微信小程序 授权登录代码

我可以提供微信小程序授权登录的代码示例，具体如下：

1、在小程序设置里开启微信登录功能

2、引用登录组件

var app=getApp();
var {openid}=app.globalData;
var {user_info}=app.globalData;

App({
  onLaunch: function () {
    var that=this;
    var systemInfo=wx.getSystemInfoSync();
    //获取设备宽高然后进行数据绑定
    that.globalData.winWidth=systemInfo.windowWidth;
    that.globalData.winHeight=systemInfo.windowHeight;
    that.checkLogin();
  },
  checkLogin:function(){
    var that=this;
    return new Promise(function(resolve,reject){
      if(!openid){
        wx.login({
          success:function(res){
            if(res.code){
              wx.getUserInfo({
                success:function(res){
                  wx.request({
                    url:'API接口地址',
                    data:{
                      action:'login',
                      code:res.code,
                      nickName:res.userInfo.nickName,
                      avatarUrl:res.userInfo.avatarUrl,
                      gender:res.userInfo.gender,
                      province:res.userInfo.province,
                      city:res.userInfo.city,
                      country:res.userInfo.country
                    },
                    method:'POST',
                    header:{
                      'content-type':'application/x-www-form-urlencoded'
                    },
                    success:function(res){
                      if(res.data.status === 1){
                        openid=res.data.openid;
                        user_info= res.data.userInfo;
                        that.globalData.user_info=user_info;
                        that.globalData.openid=openid;
                        resolve();
                      }
                      else{
                        that.globalData.openid='';
                        that.globalData.user_info={};
                        reject(res.data.msg);
                      }
                    },
                    fail:function(res){
                      reject(res);
                    }
                  })
                },
                fail:function(res){
                  reject(res);
                }
              })
            }
            else{
              reject(res);
            }
          },
          fail:function(res){
            reject(res);
          }
        })
      }
      else{
        resolve();
      }
    })
  },

  globalData: {
    openid:'',
    user_info:{},
    winWidth:'',
    winHeight:'',
  }
})

3、调用登录方法并获取用户信息

// pages/home/home.js
var app=getApp();
var {openid}=app.globalData;
var {user_info}=app.globalData;

Page({
  data:{
    openid:'',
    nickname:'',
    avatar:'',
  },
  onLoad:function(options){
    var that=this;
    if(user_info) {
      that.setData({
        openid:openid,
        nickname:user_info.nickName,
        avatar:user_info.avatarUrl
      })
    }
    else {
      app.checkLogin().then(function(){
        that.setData({
          openid:openid,
          nickname:user_info.nickName,
          avatar:user_info.avatarUrl
        })
      })
    }
  }
})

希望能够帮到你！