新增 event ， 优化 websocket

examples/js_ws_event/sender.js

@@ -0,0 +1,8 @@
+let name=request.getQuery("name")
+let message=request.getQuery("data")
+event.put("messages", JSON.stringify({
+    name:name,
+    data:message
+}));
+
+// response.write(event.subscribe("messages").get())