How to use JS code?

[win]

The following code can be successfully run in QM (requires win10 or powershell5.1，Download the Jint.dll file to the root directory of the C drive), but the result is a lot of characters, and the display is different in powershell ise, how to display only the result 11?

Macro Macro9

Code:

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str s
_s=
;function Invoke-JSAdd ($a, $b) {          
;;;;;Add-Type –Path  "C:\Jint.dll"          
;;;;;;;;;;;;;;
;;;;;$JavaScript = "
;;;;;;;;;function add(a, b) {
;;;;;;;;;;;;;return a + b;
;;;;;;;;;}
;;;;;"          
;;;;;$add = (New-Object Jint.Engine).          
;;;;;;;;;;;;;Execute($JavaScript).          
;;;;;;;;;;;;;GetValue("add")          
;;;;;;;;;;;;;;
;;;;;$add.Invoke($a, $b).ToString()          
;}
;
;Invoke-JSAdd 5 6
PsCmd _s "" s
mes s