javascript - Adding Var to jQuery.getScript() url string -

i included var url string js files directory in php page:

var jsdir= "<?php echo get_template_directory_uri(); ?>/js";  

now need add each js files within .js file using jquery.getscript , need adding directory var jsdir url string:

$.getscript( "/plugin.js"); 

this pretty trivial string concatenation

$.getscript( jsdir + "/plugin.js");