微信小程序前端获取OpenID和session_key

code2Session:

https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code 

wx.login({
    success: (res) => {
        console.log(res.code) //拿到code
        uni.request({
            url:
         	`https://api.weixin.qq.com/sns/jscode2session?
            appid=${appid}&secret=${密钥}&js_code=${res.code}&grant_type=authorization_code `,
            method: 'GET',
            success: (res) => {
                const {openid,session_key} = res.data;//拿到openid和session_key
                // 若要进行登录状态校验，需要在后端调用checkSessionKey接口
            }
        })
    }
})

checkSessionKey：

https://api.weixin.qq.com/wxa/checksession?access_token=ACCESS_TOKEN&signature=SIGNATURE&openid=OPENID&sig_method=SIG_METHOD

参考文档1

参考文档2