点击允许后，跳转到微信的'https://open.weixin.qq.com/connect/oauth2/authorize?appid='+appid

+'&redirect_uri='+encodeURIComponent(url)

+'&response_type=code&scope=snsapi_userinfo&forcePopup=true&state=1#wechat_redirect'

然后没反应了，不重定向回来