封装ajax

  var sendData = function(options) {
        var mat = options.url.match(/https?://([^/]+)/);
        if (mat && location.host != mat[0]) {
            jsonp(options);
        } else {
            ajax(options);
        }
    }

    var jsonp = function(options) {
        options = options || {};
        if (!options.url) {
            throw new Error("Parameter is not valid");
        }
        var callbackName = ('jsonp_' + Math.random()).replace(".", "");
        var oHead = document.getElementsByTagName('head')[0];       
        var oS = document.createElement('script');
        oHead.appendChild(oS);
        window[callbackName] = function(json) {
            oHead.removeChild(oS);
            clearTimeout(oS.timer);
            window[callbackName] = null;
            options.success && options.success(json);
        };
        if (options.url.indexOf('?') == -1) {
            oS.src = options.url + '?callback=' + callbackName;
        } else {
            oS.src = options.url + '&callback=' + callbackName;
        }
        if (options.time) {
            oS.timer = setTimeout(function() {
                window[callbackName] = null;
                oHead.removeChild(oS);
                options.fail && options.fail({
                    message: "timeOut"
                });
            }, time);
        }
    }
    var ajax = function(options) {
        options = options || {};
        options.type = (options.type || "GET").toUpperCase();
        options.dataType = options.dataType || "json";
        var params = formatParams(options.data);
        if (window.XMLHttpRequest) {
            var xhr = new XMLHttpRequest();
        } else {
            var xhr = new ActiveXObject('Microsoft.XMLHTTP');
        }
        xhr.onreadystatechange = function() {
            if (xhr.readyState == 4) {
                var status = xhr.status;
                if (status >= 200 && status < 300) {
                    options.success && options.success(xhr.responseText, xhr.responseXML);
                } else {
                    options.fail && options.fail(status);
                }
            }
        }
        if (options.type == "GET") {
            xhr.open("GET", options.url + "?" + params, true);
            xhr.send(null);
        } else if (options.type == "POST") {
            xhr.open("POST", options.url, true);
            xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            xhr.send(params);
        }
    }