The GlideAjax class allows the execution of server-side code from the client. GlideAjax calls pass parameters to the script includes, and, using naming conventions, allows the use of these parameters.
See GlideAjax - ServiceNow Wiki
var HelloWorld = Class.create();
HelloWorld.prototype = Object.extendsObject(AbstractAjaxProcessor, {
helloWorld: function() {
return gs.example();
}
});
