1、<h:outputText value="Hello " rendered="#{not empty userBean.name}" /> 2、 < h:outputText value = " Name: " onmouseover = " updateName('liyong') " /> < a4j:jsFunction name = " updateName " reRender = " out " > < a4j:actionparam name = " param1 " assignTo = " #{userBean.name} " /> </ a4j:jsFunction >