如下图:js保存了,不能为null,可不是null啊。function ajaxuser()
{
  $.ajax({
type: "get",
url: "/Room/Memo/MemoAdminAdd.aspx?Action=GetUserInfo",
beforeSend: function(XMLHttpRequest){
//ShowLoading();
},
success: function(data, textStatus){
        var jsonString = data;
        var arrMemberList=jsonString.split("|");  
        var memberInfoDiv="";
        var memberInfo="";
        var topuserinfo='<div class="look_allbox"><h1><span class="left">查看所有用户 (共注册'+arrMemberList.length+'人)</span><a onclick="javascript:closeDiv();" style="cursor:pointer;"><img src="images/xx.gif" alt="关闭" /></a></h1><div class="look_innerbox"><ul>';
        //var footuserinfo='</ul></div><div class="look_button"><input name="" type="button" value="确定" onclick="javascript:closeDiv();" class="login_button" style="cursor:pointer;" /> <input name="" type="button" value="取消" onclick="javascript:closeDiv();"  class="login_button" style="cursor:pointer;" /></div></div>';
        var footuserinfo='</ul></div></div>';
        for(var i=0;i<arrMemberList.length;i++){
          memberInfo=arrMemberList[i].split(",");
          memberInfoDiv+='<li><input id="'+memberInfo[0]+'" name="radio" type="radio" value='+memberInfo[1]+' onclick="putvalue(this.value);" />'+memberInfo[1]+'</li>';
          }
        alert(topuserinfo);
        alert(memberInfoDiv);
        alert(footuserinfo);
        $get("popDiv").innerHTML=topuserinfo+memberInfoDiv+footuserinfo;        showDiv();
},
complete: function(XMLHttpRequest, textStatus){
//HideLoading();
},
error: function(){
//请求出错处理
alert("数据获取失败");
}
});
}