详解Vue前端对axios的封装和使用

const helper = {
 // 根据name获取地址栏的参数值
 getQueryString (name) {
  let reg = new RegExp(`(^|&)${name}=([^&])(&|$)`)
  let hash = window.location.hash
  let search = hash.split('?')
  let r = search[1] && search[1].match(reg)
  if (r != null) return r[2]; return ''
 },
 // 拼接参数至url
 queryString (url, query) {
  let str = []
  for (let key in query) {
   str.push(key + '=' + query[key])
  }
  let paramStr = str.join('&')
  return paramStr ? `${url}?${paramStr}` : url
 },
 
// 自定义判断元素类型JS
 toType(obj) {
	 return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase()
	},
// 参数过滤函数
 filterNull(o) {
	 for (var key in o) {
	  if (o[key] === null) {
	   delete o[key]
	  }
	  if (toType(o[key]) === 'string') {
	   o[key] = o[key].trim()
	  } else if (toType(o[key]) === 'object') {
	   o[key] = filterNull(o[key])
	  } else if (toType(o[key]) === 'array') {
	   o[key] = filterNull(o[key])
	  } else if (toType(o[key]) === 'number') {
	   o[key] = filterNull(o[key])
	  }
	 }
	 return o
	}

}
export default helper

import axios from 'axios'
let qs = require('querystring')
import helper from './helper'

//console.log( process.env.NODE_ENV)
//判断环境提供baseURL，注意要与后台地址一致
let root = process.env.NODE_ENV === 'development'
 // 开发环境api接口
 ?
 `http://localhost:3001/api`
 // 生产环境api接口
 :
 `http://127.0.0.1:3001/api`;
// 引用axios，设置头文件
axios.defaults.headers.post['Content-Type'] = 'application/x--form-urlencoded';


function apiAxios(method, url, params, token) {
 if (params) {
  params = helper.filterNull(params)
 }
 return axios({
  method: method,
  //拼接参数
  url: method === 'GET'|| method === 'DELETE' ? helper.queryString(url,params) : url,
  data: method === 'POST' || method === 'PUT' ? qs.stringify(params) : null,
  baseURL: root,
  timeout: 10000,
  headers: { Authorization: `Bearer ${token}` },	//jwt
  withCredentials: false
 })
}

// 返回在vue模板中的调用接口
export default {
 get: function (url, params, token) {
  return apiAxios('GET', url, params, token)
 },
 post: function (url, params, token) {
  return apiAxios('POST', url, params, token)
 },
 put: function (url, params, token) {
  return apiAxios('PUT', url, params, token)
 },
 delete: function (url, params, token) {
  return apiAxios('DELETE', url, params, token)
 },
}

import http from '../http/http.js'
export default {
 login(data, token){
  return http.post("/login",data, token)
 },
 getUserInfo(data, token){
  return http.get("/getUserInfo",data, token)
 }
}

import api from './api/api.js'
import http from './http/http.js'
//定义全局变量
Vue.prototype.$api = api

Vue.prototype.$http = http

//直接用this.$api调用api中接口，如果不封装api接口可以用this.$http
 this.$api.login(data, token).then((res) => {
	console.log(res)
 }).catch((err) => {
 	console.log(res)
 })