class="selflink">RequestMessageEvent_Subscribe_Msg_Change</span> 类的一个新实例</div></td></tr></table><a href="#PageHeader">Top</a></div><div class="collapsibleAreaRegion"><span class="collapsibleRegionTitle" onclick="SectionExpandCollapse('ID4RB')" onkeypress="SectionExpandCollapse_CheckKey('ID4RB', event)" tabindex="0"><img id="ID4RBToggle" class="collapseToggle" src="../icons/SectionExpanded.png" />属性</span></div><div id="ID4RBSection" class="collapsibleSection"><table class="members" id="pro