[JavaScript知识库]vue-admin-element utils/request.js

request库源码分析

首先要学习一下axios http://www.axios-js.com/zh-cn/docs/

还有一些element-ui的组件 https://element.eleme.cn/#/zh-CN/component/message-box#messagebox-dan-kuang

utils/request.js

这个地方导出的是service

在src/api/user当中，导入的实际上就是这个service,只是给他起了个名字叫request

请求拦截器

  config => {
    // do something before request is sent
    // 判断vuex中的token是否存在 
    // 存在的话就放在http header当中的X-Token
    // 就是说在header中加了个X-Token
    if (store.getters.token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['X-Token'] = getToken()
    }
    return config
  },

验证一下

然后错误也是交给catch来处理

  error => {
    // do something with request error
    console.log(error) // for debug
    return Promise.reject(error)
  }

响应拦截器

逻辑就是判断是不是20000 不是20000再细分 判断是否失效

到最后也是 return Promise.reject(error) 交给我们自行处理

service.interceptors.response.use(
  response => {
    const res = response.data
    // if the custom code is not 20000, it is judged as an error.
    if (res.code !== 20000) {
      Message({
        message: res.message || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
        // to re-login
        MessageBox.confirm('You have been logged out, you can cancel to stay on this page, or log in again', 'Confirm logout', {
          confirmButtonText: 'Re-Login',
          cancelButtonText: 'Cancel',
          type: 'warning'
        }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.message || 'Error'))
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error) // for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)