xmlhttp.status值为500

在页面异步访问WebService时，总时失败xmlhttp.status值为500，说是访问服务器异常，最后才发现需要在WebConfig文件中<ystem.web>中加入以下配置 就OK了，原因应该是之前没有声明，所以没有权限吧

???? <webServices>

????????????? <protocols>

?????????????????? <addname="HttpPost" />

?????????????????? <addname="HttpGet" />

????????????? </protocols>

???????? </webServices>

示例代码如下：

function?timepp()

{

??

??var dataLeft=0;

???var xmlhttp = newActiveXObject("Microsoft.XMLHTTP");

???var URL = "WebService/DogCheck.asmx/GetDayLeft";

????

???xmlhttp.Open("GET",URL, false? );

???xmlhttp.send(null);

???var result = xmlhttp.status;

???var x = xmlhttp.responseXML; ??

???if (result == 200) {? ?

???????if(x.childNodes[1].text=="" )

???????{

??????????? window .clearInterval(interval);

??????????? //修改内容

??????????? //$('#mintbar').slideDown();

????????????//???? $.error( "加密狗信息读取失败，请联系开发商！","系统提示！");

???????????? location = "Login.aspx";

???????????? return;

???????}

???????else

???????{

??????????dataLeft=parseInt(x.childNodes[1].text );

???????}

???}

???else {

???alert("请求错误："+ result,"系统提示");

??????// $.error("请求错误：" + result,"系统提示");

???}?

?}