function crossDomainAjax(url, successCallback) {

    // IE8 & 9 only Cross domain JSON GET request

    if ('XDomainRequest' in window && window.XDomainRequest !== null) {

        var xdr = new XDomainRequest(); // Use Microsoft XDR

        xdr.open('get', url);

        xdr.onload = function () {

            var dom = new ActiveXObject('Microsoft.XMLDOM'),

                JSON = $.parseJSON(xdr.responseText);

            dom.async = false;

            if (JSON == null || typeof (JSON) == 'undefined') {

                JSON = $.parseJSON(data.firstChild.textContent);

            }

            successCallback(JSON); // internal function

        };

        xdr.onerror = function () {

            _result = false;

        };

        xdr.send();

    }

        // IE7 and lower can't do cross domain

    else if (navigator.userAgent.indexOf('MSIE') != - &&

             parseInt(navigator.userAgent.match(/MSIE ([\d.]+)/)[], ) < ) {

        return false;

    }

        // Do normal jQuery AJAX for everything else

    else {

        $.ajax({

            url: url,

            cache: false,

            dataType: 'json',

            type: 'GET',

            async: false, // must be set to false

            success: function (data, success) {

                successCallback(data);

            }

        });

    }

}

    crossDomainAjax(url, function (data) {

            if ("" != data) {//data.message

                alert(data);

            } else {

                alert("发送成功!");

                if (isTree == "") {

                    searchTreedata();

                } else {

                    searchdata();

                }

            }

        });