关于DWR异步查询问题用户昵称验证

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关于DWR异步查询问题用户昵称验证5

功能介绍：

用户注册时，输入用户名后，自动检测用户是否可用。

问题描述：输完用户没有任何提示信息（<div id="resultMessage"></div>），

web.xml配置信息：
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<description></description>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>allowScriptTagRemoting</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

dwr.xml:
<allow>
<create creator="new" javascript="checkname">
<param name="class"
value="com.dwr.common.util.CheckNickName" />
</create>
</allow>

当页面第一次加载的时候，控制台打印：
2009-04-11 19:28:14,250 [org.directwebremoting.impl.StartupUtil]-[INFO] DWR Version 2.0.5 starting.
2009-04-11 19:28:14,250 [org.directwebremoting.impl.StartupUtil]-[INFO] - Servlet Engine: Apache Tomcat/6.0.16
2009-04-11 19:28:14,250 [org.directwebremoting.impl.StartupUtil]-[INFO] - Java Version:   1.5.0_06
2009-04-11 19:28:14,250 [org.directwebremoting.impl.StartupUtil]-[INFO] - Java Vendor:    Sun Microsystems Inc.
2009-04-11 19:28:15,000 [org.directwebremoting.dwrp.DefaultConverterManager]-[INFO] Probably not an issue: org.jdom.Document is not available so the jdom converter will not load. This is only an problem if you wanted to use it.
2009-04-11 19:28:15,000 [org.directwebremoting.dwrp.DefaultConverterManager]-[INFO] Probably not an issue: org.jdom.Element is not available so the jdom converter will not load. This is only an problem if you wanted to use it.

JSP页面： <script type='text/javascript' src='<c:url value='/Js/calendar.js'/>'></script>
    <script type='text/javascript' src='<c:url value='/Js/dwr/engine.js'/>'></script>
<script type='text/javascript' src='<c:url value='/Js/dwr/util.js'/>'></script>
<script type='text/javascript' src="<c:url     value='/dwr/interface/checkname.js'/>"></script>
<script type="text/javascript">
function checkname(){
var text = DWRUtil.getValue("userName");
alert(text);
checkname.checkNickName(text, callbackCheck);
alert(text);
}
function callbackCheck(data){
DWRUtil.setValue("resultMessage",data);
alert(data);
}
</script>

执行到第一个alert(text)能接收到参数，后就不在执行，控制台也没打印信息。
checkname.checkNickName()该方法主业务方法，测试没有问题。

DWR