"if" multiple conditions in javascript : <p>I'm new to javascript and I'd just like a simple explanation of how to use "if" with multiple conditions in javascript.</p>

<p>I've seen stuff like this:
if (condition1 &amp;&amp; condition2)
and
if (condition1) || (condition2)</p>

<p>To my understanding, &amp;&amp; is basically "and", and || is basically "or". Please correct me if I'm wrong.</p>

<p>But would you use these if you wanted to test more than 2 conditions?
And are there any other marks besides &amp;&amp; and || ?
Also, if you were to have a much larger list of conditions. Let's say 10 or 20, then is there a better/proper way to test them other than sticking them all in if() seperated by &amp;&amp; and || ?</p>
