Vue简单封装axios—解决post请求后端接收不到参数问题

1.在src/下新建api文件夹，api/下新建index.js和public.js

在public.js中：

import axios from 'axios';
import qs from 'qs'
import router from '../router'
import { MessageBox} from 'mint-ui'

// 注意点,按照以下写
var instance = axios.create();
instance.defaults.timeout = 10000;
instance.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

export default {
    fetchGet(url, params = {}) {
        return new Promise((resolve, reject) => {
            axios.get(url, params).then(res => {
                if(res.data.code === 302) {
                    MessageBox('提示', '登录失效,请重新登录');
                    MessageBox.alert('登录失效,请重新登录', '提示').then(action => {   
                        router.push("/login");
                    });
                }
                resolve(res.data);
            }).catch(error => {
                reject(error);
            })
        })
    },
    fetchPost(url, params = {}) {
        /*  
        axios post请求后端接收不到参数问题：

        解决方案一：有效，但是兼容性不是很好，不是所有浏览器都支持
            let data = new URLSearchParams()
            for (var key in params) {
                data.append(key, params[key])
            }
        */
        
        // 解决方案二：使用qs模块(axios中自带),使用qs.stringify()序列化params
        return new Promise((resolve, reject) => {
            axios.post(url, qs.stringify(params)).then(res => {
                resolve(res.data);
            }).catch(error => {
                reject(error);
            })
        })
    }
}

2.在index.js中：

import http from './public'

export const getStation = (params) => {
    return http.fetchGet('/hydro/rest/getBelongUser', params);
}

export const userLogin = (params) => {
    return http.fetchPost("/hydro/rest/login", params);
}

3.在Login.vue中调用post请求方法:

<template>
    <div class="login">
        <h1>登录页面</h1>
        <input type="text" placeholder="请输入用户名" v-model="Username">
        <input type="password" placeholder="请输入密码" v-model="Password">
        <input type="button" value="登录" @click="toLogin">
    </div>
</template>

<script>
import {userLogin} from "../../api/index"

export default {
  name: 'app',
  data() {
    return {
      Username: "",
      Password: ""
    }
  },
  methods: {
    toLogin() {
        let params = {
            username: this.Username,
            password: this.Password
        };
  
        userLogin(params).then(res => {
            if(res.code === 200) {
                this.$router.push("/home")
            }
        })
    }
  }
}
</script>

#### 4.在Home.vue调用get请求方法

<template>
    <h1 class="home">
        {{stationName}}
    </h1>
</template>

<script>
import {getStation} from "../../api/index"

export default {
    data() {
        return{
            stationName: ""
        }
    },
    created() {
        getStation().then(res => {
            this.stationName = res.msg;
        })
    }
}
</script>