概述

请求myPage
myPage附带appid，转向到weChat。（通过appid获取code）
weChat询问用户是否同意授权
用户同意，weChat将附带code并跳转回myPage
myPage附带code到myServer请求用户信息
myServer附带 code,secret到 weChatServer获取token （通过code,secret获取token）
myServer 附带token到weChatServer获取用户信息 （通过token获取用户信息）

example

请求授权码，通过appid

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx42318faaaf0e15a7&redirect_uri=https://wxbackend.asvgo.com/buy.html&response_type=code&scope=snsapi_userinfo&state=myState#wechat_redirect

询问用户是否同意授权

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx42318faaaf0e15a7
&redirect_uri=https://wxbackend.asvgo.com/buy.html
&response_type=code&scope=snsapi_userinfo
&state=myState
&uin=Mjg4NTk4NzA4MA%3D%3D
&key=d5bdbff1071c690447b3b0f64a4180202cb0c59bebee966dd636b21e9eb3ccf17ea2d370dca6037aafbed7010070e485
&pass_ticket=etDdm90QQk5PEUbgWfn0nTC+pllfF2g61l8TZTIo+3VJbGYvXjTQ6UxbGACt32MBzcgt2sii/DSju5H0AFZURg==

3 .转回myapp的页面（附带授权码）

https://wxbackend.asvgo.com/buy.html?ref=NO_REFEREE_ID&td_channelid=myState&code=081xHgpG0epjee2B7zoG06EgpG0xHgpU&state=myState

到myServer获取用户信息 #后台遵循oauth规范： 1.通过code获取token；2.通过token获取用户信息

https://open.api.asvgo.com/wechat-mp-pet-api/mp/pet/web/auth/wxuser-info/071qOk2k0REKIp1nsZ3k0Ooj2k0qOk2w
--->
{"subscribe":null,
"openId":"oxY6BtyMH6QC2eXuBgajdTy22GUo",
"nickname":"afasd",
"sexDesc":"男",
"sex":1,
"language":"zh_CN",
"city":"六盘水",
"province":"贵州",
"country":"中国",
"headImgUrl":"http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTLneMESMlYsVYv7O5sdpup4l3Es5HpElM2UzD7zTbbqGsoY7K7lSzu2FuQos4NQJgjHu90rFFriaCA/132",
"subscribeTime":null,
"unionId":"odJ29wHoxaaa5xAZego7fZsZ2Sdk",
"remark":null,
"groupId":null,
"tagIds":null,
"privileges":[]
}