jquery ajax ie9及以下浏览跨域不执行问题

参考链接 http://blog.sina.com.cn/s/blog_502b92330102w7pc.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Bootstrap 实例</title>
    <script src="http://libs.baidu.com/jquery/1.8.3/jquery.min.js"></script>
    <script src="http://libs.cncdn.cn/jquery-ajaxtransport-xdomainrequest/1.0.3/jquery.xdomainrequest.min.js"></script>
</head>
<body>
</body>
<script>
    var ur = 'http://139.129.222.142/happyclass/restfulapi/getClass';
    $.ajax({
        url: ur
        , type: "get"
        , success: function( data, textStatus, jqXHR ){
            alert("返回的数据" + data);
        }
        , error: function(jqXHR, textStatus, errorMsg){
            alert("请求失败:" + errorMsg);
        }
    });
</script>
</html>