文档是这么说的。没有的话，可以贴一下图吗（我用的 idea 最新版是有的，没有 webstorm ）
https://www.jetbrains.com/help/webstorm/saving-and-reverting-changes.html#mark-unsaved-filesMark files with unsaved changes
You can mark unsaved files with an asterisk (*) on the file tab:
In the Settings dialog (Ctrl+Alt+S), select Editor | General | Editor Tabs.
Select the Mark modified (*) checkbox.
Click Apply to save the changes and close the dialog.
After that, the tab of the file in which you have unsaved changes will be marked with an asterisk.
If you use version control integration, names of all modified files will be also marked with a dedicated color on the file tab and in the Project tool window.