给Ajax 优化代码

给自己的代码优化一下

function Dream_Ajax(url, parms, fuSuccess, fuError, isAsync, isPost, retrueType) {
    /// <summary>Ajax自定义请求</summary>
    /// <param name="url" type="string">请求url</param>
    /// <param name="parms" type="JSON">参数</param>
    /// <param name="fuSuccess" type="Function">请求成功</param>
    /// <param name="fuError" type="Function">请求失败（选填）</param>
    /// <param name="isAsync" type="Bool">是否异步，默认异步（选填）</param>
    /// <param name="isPost" type="Bool">是否POST，默认POST（选填）</param>
    /// <param name="retrueType" type="string">返回数据类型，默认JOSN（选填）</param>
    if (!arguments[0]) { return }
    var obj = new Object();
    obj["isAsync"] = arguments[4] == undefined ? true : arguments[4];//不填写，默认为true异步请求
    obj["isPost"] = arguments[5] == undefined ? "POST" : (arguments[5] == true) ? "POST" : "GET";//不填写，默认为Post请求
    obj["retrueType"] = arguments[6] == undefined ? "json" : arguments[6];//不填写，默认为json异步请求
    var newparms = new Object();
    jQuery.extend(newparms, parms);//合并newparms, parms
    $.ajax({
        type: obj["isPost"],
        async: obj["isAsync"],
        url: url,
        data: newparms,
        dataType: obj["retrueType"],
        success: fuSuccess,
        error: fuError
    });
}

Dream_Ajax('/Menu/Delete', { ClassID:1}, function (data)
{

});