Preparation code

<div id="foo">
  Bar
</div>
<style>
  .my-style { background-color: red; width: 200px; }
</style>
<script>
  Benchmark.prototype.setup = function() {
    var foo = document.getElementById('foo');
    
    function test1() {
      foo.style.backgroundColor = 'red';
      foo.style.width = '200px';
    }
    
    function test2() {
      foo.style.cssText = 'background-color: red; width: 200px;';
    }
    
    function test3() {
      var list = foo.className.split(' ');
      var pos = list.indexOf('my-style');
      if (pos === -1) foo.className += ' my-style';
    }
    
    function test4() {
      foo.classList.add('my-style');
    }
    
    function bench(func) {
      for (var i = 0; i < 500; i++) func();
    }
  };

  Benchmark.prototype.teardown = function() {
    foo.style.cssText = foo.className = '';
  };
</script>

Preparation code output

Test runner

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bench(test1)

bench(test2)

bench(test3)

bench(test4)

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Cong Liu on 28th February 2013
• Revision 2: published by Cong Liu on 3rd March 2013
• Revision 3: published by Cong Liu on 6th March 2013

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