How do I receive the browser javascript console.log result as an a360 variable value?

topic,
I want receive the browser javascript console.log result as an a 360 variable value..

can i get some guide? or a360 browser document? 

my code is here
i = 0;
while (i < 7) {
    element = 'listitem' + i + 'innerListBoxdropdownlisteditorgrd2';
    textContent = document.getElementById(element).textContent;
    console.log(textContent);
    i++;
}

I would appreciate really. it if solution