Is there a "getElementsByClass" function in JavaScript?
If not, how does jQuery manage to do it without looping through all elements which would be very inefficient?
Also, how can I specify CSS for elements with two or more classes?
<a class="one two">test</a>
Do I need to write the CSS like this?
.one.two {...}
Or is there another way to target elements with multiple classes?
If you need to find elements by their class name, the getElementsByClassName function is available. jQuery utilizes this function internally whenever possible. Take a look at the selector.js file in the jQuery source code
When selecting elements with multiple classes, you can use the .class.class selector:
$('.one.two')
jQuery relies on the powerful Sizzle selector engine.
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