Wechat applet 8 cloud function

Wechat applet 1- The basics of applets , Installation and use of development tools
Wechat applet 2-WXSS,WXS
Wechat applet 3- Applet lifecycle and components
Wechat applet 4- Applet api
Wechat applet 5- Real machine test
Wechat applet 6- Development of cloud - Cloud database
Wechat applet 7- Cloud storage

1. Cloud functions

Cloud function is a piece of code running in the cloud , No need to manage servers , Write... In development tools 、 One click upload deployment to run back-end code .

    1). Create cloud functions

Small program provides a dedicated function for the cloud call API, Developers can use it in cloud functions wx-server-sdk Provided getWXContext Method gets the context of each call （appid、openid etc. ）, No need to maintain complex authentication mechanism , You can get the natural and trusted user login status （openid）.

        (1). Find... In the current folder ”cloudfunctions“ file -> Right click Select current environment

        (2). newly build Node.js Cloud functions

//  Cloud function entry file 
const cloud = require('wx-server-sdk')

cloud.init()

//  Cloud function entry function 
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()

  return {
    event,
    openid: wxContext.OPENID,
    appid: wxContext.APPID,
    unionid: wxContext.UNIONID,
  }
}

        (3). Deploy cloud functions

    2). Use cloud functions

wx.cloud.callFunction({
      name: 'getUserInfo',
      data: {
      },
      success: (res) => {
        console.log(res)
      }
    })