引入wechat js sdk

app/controllers/wechats_controller.rb

@@ -383,7 +383,15 @@ class WechatsController < ActionController::Base
       render 'wechats/user_activities', layout: nil
     end
 
+   
+
     def user_activities
+
+      @appid = Wechat.config.appid
+      ## sign
+
+      @sign_params = wechat.jsapi_ticket.signature(current_url)
+
       session[:wechat_code] = params[:code] if params[:code]
       @path = '/'+(params[:state] || '')
       open_id = get_openid_from_code(params[:code]) rescue
@@ -431,6 +439,9 @@ class WechatsController < ActionController::Base
       uw = UserWechat.where(openid: openid).first
     end
 
+    def current_url
+      "#{request.protocol}#{request.host_with_port}#{request.fullpath}"
+    end
 
 
   end

app/views/wechats/user_activities.html.erb

@@ -12,6 +12,7 @@
   <link type="text/css" rel="stylesheet" href="/stylesheets/weui/weui.min.css" />
   <%= stylesheet_link_tag '/stylesheets/weui/weixin.css' %>
 
+  <script src="//res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
   <script type="text/javascript">
     window.g_debug = false; //调试标志,如果在本地请置为true
     window.apiUrl = '/api/v1/';
@@ -21,6 +22,24 @@
     <% elsif @project_id %>
     window.g_projectid = <%= @project_id %>;
     <% end %>
+
+    wx.config({
+      debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
+      appId: '<%= @appid %>', // 必填，公众号的唯一标识
+      timestamp: <%= @sign_params[:timestamp] %>, // 必填，生成签名的时间戳
+      nonceStr: '<%= @sign_params[:noncestr] %>', // 必填，生成签名的随机串
+      signature: '<%= @sign_params[:signature] %>',// 必填，签名，见附录1
+      jsApiList: ['onMenuShareTimeline', 'onMenuShareAppMessage', 'onMenuShareQQ', 'onMenuShareWeibo', 'onMenuShareQZone',
+        'hideMenuItems','closeWindow', 'scanQRCode'] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2
+    });
+
+    wx.ready(function(){
+      console.log("wx ready");
+    });
+
+    wx.error(function(err){
+      console.log(err);
+    });
   </script>
 
 </head>