Vue简单封装axios之解决post请求后端接收不到参数

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--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，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);
      })
    })
  }
}

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);
}

<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>

<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>