JS-Accordion, cannot (display="block") all other Panel-Elements

Hello,

I have the following code from w3schools, opening an closing an accordion-list (panel).
(CSS works well!!) I wanted to augment the version: When I open a panel all the other panels should close. I tried to use the second loop in /**/, however this does not work.
Any suggestions? Thanks a lot!

   

 (function () {
      
        var acc = document.getElementsByClassName("accordion");
        var i,j;

        for (i = 0; i < acc.length; i++) {...

Code (JavaScript):

JS-Accordion, cannot (display="block") all other Panel-Elements

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