https://developers.weixin.qq.com/doc/oplatform/Website_App/WeChat_Login/Wechat_Login.htmlhttps://developers.weixin.qq.com/doc/oplatform/Website_App/operation.html

调用接口https://open.weixin.qq.com/connect/qrconnect?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect 

https://open.weixin.qq.com/connect/qrconnect?appid=APPID&redirect_uri=url&response_type=code&scope=snsapi_login&state=123#wechat_redirect

appid是应用申请的id，redirect_uri是申请的域名 scope填写的是snsapi_login还是报Scope 参数错误或没有 Scope 权限