Vue开发中解决跨域问题

// vue.config.js
module.exports = {
    // 解决跨域 ①
    devServer: {
        // 把所有的接口代理到目标 url 下
        proxy: 'http://localhost:8080'
    }
}

// 解决跨域 ② 后端解决
res.header('Access-Control-Allow-Origin', '*')
res.header('Access-COntrol-Allow-Headers', 'X-Requested-with,Content-Type')
res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS')

Axios 配置请求拦截

// url.js
// baseURL

export const baseURL = process.env.NODE_ENV === 'production'
    ? 'http://api.production.com'  // 生产 url
    : ''  // 本地 url 配置了前端代理 ? '' : 'http://localhost:xxxx'

// axios.js
import axios from 'axios'
import { baseURL } from './url.js' 

class HttpRequest {
    constructor (baseUrl = baseURL) {  // 设置默认值
        this.baseUrl = baseUrl
        this.quene = {}  // 队列
    }
    getInsideConfig () {
        const config = {
            baseUrl: this.baseUrl,
            headers: {
                // ...
            }
        }
        return config
    }
    // 拦截器
    interceptors (instance, url) {
        instance.interceptors.request.use(config => {
            // 添加全局的loading
            if (!Object.keys(this.quene).length) {
                // Spin.show() loading
            }
            return config
        }, error => {
            return Promise.reject(error)
        })
        instance.interceptors.response.use(res => {
            delete this.quene[url]
            console.log(res)
            const { data, status } = res  
            return { data, status }
        }, err => {
            delete this.quene[url]
            return Promise.reject(err)
        })
    }
    request (options) {
        const instance = axios.create()
        options = Object.assign(this.getInsideConfig(), options)  // 合并到一个对象中
        this.interceptors(instance, options.url)
        return instance(options)
    }
}

export default HttpRequest

// index.js

import { HttpRequest } from './axios'

const axios = new HttpRequest()

export default axios

// user.js

import axios from './index'

export const getUserInfo = ({ userId }) => {
    return axios.request({
        url: '/getUserInfo',
        method: 'post',
        data: {
            userId
        }
    })
}

// home.vue

<script>
import { getUserInfo } from './user.js'
export default {
  methods: {
    getInfo() {
      getUserInfo({ userId: '1' }).then(res => {
        console.log(res)
      })
    }
  }
}
</script>