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finish work part 1
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<section>
<h1 id="setting-default-options">Setting default options</h1>
<p>
In some cases, you need to set the default options for all instances of
Select2 in your web application. This is especially useful when you are
migrating from past versions of Select2, or you are using non-standard
options <a href="#amd">like custom AMD builds</a>. Select2 exposes the
default options through <code>$.fn.select2.defaults</code>, which allows
you to set them globally.
</p>
<p>
When setting options globally, any past defaults that have been set will
be overriden. Default options are only used when an option is requested
that has not been set during initialization.
</p>
<p>
<strong>You can set default options</strong> by calling
<code>$.fn.select2.defaults.set("key", "value")</code>. The key that is
set should take the same format as keys set using
<a href="#data-attributes">HTML <code>data-*</code> attributes</a> which
means that two dashes (<code>--</code>) will be replaced by a level of
nesting, and a single dash (<code>-</code>) will convert it to a camelCase
string.
</p>
<pre class="prettyprint">
$.fn.select2.defaults.set("theme", "classic");
</pre>
<p>
<strong>You can reset the default options</strong> by calling
<code>$.fn.select2.defaults.reset()</code>.
</p>
</section>
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