Mascara de telefone ou celular Brasil

BrPhoneMask.js

// Use a classe ".phoneNumber" no campo input do telefone
$('.phoneNumber').on('keyup', function (e) {
        if(e.keyCode == 8){
            let numberField = $(this);
            let num = numberField.val();

            if(num.length == 15){
                let n = num.replace(/ /g, '');
                n = n.split('');

                let test = '';

                $.each(n, function (i, val) {
                    if(i === 4 || i === 8){
                        val = ' ' + val;
                    }
                    test = test + val;
                });
                numberField.val(test);
            }
        }
    }).on('keypress', function (e) {
        var charCode = (e.which) ? e.which : e.keyCode;
        if (charCode != 46 && charCode > 31
            && (charCode < 48 || charCode > 57))
            return false;

        let numberField = $(this);

        let num = numberField.val();

        if(num.length == 16)
            return false;

        if(num.length == 1 && e.keyCode != 8){
            numberField.val('('+num);
        }

        if(num.length == 3 && e.keyCode != 8){
            numberField.val(num+') ');
        }

        if(num.length == 9 && e.keyCode != 8){
            numberField.val(num+' ');
        }

        if(num.length == 14 && e.keyCode != 8){
            let n = num.replace(/ /g, '');
            n = n.split('');

            let test = '';

            $.each(n, function (i, val) {
                if(i === 4 || i === 5 || i === 9){
                    val = ' ' + val;
                }
                test = test + val;
            });

            numberField.val(test);
        }
    });

BrPhoneMask.md

Mascara para telefone ou celulares - Formato Brasil

**Exemplo: ** https://jsfiddle.net/marcelobdsilva/hjmqvops/5/