dwr不允许跨域访问,可在dwrservlet中加入
<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
但有安全隐患,慎用
<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
但有安全隐患,慎用