fix(Popup): removed useless content from the popup demo

Author: anlyyao

src/popup/_example/popup.ts

@@ -1,30 +1 @@
-Page({
-  placement: '',
-
-  data: {
-    bottom: false,
-    center: false,
-    left: false,
-    right: false,
-  },
-
-  handlePopup(e) {
-    const placement = e.currentTarget.dataset.type;
-
-    this.placement = placement;
-
-    this.setData({
-      [placement]: true,
-    });
-  },
-
-  onVisibleChange({ detail }) {
-    const { visible } = detail;
-
-    if (this.placement) {
-      this.setData({
-        [this.placement]: visible,
-      });
-    }
-  },
-});
+Page({});