Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var nop = function () {},
        get1 = function (q) {return document.querySelector(q);},
        get2 = (function () {
            var doc = document;
            return function (q) {
                return doc.querySelector(q);
            };
        })(),
        get3 = document.querySelector.bind(document);
  };
</script>

Test runner

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nop(get1('body'));

nop(get2('body'));

nop(get3('body'));

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