~/.ctags に設定を書けば解決した。
--langdef=js
--langmap=js:.js
--regex-JavaScript=/([A-Za-z0-9._$\(\)]+)[ \t]*[:=][ \t]*function[ \t]*\(/\1/m,method/
--regex-JavaScript=/([A-Za-z0-9._$\#\(\)]+)[ \t]*[:][ \t]*([A-Za-z0-9._\-\#\'\"]+)[ \t]*/\1/p,property/
--regex-JavaScript=/([A-Za-z0-9._$\#\(\)]+)[ \t]*[:][ \t]*([A-Za-z0-9\'\"._\-\#\(]+)[ \t]*\{/\1/p,property/
--regex-JavaScript=/var ([A-Za-z0-9._$\#]+)[ \t]*[=][ \t]*([A-Za-z0-9._'"\$\#\[\{]+)[,|;]/\1/v,variable/
--regex-JavaScript=/([A-Za-z0-9._$\#]+)[ \t]*[=][ \t]*([A-Za-z0-9._'"\$\#]+)extend\(/\1/c,class/
--regex-js=/([A-Za-z0-9._$]+)[ \t]*[:=][ \t]*\{/\1/,object/
--regex-js=/([A-Za-z0-9._$()]+)[ \t]*[:=][ \t]*function[ \t]*\(/\1/,function/
--regex-js=/function[ \t]+([A-Za-z0-9._$]+)[ \t]*\(([^)])\)/\1/,function/
--regex-js=/([A-Za-z0-9._$]+)[ \t]*[:=][ \t]*\[/\1/,array/
--regex-js=/([^= ]+)[ \t]*=[ \t]*[^"]'[^']*/\1/,string/
--regex-js=/([^= ]+)[ \t]*=[ \t]*[^']"[^"]*/\1/,string/