原生Ajax封装随笔

XMLHttpRequest 对象用于和服务器交换数据。我们使用 XMLHttpRequest 对象的 open() 和 send() 方法：

open(method,url,async)

method：请求的类型；GET 或 POST

url：文件在服务器上的位置

async：true（异步）或 false（同步）

send(string)

string：仅用于 POST 请求

注：如果需要像 HTML 表单那样 POST 数据，需设置 setRequestHeader() 来添加 HTTP 头，然后在 send() 方法中规定您希望发送的数据：XMLHttpRequest.setRequestHeader("Content-type","application/x-www-form-urlencoded");示例如下代码58行所示。

 var Factory = {
     create: function() {
         return function() { this.init.apply(this, arguments); }
     }
 }

 var Ajax = Factory.create();

 Ajax.prototype = {
     init: function (successCallback, failureCallback) {
         this.xhr = this.createXMLHttpRequest();
         var xhrTemp = this.xhr;
         var successFunc = null;
         var failFunc = null;

         if (successCallback != null && typeof successCallback == "function") {
             successFunc = successCallback;
         }

         if (failureCallback != null && typeof failureCallback == "function") {
             failFunc = failureCallback;
         }

         this.get.apply(this, arguments);
         this.post.apply(this, arguments);

         this.xhr.onreadystatechange = function () {
             if (xhrTemp.readyState == ) {
                 if (xhrTemp.status == ) {
                     if (successFunc != null) {
                         successFunc(xhrTemp.responseText, xhrTemp.responseXML);
                     }
                 }
                 else {
                     if (failFunc != null) {
                         failFunc(xhrTemp.status);
                     }
                 }
             }
         }
     },
     get: function (url, async) {
         this.xhr.open("GET", url, async);
         this.xhr.send();
     },
     createXMLHttpRequest: function () {
         if (window.XMLHttpRequest) {
             return new XMLHttpRequest();
         }
         else {
             return new ActiveXObject("Microsoft.XMLHTTP");
         }

         throw new Error("Ajax is not supported by the browser!");
     },
     post: function (url, data, async) {
         this.xhr.open("POST", url, async);
         this.xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
         this.xhr.send(data);
     },
     random: function (length) {
         var array = new Array("", "", "", "", "", "", "", "", "");
         var len = parseInt(length);
         var key = "";

         for (var i = ; i < len; i++) {
             key += Math.floor(Math.random() * );
         }

         return key;
     }
 }

对于GET与POST方法使用如下:

       function get() {
            var ajax = new Ajax(success,fail);
            ajax.get("Scripts/Util.js", true);
        }

        function post() {
            var ajax = new Ajax(success, fail);
            ajax.post("AjaxService.asmx/GetArgs","name=jasen", true);
        }

        function success(responseText, responseXML) {
            alert("result:" + responseText);
        }

        function fail(status) {
            alert("status:" + status);
        }

以上仅为练习随笔，仅供参考....