为什么yui解析不了后台返回的json数据呢，大牛快来救俺

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为什么yui解析不了后台返回的json数据呢，大牛快来救俺5

我的js代码如下：<script type="text/javascript">

YAHOO.util.Event.addListener(window, "load", function() {
    YAHOO.example.XHR_JSON = function() {

        var myColumnDefs = [
                           {key:"name", sortable:true, resizeable:true},
                           {key:"age", sortable:true, resizeable:true}

                       ];

        var myDataSource = new YAHOO.util.XHRDataSource("http://localhost:9080/YahooTest/json");
        myDataSource.responseType = YAHOO.util.DataSource.TYPE_JSON;
        myDataSource.connXhrMode = "queueRequests";
        myDataSource.responseSchema = {
            resultsList: "items",
            fields: ["name","age"]
        };

        var myDataTable = new YAHOO.widget.DataTable("basic",
                myColumnDefs, myDataSource, {});

        var mySuccessHandler = function() {
            alert('ok');
         };
        var myFailureHandler = function() {
            alert('hh');
                    };
        var callbackObj = {
            success : mySuccessHandler,
            failure : myFailureHandler,
            scope : myDataTable
        };

        myDataSource.sendRequest("",callbackObj);


        return {
            oDS: myDataSource,
            oDT: myDataTable
        };
    }();
});

http://localhost:9080/YahooTest/json返回的json数据是：{ items: [{"name": "dd","age": "ll"},
                                                              { "name": "dd", "age": "ll" },
        { "name": "dd", "age": "ll"} ]
}

   为什么我的页面表格取不到数据呢？还有alert出来的是hh，说明它进入myFailureHandler 了。

YUI