webstorm [Version 2020.3 and Version 2020.2] A fatal problem [JavaScript inherits the method of the parent class-unable to execute smart prompts-some libraries do not]
But the version of webstorm [Version 2020.1.4] is normal
At the moment [2020.12.20] The latest version is [Version 2020.3] It is recommended not to use the latest version as much as possible [The latest version has many bugs unknown-please use the previous stable version-and do not update automatically]