下载地址
http://www.sencha.com/products/extjs/download
To get started, unzip the archive to your local web server and navigate to
http://localhost/your-ext-install/ to view the documentation and
complete working examples. Any samples that use Ajax will need to be on an
web server in order to work correctly.
引用
<script type="text/javascript" charset="utf-8" src="http://cdn.sencha.io/ext-4.2.0-gpl/ext-all.js"></script>
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