面的和上面的不相干 是另外一种封装方式

---

4. 整个的 fetch 环境配置

export default async(url = '', data = {}, type = 'GET', method = 'fetch') => {
    const baseUrl = "http://yzs.com"
    type = type.toUpperCase();
    url = baseUrl + url;

    if (type == 'GET') {
        let dataStr = ''; //数据拼接字符串
        Object.keys(data).forEach(key => {
            dataStr += key + '=' + data[key] + '&';
        })

        if (dataStr !== '') {
            dataStr = dataStr.substr(0, dataStr.lastIndexOf('&'));
            url = url + '?' + dataStr;
        }
    }

    if (window.fetch && method == 'fetch') {
        let requestConfig = {
            credentials: 'include',
            method: type,
            headers: {
                'Accept': 'application/json',
                'Content-Type': 'application/json'
            },
            mode: "cors",
            cache: "force-cache"
        }

        if (type == 'POST') {
            Object.defineProperty(requestConfig, 'body', {
                value: JSON.stringify(data)
            })
        }
        
        try {
            const response = await fetch(url, requestConfig);
            const responseJson = await response.json();
            return responseJson
        } catch (error) {
            throw new Error(error)
        }
    } else {
        return new Promise((resolve, reject) => {
            let requestObj;
            if (window.XMLHttpRequest) {
                requestObj = new XMLHttpRequest();
            } else {
                requestObj = new ActiveXObject;
            }

            let sendData = '';
            if (type == 'POST') {
                sendData = JSON.stringify(data);
            }

            requestObj.open(type, url, true);
            requestObj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            requestObj.send(sendData);

            requestObj.onreadystatechange = () => {
                if (requestObj.readyState == 4) {
                    if (requestObj.status == 200) {
                        let obj = requestObj.response
                        if (typeof obj !== 'object') {
                            obj = JSON.parse(obj);
                        }
                        resolve(obj)
                    } else {
                        reject(requestObj)
                    }
                }
            }
        })
    }
}

---

5. api配置

api/getData.js

/**
 * 获取导航菜单
 */
export const getHomeNavData = () => fetch('/v1/getData', {
    userId: 'yzs123456'
})
/**
 * 获取首页列表
 */
export const queryList= ( kw, type) => fetch('/v2/query',{
    kw,
    type
}, 'POST')

---

6. 使用

    import {getHomeNavData} from 'src/service/getData'
        getHomeNavData (this.userId).then(res => {
                console.log("res",res)
            })
       queryList("郑州加油","1",).then(res => {
                    console.log("REs-----------:",res)
            })

---

参考资料

fetch-MDN

初心

我所有的文章都只是基于入门，初步的了解；是自己的知识体系梳理;

如果能帮助到有缘人,非常的荣幸,一切都是为了部落的崛起

共勉