'You must include DWR engine before including this file'
js代码：
if (typeof dwr == 'undefined' || dwr.engine == undefined) throw new Error('You must include DWR engine before including this file');
原因是：
<scripttype="text/javascript"src="<%=path%>/dwr/interface/test.js"></script>
<scripttype="text/javascript"src="<%=path%>/dwr/engine.js"></script>
<scripttype="text/javascript"src="<%=path%>/dwr/util.js"></script>
这个顺序在DWR3.0已经不是这样了，2.0前就可以正常使用。
所以，
<scripttype="text/javascript"src="<%=path%>/dwr/engine.js"></script>
<scripttype="text/javascript"src="<%=path%>/dwr/util.js"></script>
<scripttype="text/javascript"src="<%=path%>/dwr/interface/test.js"></script>
这样的顺序才能正常使用。