Convert number to persion in javascript

convert_number_to_persion.js

$(document).ready(function(){
    convert_number_to_persion();
});

function convert_number_to_persion() {
    persian = {0: '۰', 1: '۱', 2: '۲', 3: '۳', 4: '۴', 5: '۵', 6: '۶', 7: '۷', 8: '۸', 9: '۹'};
    function traverse(el) {
        if (el.nodeType == 3) {
            var list = el.data.match(/[0-9]/g);
            if (list != null && list.length != 0) {
                for (var i = 0; i < list.length; i++)
                    el.data = el.data.replace(list[i], persian[list[i]]);
            }
        }
        for (var i = 0; i < el.childNodes.length; i++) {
            traverse(el.childNodes[i]);
        }
    }
    traverse(document.body);
}