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\n\n<p>Even though a local web server is not a requirement to use Ext JS 4, it is still highly recommended that you develop with one, since <a href=\"http://en.wikipedia.org/wiki/XHR\">XHR</a> over local <a href=\"http://en.wikipedia.org/wiki/File_URI_scheme\">file:// protocol</a> has <a href=\"http://en.wikipedia.org/wiki/Same_origin_policy\">cross origin restriction</a> on most browsers.\nIf you don't already have a local web server it is recommended that you download and install Apache HTTP Server.</p>\n\n<p>实际上尽管不是每一个WEB服务器都必须使用Ext JS 4，它仍然在其他的开发中得到较高的推荐</p>\n\n<ul>\n<li><a href=\"http://httpd.apache.org/docs/current/platform/windows.html\">Instructions for installing Apache on Windows</a></li>\n<li><a href=\"http://httpd.apache.org/docs/current/install.html\">Instructions for installing Apache on Linux</a></li>\n<li>Mac OS X comes with a build in apache installation which you can enable by navigating to \"System Preferences > Sharing\" and checking the box next to \"Web Sharing\".</li>\n</ul>\n\n\n<p>Once you have installed or enabled Apache you can verify that it is running by navigating to <a href=\"http://localhost/\">localhost</a> in your browser.  You should see a startup page indicating that Apache HTTP Server was installed successfully and is running.</p>\n\n<h3>1.3. Ext JS 4 SDK</h3>\n\n<p>Download <a href=\"http://www.sencha.com/products/extjs/\">Ext JS 4 SDK</a>. Unzip the package to a new directory called \"extjs\" within your web root directory.  If you aren't sure where your web root directory is, consult the docs for your web server.\nYour web root directory may vary depending on your operating system, but if you are using Apache it is typically located at:</p>\n\n<p>下载的Ext JS 4 SDK中。包解压缩到一个新的目录称为ExtJS的在你的web根如果您不能确定您的网站根目录，请咨询您的Web服务器的文档。你的网站根目录可能会有所不同，取决于您的操作系统，但如果你使用的是Apache，它通常位于：