“Ext is not defined” issue in ExtJS 4

Question

I came across a "Ext is not defined" issue in ExtJS 4. I am actually testing the example here to starting learning ExtJS 4.

I have my example script file included:

<script type="text/javascript" src="orderRead.js"></script>
<script type="text/javascript" src="order.js"></script>

as well as these ExtJS script files:

<script type="text/javascript" src="extjs/ext-all.js"></script>
<script type="text/javascript" src="extjs/ext-all-debug.js"></script>

but the problem is still there. Attached is the error message from Firebug:

Answer 1

将Ext库的脚本标签放在示例文件的脚本标签之前，以便在代码运行时加载它们。

Answer 2

You should include the ext-base.js and ext-all.js files in following order.

<script type="text/javascript" src="extjs/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="extjs/ext-all.js"></script>