how to receve avlue from asp.net button to javascript function

hello

i have abutton in asp.net

and i add an attribute so the click will call to ajavascript function

the add is like thise

Button1.Attributes.Add("OnClick", "ff("+"12,13,78,89"+")");

the javascript function shal devide these string  and read evrey number separated

function ff(str)

{
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