old_contents: const UA = window.navigator.userAgent;
  
  export const isiOS = /iPhone/i.test(UA);
  
  export const isAndroid = /android/i.test(UA);
  
  export const isMobile = isiOS || isAndroid;
  
new_contents: const UA = window.navigator.userAgent;
  
  export const isiOS = /iPhone/i.test(UA);
  
  export const isAndroid = /android/i.test(UA);
  
  export const isMobile = window.innerWidth < window.innerHeight;
  
subject: Modify the mobile judgment standard