传递参数到回调函数

昨天项目需要将参数传递到回调函数，具体实现如下：

<script language="ecmascript" type="text/ecmascript">
        var fieldCollection;
        var field;
        var list;

        function getFieldType() {
            var clientContext = SP.ClientContext.get_current();
            if (clientContext != undefined && clientContext != null) {
                var webSite = clientContext.get_web();
                this.list = webSite.get_lists().getByTitle("PeopleList");
                this.fieldCollection = list.get_fields();
                this.field = fieldCollection.getByTitle("Title");
                clientContext.load(this.field);
                var myCallBack = Function.createCallback(OnLoadSuccess, this.field);
                clientContext.executeQueryAsync(Function.createDelegate(this, myCallBack),
                                                Function.createDelegate(this, this.OnLoadFailed));
                alert('In main function... ' + field.get_title());
            }
        }

        function OnLoadSuccess(sender, args, field1) {
            alert('In callback success... ' + field1.get_title());
        }

        function OnLoadFailed(sender, args) {
            alert('Request failed. ' + args.get_message() + '\n' +
            args.get_stackTrace());
        }        
    </script>