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前言

今天学习Vue官方推荐的请求工具Axios ，Axios 是一个基于 promise 的 HTTP 库，可用于浏览器和 node.js 中。它简洁、易用且功能强大，支持多种请求类型（GET、POST、PUT、DELETE 等），能够自动转换请求和响应数据（如JSON数据），并且提供了拦截请求和响应、取消请求、配置默认参数等多种功能，使得在进行 AJAX 请求时更加便捷和高效。

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一、发送get请求

不多说了，直接实战示例，多看注释：

const axios = require('axios');// Make a request for a user with a given ID
axios.get('/user?ID=12345').then(function (response) {// handle successconsole.log(response);}).catch(function (error) {// handle errorconsole.log(error);}).finally(function () {// always executed});// Optionally the request above could also be done as
axios.get('/user', {params: {ID: 12345}}).then(function (response) {console.log(response);}).catch(function (error) {console.log(error);}).finally(function () {// always executed});  // Want to use async/await? Add the `async` keyword to your outer function/method.
async function getUser() {try {const response = await axios.get('/user?ID=12345');console.log(response);} catch (error) {console.error(error);}
}

二、发送post请求

示例：

axios.post('/user', {firstName: 'Fred',lastName: 'Flintstone'}).then(function (response) {console.log(response);}).catch(function (error) {console.log(error);});//表单作为参数：const {data} = await axios.post('/user', document.querySelector('#my-form'), {headers: {'Content-Type': 'application/json'}})//执行混合的请求：function getUserAccount() {return axios.get('/user/12345');}function getUserPermissions() {return axios.get('/user/12345/permissions');}const [acct, perm] = await Promise.all([getUserAccount(), getUserPermissions()]);// ORPromise.all([getUserAccount(), getUserPermissions()]).then(function ([acct, perm]) {// ...});// 表单文件相关：Multipart (multipart/form-data)  const {data} = await axios.post('https://httpbin.org/post', {firstName: 'Fred',lastName: 'Flintstone',orders: [1, 2, 3],photo: document.querySelector('#fileInput').files}, {headers: {'Content-Type': 'multipart/form-data'}})URL encoded form (application/x-www-form-urlencoded)const {data} = await axios.post('https://httpbin.org/post', {firstName: 'Fred',lastName: 'Flintstone',orders: [1, 2, 3]}, {headers: {'Content-Type': 'application/x-www-form-urlencoded'}})

三、另一种写法

代码如下（示例）：

axios(config)
// Send a POST request
axios({method: 'post',url: '/user/12345',data: {firstName: 'Fred',lastName: 'Flintstone'}
});
// GET request for remote image in node.js
axios({method: 'get',url: 'http://bit.ly/2mTM3nY',responseType: 'stream'
}).then(function (response) {response.data.pipe(fs.createWriteStream('ada_lovelace.jpg'))});
axios(url[, config])
// Send a GET request (default method)这是最简单的默认方式，get请求
axios('/user/12345');
//Request method aliases
//For convenience aliases have been provided for all supported request methods. --别名axios.request(config)
axios.get(url[, config])
axios.delete(url[, config])
axios.head(url[, config])
axios.options(url[, config])
axios.post(url[, data[, config]])
axios.put(url[, data[, config]])
axios.patch(url[, data[, config]])
axios.postForm(url[, data[, config]])
axios.putForm(url[, data[, config]])
axios.patchForm(url[, data[, config]])

总结

Axios 因其灵活性和易用性，成为了现代前端开发中非常流行的HTTP库之一，广泛应用于各种Web项目中。今天内容比较多，需要大量时间实战测试和体会才能熟练应用。