因为最近公司要写一个项目前台所以开始学习extjs前端框架，希望一起共勉。
那么我们的教程就从 Hello World 讲起。
helloWorld.js
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Ext.onReady( function() {
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Ext.MessageBox.alert( '系统提示', 'Hello World!');
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});
helloWorld.jsp
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<%@ page language="java" contentType="text/html; charset=UTF-8" %>
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<html>
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<head>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<title>hello Word</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<!-- 引入ExtJs样式 -->
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<link rel="stylesheet" type="text/css" href="<%=basePath %>static/ext-6.0.0.415/build/classic/theme-neptune/resources/theme-neptune-all.css">
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<!-- 引入ExtJs核心Js -->
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<script type="text/javascript" src="<%=basePath %>static/ext-6.0.0.415/ext-bootstrap.js"></script>
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<script type="text/javascript" src="<%=basePath %>static/ext-6.0.0.415/build/ext-all.js"></script>
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<script type="text/javascript" src="<%=basePath %>static/ext-6.0.0.415/build/classic/locale/locale-zh_CN.js"></script>
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<!-- 页面Js -->
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<script type="text/javascript" src="<%=basePath %>static/js/helloWord.js"></script>
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</head>
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<body>
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</body>
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</html>
说明：
(1)Ext.onReady():ExtJS Application的入口...就相当于Java或C#的main函数.
(2)Ext.MessageBox.alert()：弹出对话框。