axios封装并携带自定义请求头（笔记）_const service = axios.create({ baseurl: process.en

import axios from 'axios'

// 创建axios实例
const service = axios.create({
  baseURL: process.env.BASE_API, // api的base_url
  timeout: 5000 // 请求超时时间
})

axios.defaults.headers['Content-Type'] = 'application/x-www-form-urlencoded'
service.interceptors.request.use(function (config) {

  config.headers['version'] = 'v1.0';
  if (localStorage.getItem("user-token")) {
    config.headers['user-token'] = localStorage.getItem("user-token");
  }
  if (localStorage.getItem("access-token")) {
    config.headers['access-token'] = localStorage.getItem('access-token') || '';
  }
  config.headers['plat-form'] = 2;
  return config
}, function (error) {
  return Promise.reject(error)
})

service.interceptors.response.use(function (response) {
  /**
   * 下面的注释为通过在response里，自定义code来标示请求状态
   * 当code返回如下情况则说明权限有问题，登出并返回到登录页
   * 如想通过xmlhttprequest来状态码标识 逻辑可写在下面error中
   */
    response => {
      const res = response.data
      }
    }
  // response => {
  //   const res = response.data
  //   if (res.code !== 20000) {
  //     })
  //     // 50008:非法的token; 50012:其他客户端登录了;  50014:Token 过期了;
  //     if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
  //       }).then(() => {
  //         })
  //       })
  //     }
  //     return Promise.reject('error')
  //   } else {
  //     return response.data
  //   }
  // },
  return response
}, function (error) {
  console.log('err' + error)
  Message({
    Message: error.message,
    type: 'error',
    duration: 5 * 1000
  })
  return Promise.reject(error)
})

export default {
  //get请求
  get(url, params) {
    //promise示例
    //   axios.post('/user', {
    //     firstName: 'Fred',
    //     lastName: 'Flintstone'
    //   })
    //   .then(function (response) {
    //     console.log(response);
    //   })
    //   .catch(function (error) {
    //     console.log(error);
    //   }); 
    return new Promise((resolve, reject) => {
      service({
        method: 'get',
        url,
        params,
      }).then(res => { //axios返回的是一个promise对象
        resolve(res) //resolve在promise执行器内部 
      }).catch(err => {
        console.log(err, '异常')
      })

    })
  },
  //post请求
  post(url, param) {
    return new Promise((resolve, reject) => {
      service({
        method: 'post',
        url,
        data: param,
      }).then(res => {
        resolve(res)
      }).catch(err => {
        console.log(err, '异常')
      })
    })
  }
}
export {
  post,
  get,
  service
}

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