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    <p>You can use selector library, for example Sizzle: <a href="http://sizzlejs.com/" rel="nofollow noreferrer">http://sizzlejs.com/</a> but if you want pure JS that I guess you are stuck with getting all the elements, and then programatically "handpicking" the ones that have classes you are interested in using RegEx like this for example:</p> <p><strong>This is an equivalent of your JQuery oneliner:</strong></p> <pre><code>for( i in document.all) document.all[i].className &amp;&amp; /\bpost-text\b/g.test(document.all[i].className) &amp;&amp; (document.all[i].style.color = "red") </code></pre> <p><em>:)</em></p> <p>If you don't need it in one line you can make it faster (<strong>and much more readable</strong>): </p> <pre><code>var myClassName = "someClass"; var regexp = RegExp("\\b"+myClassName+"\\b/g"); var elements = document.all; for( i in elements){ var this_element = elements[i]; if(regexp.test(this_element.className){ this_element.style.color = "red"; } } </code></pre> <p>If "<strong>for( i in object)</strong>" doesn't work for you, just use classic for loop "<strong>for(var i = 0; i &lt; elements.length; i++)</strong>". </p> <p>It could be '<em>beautified</em>' a bit with the use of some slightly more advanced JS concepts (<em>array function mappings, folding and such</em>), which JS version are you coding agains? I guess it's not ECMA Script 5, right?</p> <p>Also, check out this question/answer <a href="https://stackoverflow.com/questions/210377/get-all-elements-in-an-html-document-with-a-specific-css-class">Get All Elements in an HTML document with a specific CSS Class</a></p>
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