uniapp packaging white screen problem

• [bug]: The browser is running normally, but only the tab bar is displayed when the emulator or real machine is running, or the screen is completely blank. Packing is also a white screen.

• [Console error message]:
  
  Note: app does not support dom operations

• [Solution]: Modify the render function in main.js
  
  to be the function createElement that vue renders the dom structure through js. The app does not support dom operations, so just set it here.