document.getElementById("<%=hfSelectedAreaCode.ClientID%>").value = $(window.frames["AreaDropDownListFrame"].document).find("#控件ID").val();
document.getElementById("<%=hfSelectedAreaCode.ClientID%>").value = $(window.frames["AreaDropDownListFrame"].document).find("#控件ID").val();
转载于:https://www.cnblogs.com/shengxiang/archive/2011/06/15/2081151.html