jquery file upload插件动态修改url

$('#fileupload').fileupload({
url: xxxxx,
autoUpload:true,
add: function (e, data) {
if($("#import-orgId").val() == null){
tips("提示","请选择门店");
}else{
var url = xxxx;//新的url;
$(this).fileupload('option', 'url', url);
data.submit();
}
    },
    done: function (e, data) {
    var result = data.result;
       }
});