check exist for jq

JavaScript performance comparison

Test case created by Johnson Jiang

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
Benchmark.prototype.setup = function() {
    var $wrapper = $("#wrapper");
};
</script>

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Testing in unknown unknown
Test Ops/sec
not check
$wrapper.addClass("hover");
pending…
check exist
if ($wrapper[0]) {
  $wrapper.addClass("hover");
}
pending…
check length
if ($wrapper.length > 0) {
  $wrapper.addClass("hover");
}
pending…

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