Hello，I am using vuepress-plugin-mathjax in vuepress. Now some problems troubles me. Content in markdown is ``` $$f(i>>1)=\begin{cases}f(i)& \text{i的最后一位是0}\\f(i)-1& \text{i的最后一位是1}\end{cases}$$ ``` After building and devloping the vuepress，It doesn't work.  But it is works in https://www.mathjax.org/#demo。 
Hello，I am using vuepress-plugin-mathjax in vuepress. Now some problems troubles me.
Content in markdown is
After building and devloping the vuepress，It doesn't work.
But it is works in https://www.mathjax.org/#demo。
