微信小程序封装网络请求和拦截器实战步骤

function request(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: options.method || 'GET',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}

function checkStatus(response) {
  const { statusCode, data } = response
  if (statusCode >= 200 && statusCode < 300) {
    return Promise.resolve(data)
  } else {
    const error = new Error(`请求失败，状态码：${statusCode}`)
    error.response = response
    throw error
  }
}

function interceptor(chain) {
  const requestInterceptor = (options) => {
    // 设置请求头
    options.header.Authorization = 'Bearer ' + getApp().globalData.token
    return chain.request(options)
  }
  const responseInterceptor = (response) => {
    const { statusCode, data } = response
    if (statusCode >= 200 && statusCode < 300) {
      // 更新用户登录信息
      getApp().globalData.userInfo = data.userInfo
    } else {
      const error = new Error(`请求失败，状态码：${statusCode}`)
      error.response = response
      throw error
    }
    return response
  }
  return {
    request: requestInterceptor,
    response: responseInterceptor
  }
}

//封装put请求方式的代码如下：
function put(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: 'PUT',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}
//封装delete请求方式的代码如下：
function del(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: 'DELETE',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}
//封装post请求方式的代码如下：
function post(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: 'POST',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}

App({
  globalData: {
    userInfo: null,
    token: null
  }
})

// request.js
function request(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: options.method || 'GET',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}
function put(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: 'PUT',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}
function del(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: 'DELETE',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}
function post(options) {
  return new Promise((resolve, reject) => {
    wx.request({
      url: options.url,
      method: 'POST',
      data: options.data || {},
      header: options.header || {},
      success: resolve,
      fail: reject
    })
  })
}
function checkStatus(response) {
  const { statusCode, data } = response
  if (statusCode >= 200 && statusCode < 300) {
    return Promise.resolve(data)
  } else {
    const error = new Error(`请求失败，状态码：${statusCode}`)
    error.response = response
    throw error
  }
}
function interceptor(chain) {
  const requestInterceptor = (options) => {
    options.header.Authorization = 'Bearer ' + getApp().globalData.token
    return chain.request(options)
  }
  const responseInterceptor = (response) => {
    const { statusCode, data } = response
    if (statusCode >= 200 && statusCode < 300) {
      getApp().globalData.userInfo = data.userInfo
    } else {
      const error = new Error(`请求失败，状态码：${statusCode}`)
      error.response = response
      throw error
    }
    return response
  }
  return {
    request: requestInterceptor,
    response: responseInterceptor
  }
}
export { request, put, del, post, checkStatus, interceptor }

import { request, interceptor, checkStatus } from './request'
const chain = interceptor({
  request: (options) => {
    console.log('请求拦截器')
    return options
  },
  response: (response) => {
    console.log('响应拦截器')
    return response
  }
})
request({
  url: 'https://xxx.com/api/users',
  method: 'GET'
})
  .then(checkStatus)
  .then(data => {
    console.log(data)
  })
  .catch(error => {
    console.log(error)
  })