import axios from 'axios' //引入

//Vue.use(axios) axios不能用use 只能修改原型链 
Vue.prototype.$axios = axios

//不带参数的get请求

let url = "..."
this.$axios.get(url)
.then((res) => {
 console.log(res) //返回的数据
})
.catch((err) => {
 console.log(err) //错误信息
})

//带参数的get请求

let url = "...getById"
this.$axios.get(url, {
 params: {
  id: 1
 }
})
.then((res) => {
 console.log(res) //返回的数据
})
.catch((err) => {
 console.log(err) //错误信息
})

//带参数的post请求

let url = "...getById"
let data = {
 id: 1
}

this.$axios.post(url, data)
.then((res) => {
 console.log(res) //返回的数据
})
.catch((err) => {
 console.log(err) //错误信息
})

this.$axios({
 method: 'post',
 url: '...',
 data: {
 firstName: 'Fred',
 lastName: 'Flintstone'
 }
}).then((res) => {
 console.log(res)
})

import axios from "axios" //引入

//设置axios为form-data
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';
axios.defaults.headers.get['Content-Type'] = 'application/x-www-form-urlencoded';
axios.defaults.transformRequest = [function (data) {
 let ret = ''
 for (let it in data) {
  ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&'
 }
 return ret
}]


//然后再修改原型链
Vue.prototype.$axios = axios