formate phone number to format

formattedPhoneNumber.js

formattedPhoneNumber: function formattedPhoneNumber(phone) {
            var formats = '(...) ...-....',
                formattedPhone = '',
                phoneDigits;
            if (!phone) {
                return;
            } else if (phone.substring(0, 1) === '+') {
                phoneDigits = phone.substring(2);
            } else {
                phoneDigits = phone.replace(/[^0-9]/g, '');
            }
            for(prefix in formats) {
                formatChar = formats[prefix];
                if (formatChar === '.') {
                    if (phoneDigits.length === 0) {
                        return;
                    }
                    formattedPhone += phoneDigits.substring(0, 1);
                    phoneDigits = phoneDigits.substring(1);
                } else if (phoneDigits.length > 0) {
                    formattedPhone += formatChar;
                }
            }
            return formattedPhone;
        }