你好,
请问你是安装在什么系统上的?你安装的时候是用的默认的选项吗(应该会有默认的和自定义两种)?
我在windows 8.1上之前安装过一个VS2015 CTP6, 如下图,是有JavaScript这个编辑器的。所以会不会是你的VS安装的时候遇到某些问题了?

另外,你是不是改变默认的VS安装路径了?
运行下面两个命令行试试:
devenv /setup
devenv.exe /InstallVSTemplates
参考:
http://blog.lishewen.com/post/2015/03/03/vs2015-ctp6-after-installation-without-javascript-intellisense-solution-templates-and-editor(第三方blog,仅供参考)
希望能帮到你!
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