<!-- main wrapping component -->
<q-layout>
  <q-window-resize-observable @resize="fnOnScreenResize"></q-window-resize-observable>
  <!-- optional -->
  <q-page-container>
  <!-- 要加上 div q-resize-observable menu 縮放時, 才有效 //-->
  <div :style="VarPageContainerCss">
  <q-resize-observable @resize="fnOnContainerResize"></q-resize-observable>