看变量jsp中包了几层从debug看

var dqgj;
function initDatagrid(url,param,oid){
alert(1);
$.ajaxsend({
url:url,
data:param,
success:function(data){
dqgj =data;
$(oid).datagrid({
data: data["data"],
onLoadSuccess:function(){
$('.linkbutton').linkbutton({iconCls: 'l-icon-view'}); 
}
});
}
});
alert(dqgj.data.length);
if(dqgj==null||dqgj==""||dqgj.data.length==0){
//myChart.hideLoading();//取消loading

var gj= document.getElementById("dqgjdiv");
var html =" <div>";
html +="没有可以显示数据！";
html +=" </div>";

gj.innerHTML =html;
document.getElementById("dqgjdiv").setAttribute("align","center");
document.getElementById("dqgjdiv").setAttribute("height","10px");
return;

}
}