js与jQuery实现的兼容多浏览器Ajax请求实例

var ajax = function() {};
ajax.prototype = {
    request: function(method, url, callback, postVars) {
        var xhr = this.createXhrObject();
        xhr.onreadystatechange = function() {
            if (xhr.readyState !== 4) return;
            (xhr.status === 200) ?
                callback.success(xhr.responseText, xhr.responseXML) :
                callback.failure(xhr,status);
        };
        if (method !== "POST") {
            url += "?" + JSONStringify(postVars);
            postVars = null;
        }
        xhr.open(method, url, true);
        xhr.send(postVars);
    },
    createXhrObject: function() {
        var methods = [
            function() { return new XMLHttpRequest(); },
            function() { return new ActiveXObject("Msxml2.XMLHTTP"); },
            function() { return new ActiveXObject("Microsoft.XMLHTTP"); }
        ],
        i = 0,
        len = methods.length;
        for (; i < len; i++) {
            try {
                methods[i];
            } catch(e) {
                continue;
            }
            this.createXhrObject = methods[i];
            return methods[i];
        }
        throw new Error("ajax created failure");
    },
    JSONStringify: function(obj) {
        return JSON.stringify(obj).replace(/"|{|}/g, "")
                    .replace(/b:b/g, "=")
                    .replace(/b,b/g, "&");
    }
};

   <script type="text/javascript">
        function Text_ajax()
        {
           $.ajax(
           {
              type:"GET",//通常会用到两种：GET,POST。默认是：GET
              url:"ResponseText.aspx",//(默认: 当前页地址) 发送请求的地址
              dataType:"html",//预期服务器返回的数据类型。
              beforeSend:beforeSend, //发送请求
              success:callback, //请求成功
              error:error,//请求出错
              complete:complete//请求完成
             
           });
        }
        function error(XMLHttpRequest, textStatus, errorThrown)
        {
              // 通常情况下textStatus和errorThown只有其中一个有值
              $("#showResult").append("<div>请求出错啦！</div>");
        }
        function complete(XMLHttpRequest, textStatus)
        { 
              $("#showResult").append("<div>请求完成</div>");
        }
        function beforeSend(XMLHttpRequest)
        {
              $("#showResult").append("<div>发送请求…..<div>");
              
        }
        function callback(msg)
        {
              $("#showResult").append("<div>请求成功，回传数:"+msg+"<div>");        
        }
    </script>

　 <input value="Text_ajax函数" type="button" onclick="Text_ajax()"/>
    <div id="showResult">   
</div>

　 protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write("呵呵！测试成功啦！");
    }

data:{id:1, type:encodeURI(encodeURI('商品'))}

String type = request.getParameter("type");
type = URLDecoder.decode(type, "UTF-8");

contentType: "application/x-www-form-urlencoded; charset=UTF-8″