JS向回调函数中传入参数的办法

//JS回调函数传参办法：利用Closure
var callback = {
        success:function(data){
            var item = document.createElement("li");
            item.id = data.id;
            item.innerHTML = "The id is : " + data.id;
            item.innerHTML += " The value is : " + data.value;
                 
            var parent = document.getElementById("result");
            parent.appendChild(item);
        },
        failure:function(){
            alert('failure:');
        }
    }
     
    xhr = new QueuedHandler();
    for(var i=0;i<20;i++){
        xhr.request('get','ajaxproxy.php?id='+i,function(data){       
            data = eval('(' + data + ')');
            data.id = i;
            callback.success(data);
        });
     
    }