two ways to change height or width in JQuery
<pre><code>$(selector).height(value)
$(selector).width(value)
</code></pre>

<p>We can use the above two ways to change the <code>height</code> or <code>width</code> of a <code>div</code> or element. but there is also another way, like</p>

<pre><code>$(selector).css({"height": "100px", "width":"100px"})
</code></pre>

<p>since the second way can be applied to all css element, why the first method? </p>
