通讯解决方案

2021-4-20 javaScript
  1. 安装 axios、qs
npm install qs axios --save
  1. src目录下新建http.js
  • axios
import axios from 'axios';
import qs from 'qs';

const isPlainObject = function isPlainObject(obj) {
    let proto, Ctor;
    if (!obj || Object.prototype.toString.call(obj) !== "[object Object]") return false;
    proto = Object.getPrototypeOf(obj);
    if (!proto) return true;
    Ctor = proto.hasOwnProperty('constructor') && proto.constructor;
    return typeof Ctor === "function" && Ctor === Object;
};

// 会基于NODE环境变量,配置不同的BASEURL地址
axios.defaults.baseURL = 'http://127.0.0.1:9999';
axios.defaults.timeout = 10000;
axios.defaults.withCredentials = true;
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';
axios.defaults.transformRequest = function (data) {
    if (!isPlainObject(data)) return data;
    return qs.stringify(data);
};
axios.interceptors.request.use(config => {
    let token = localStorage.getItem('token');
    if (token) config.headers['Authorization'] = token;
    return config;
});
axios.interceptors.response.use(function onfulfilled(response) {
    return response.data;
}, function onrejected(reason) {
    // @1 服务器返回信息,状态码不是以2开始
    if (reason.response) {
        switch (reason.response.status) {
            case 400:
                // ...
                break;
        }
    }

    // @2 服务器没有返回的信息「请求超时或者中断」
    if (reason.code === "ECONNABORTED") {
        // ...
    }

    // @3 服务器没有返回的信息「断网了」
    if (!navigator.onLine) {
        // ...
    }

    return Promise.reject(reason);
});

export default axios;
  • Fetch
import qs from 'qs';
const isPlainObject = function isPlainObject(obj) {
    let proto, Ctor;
    if (!obj || Object.prototype.toString.call(obj) !== "[object Object]") return false;
    proto = Object.getPrototypeOf(obj);
    if (!proto) return true;
    Ctor = proto.hasOwnProperty('constructor') && proto.constructor;
    return typeof Ctor === "function" && Ctor === Object;
};

let baseURL = 'http://127.0.0.1:9999',
    inital = {
        method: 'GET',
        params: null,
        body: null,
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
        }
    };

export default function request(url, config) {
    if (typeof url !== "string") throw new TypeError('url must be required!');
    if (!isPlainObject(config)) config = {};
    if (config.headers) {
        if (!isPlainObject(config.headers)) config.headers = {};
        config.headers = Object.assign({}, inital.headers, config.headers);
    }
    let {
        method,
        params,
        body,
        headers
    } = Object.assign({}, inital, config);

    // 处理URL
    if (!/^http(s?):\/\//i.test(url)) url = baseURL + url;
    if (params != null) {
        if (isPlainObject(params)) params = qs.stringify(params);
        url += `${url.includes('?')?'&':'?'}${params}`;
    }

    // 处理请求主体
    let isPost = /^(POST|PUT|PATCH)$/i.test(method);
    if (isPost && body != null && isPlainObject(body)) {
        body = qs.stringify(body);
    }

    // 发送请求
    config = {
        method: method.toUpperCase(),
        headers
    };
    if (isPost) config.body = body;
    return fetch(url, config).then(response => {
        // 只要服务器有返回值,则都认为promise是成功的,不论状态码是啥
        let {
            status,
            statusText
        } = response;
        if (status >= 200 && status < 300) {
            // response.json():把服务器获取的结果变为json格式对象,返回的一个promise实例
            return response.json();
        }
        return Promise.reject({
            code: 'STATUS ERROR',
            status,
            statusText
        });
    }).catch(reason => {
        // @1 状态码错误
        if (reason && reason.code === "STATUS ERROR") {
            // ...
        }

        // @2 断网
        if (!navigator.onLine) {
            // ...
        }

        return Promise.reject(reason);
    });
};
  1. src目录下新建index.js
import axios from './http';
import request from './http2';

const queryUserInfo = userId => {
    /*  return axios.get('/user/info', {
         params: {
             userId
         }
     }); */
    return request('/user/info', {
        params: {
            userId
        }
    });
};

const setUserLogin = (account, password) => {
    /* return axios.post('/user/login', {
        account,
        password
    }); */
    return request('/user/login', {
        method: 'POST',
        body: {
            account,
            password
        }
    });
};

export default {
    queryUserInfo,
    setUserLogin
};
  1. main.js引用
import Vue from 'vue';
import App from './App.vue';
import api from './api/index';

Vue.config.productionTip = false;
Vue.prototype.$api = api;

new Vue({
  render: h => h(App)
}).$mount('#app');

/*
   $.ajax  导入JQ   基于回到函数管理的
       $.ajax({
          url:'/api/list',
          success(result){
              
          }
       });
   axios 下载安装这个模块   基于Promise封装的ajax库
       axios.get('/api/list').then(result=>{
          return axios.get('/api/info');
       }).then(result=>{
          
       });
   ------上述两种办法都是基于 XMLHttpRequest 方案完成的

   fetch 直接用(ES6),本身就是基于Promise管理的,和XMLHttpRequest没有任何关系,是浏览器新提供的一种前后端数据通信方案
    https://developer.mozilla.org/zh-CN/docs/Web/API/Fetch_API/Using_Fetch
 */
Last Updated: 2021-04-26 14:38:08