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uniapp官网提供了三种方式：什么是跨域 | uni-app官网

1. 通过uniapp自带浏览器 打开项目是不存在跨域的

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第二种方式： 

"h5" : {"template" : "static/index.html","devServer": {"proxy": {"/api": {"target": "http://192.168.31.162:8288","changeOrigin": true}}},"router" : {"mode" : "hash", // 路由模式"base" : "./"},"sdkConfigs" : {"maps" : {"amap" : {"key" : "ca8cde9d6d4d6658826713d31d3df9c2","securityJsCode" : "","serviceHost" : ""}}}}

uniapp 请求封装

import store from '@/store'
import config from '@/config'
import { getToken } from '@/utils/auth'
import errorCode from '@/utils/errorCode'
import { toast, showConfirm, tansParams } from '@/utils/common'let timeout = 10000
const baseUrl = config.baseUrlconst request = config => {// 是否需要设置 tokenconst isToken = (config.headers || {}).isToken === falseconfig.header = config.header || {}if (getToken() && !isToken) {config.header['Authorization'] = 'Bearer ' + getToken()}// get请求映射params参数if (config.params) {let url = config.url + '?' + tansParams(config.params)url = url.slice(0, -1)config.url = url}return new Promise((resolve, reject) => {uni.request({method: config.method || 'get',timeout: config.timeout ||  timeout,url: config.baseUrl || baseUrl + config.url,data: config.data,header: config.header,dataType: 'json'}).then(response => {let [error, res] = responseif (error) {toast('后端接口连接异常')reject('后端接口连接异常')return}const code = res.data.code || 200const msg = errorCode[code] || res.data.msg || errorCode['default']if (code === 401) {showConfirm('登录状态已过期，您可以继续留在该页面，或者重新登录?').then(res => {if (res.confirm) {store.dispatch('LogOut').then(res => {uni.reLaunch({ url: '/pages/login' })})}})reject('无效的会话，或者会话已过期，请重新登录。')} else if (code === 500) {toast(msg)reject('500')} else if (code !== 200) {toast(msg)reject(code)}resolve(res.data)}).catch(error => {let { message } = errorif (message === 'Network Error') {message = '后端接口连接异常'} else if (message.includes('timeout')) {message = '系统接口请求超时'} else if (message.includes('Request failed with status code')) {message = '系统接口' + message.substr(message.length - 3) + '异常'}toast(message)reject(error)})})
}export default request