add yoho page

+import app from './yoho-app';
+import $ from 'yoho-jquery';
+import qs from 'yoho-qs';
+
+class Page {
+    constructor() {
+        this.app = app;
+        this.qs = qs;
+        this.$event = $(document);
+    }
+    on(name, ...cb) {
+        name = `yohoevent.${name}`;
+        this.event.on(name, ...cb);
+    }
+    emit(name, ...data) {
+        this.$event.trigger(name, ...data);
+    }
+    ajax(options = {}) {
+        return Promise.resolve($.ajax(options));
+    }
+}
+
+export default Page;