How vue3 encapsulates axios
简介
axios是一个基于promise的网络请求库,管理后台使用的场景通常 获取后端api数据,然后交给页面渲染
还是在前面的示例项目上操作,安装axios最新0.27.2版本
cd HELLO-WORLD npm install axios
openapi
在网上找到一个开放的openapi地址,免费且无需认证就可以使用
方便开发时模拟接口数据,但不能使用在生产环境中
该openapi返回json数据,比较符合我们的需求, 这里直接写死到axios配置中
基本配置
axios配置项较多,这里只配置基本功能
在src目录下创建utils文件夹,然后创建request.js文件
import axios from 'axios' //自动加在url前面 axios.defaults.baseURL = 'https://api.apiopen.top' //超时时间 axios.defaults.timeout = 5000 //跨域凭证 axios.defaults.withCredentials = false //响应和请求 拦截器配置 export default axios
拦截器
axios拦截器分为 请求拦截和响应拦截
请求拦截器可以在请求时设置token,header等等
响应拦截器可以在收到数据后进行逻辑判断
请求拦截器配置
axios.interceptors.request.use(config => { console.log(config) return config }, error => { Promise.reject(error) })
响应拦截器配置
axios.interceptors.response.use(res => { if (typeof res.data !== 'object') { ElMessage.error('返回数据不是对象!') return Promise.reject(res) } if (res.data.code !== 200 ){ ElMessage.error('返回码不等于200') } return res.data }, error => { ElMessage.error('网络异常') Promise.reject(error) })
api请求
在src目录创建api文件夹,在api目录中创建openapi.js 文件
创建一个getImages方法来 获取 openapi的图片数据
该方法指定请求get方法,传入url和参数
import request from '../utils/request' export function getImages(params) { return request.get('/api/getImages', { params }) }
数据渲染
在components目录创建一个table.vue的组件,路由配置见前一章
引入openapi,因为是js组件,不需要在vue页面显示声明,直接使用
在页面创建时调用请求数据方法,页面加载完成既可在页面上看到数据
<template> <div> <div> <p>this is imagesdata: {{ imagesData }}</p> </div> </div> </template> <script> import { getImages } from '@/api/openapi' export default { name: 'Table', data() { return { imagesData: null, queryData: { page: 0, size: 10, } } }, created() { this.fetchData(); }, methods: { fetchData() { getImages(this.queryData).then( (res) => { this.imagesData = res.result }).finally( () => { console.log(this.imagesData) }) } } } </script>
效果如下
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