在微信开放平台上我填写的回调域是:bbs.qiaoshisui.com/LoginApi/WeiXinCallBack,我构造的链接是:https://open.weixin.qq.com/connect/qrconnect?appid=API_ID&redirect_uri=http%3A%2F%2Fbbs.qiaoshisui.com%2FLoginApi%2FWeiXinCallBack&response_type=code&scope=snsapi_login&state=yReXFJhh6y6ytD6p#wechat_redirect
在微信开放平台修改授权回调域(bbs.qiaoshisui.com)就可以了~