Android version of Chrome browser cannot be implemented through preventDefault to prohibit the entry of specific characters in < input >?

imagine that < input > listens to the keydown event, determines the keyCode of the event parameter object, and then calls preventDefault () to block the input of illegal characters.

sample code: 

   


 the version of the mobile operating system is Android 7.1.1. 


 Why is the output in the Chrome browser inconsistent with Firefox, and why can"t input be blocked through  preventDefault () ?
Chrome javascript dom vue.js
Dec.10,2021

Previous: How do I operate the Angular6 global SCSS variable?

Next: With regard to the use of "template inheritance" in the background, what does the navigation highlight do after the navigation bar of the foreground page is organized into a head file?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea0831-1ae6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea0831-1ae6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?