query selector data different thatn code example

Example 1: how to select data attribute in javascript using queryselectorAll

<!DOCTYPE html>
    <html>
        <head></head>
        <body>
            <p data-foo="0"></p>
            <h6 data-foo="1"></h6>
            <script>
                var a = document.querySelectorAll('[data-foo]');

                for (var i in a) if (a.hasOwnProperty(i)) {
                    alert(a[i].getAttribute('data-foo'));
                }
            </script>
        </body>
    </html>

Example 2: js queryselector find without attribute

var test = document.querySelectorAll('input[value][type="checkbox"]:not([value=""])');

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