I do not see where javascript settings can be changed in the font and color settings.
Open the IDE options dialog: Tools | Options | Wednesday | Fonts and colors
In the "Display Items" list, find items that start with "Script"
VS2012 - Javascript Display Elements:
Identifier = "All JS Identifiers"
Keyword = "All JS keywords, for example: var, if, else, this"
String = "all string elements"
Comment = "all comments in JS"
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Visual Studio 2015, .cshtml, javascript , Bracematching(Rectangle) Display Items.
.cshtml
javascript
Bracematching(Rectangle)
Display Items