The syntax that Sublime selects is based primarily on the extension that the file has.
You can select View > Syntax > Open all with current extension as...
from the menu while you have such a file open to tell Sublime what syntax you want it to use for any particular extension.
If you sometimes use regular JavaScript as well, you'll experience your current problem in reverse; you will have to manually swap the syntax back to JavaScript.
Either way, the Project Specific Syntax Settings package may also be useful in this case if you use projects. It will allow you to configure per project what you want the syntax for different files to be.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…