$ sudo apt-get update
$ sudo apt-get install libjs-jsxc 

libjs-jsxc is installed in your system.

Make ensure the libjs-jsxc package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjs-jsxc *

You will get with libjs-jsxc package name, version, architecture and description in a table

libjs-jsxc package basic information: