问题：当采用中文输入法打拼音过程中或输入空格时两个错误
1.Resource interpreted as Script but transferred with MIME type baiduapp/json: "http://suggestion.baidu.com/su?wd=&_=1407990774861". 这个是jQuery的警告
2.Uncaught TypeError: Cannot read property 'sug' of undefined

<

script>
//回调函数
        function resultcallback(res){
            var txt = res.s;
            var html = '';

            for(var i in txt){
                  html+='
'+txt[i]+'
';
            }

            $('#search-result').html(html);
            $('#suggest-search').show().css({position: 'absolute',
                top: $('#search-form').offset().top+$('#search-form').height()+10,
                left: $('#search-form').offset().left-1
            });
        }
//绑定键盘事件
        $('#search-input').bind('keyup',function(){
            var searchText = $('#search-input').val();

                var url = "http://suggestion.baidu.com/su?wd="+searchText+"&json=1&p=3&cb=resultcallback";
                var $html = "