Jquery自动完成

$("input#txtaddkey").autocomplete({
            source: "keyword.PHP",minLength: 2
        });

PHP代码

$fetch = MysqL_query("SELECT * FROM o_keyword where keyword like '%" . $query . "%'"); 

    while ($row = MysqL_fetch_array($fetch,MysqL_ASSOC)) {
        $row_array['id'] = $row['id'];
        $row_array['keyword'] = $row['keyword'];

        array_push($return_arr,$row_array);
    }
echo json_encode($return_arr);

JSON数据输出

[{"id":"2","keyword":"Games"},{"id":"3","keyword":"Goa"}]

在键入“Ga”时,我在前端获得空li标签.