blocks|key|1554884|text|最突出的一点是，您使用的是UseHttpGet=true，但在您的jQuery代码中使用的是POST。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1554885|这里还有一个我创建的名为ASMX页面的测试页面。|1554886|[WebMethod]
public+Catalog[]+GetCatalog()
{
++++Catalog[]+catalog+=+new+Catalog[1];
++++Catalog+cat+=+new+Catalog();
++++cat.Author+=+"Jim";
++++cat.BookName+="His+Book";
++++catalog.SetValue(cat,+0);
++++return+catalog;
}

<script+type="text/javascript">
++++$(document).ready(function()+{
++++$.ajax({
++++++++++++type:+"POST",
++++++++++++url:+"default.asmx/GetCatalog",
++++++++++++cache:+false,
++++++++++++contentType:+"application/json;+charset=utf-8",
++++++++++++data:+"{}",
++++++++++++dataType:+"json",
++++++++++++success:+handleHtml,
++++++++++++error:+ajaxFailed
++++++++});
++++});

++++function+handleHtml(data,+status)+{
++++++++for+(var+count+in+data.d)+{
++++++++++++alert(data.d[count].Author);
++++++++++++alert(data.d[count].BookName);
++++++++}
++++}

++++function+ajaxFailed(xmlRequest)+{
++++++++alert(xmlRequest.status+%2B+'+\n\r+'+%2B+
++++++++++++++xmlRequest.statusText+%2B+'\n\r'+%2B+
++++++++++++++xmlRequest.responseText);
++++}
</script>|code-block|syntax|javascript|1554887|entityMap^0|D|F|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

One thing that stands out is you have <code>UseHttpGet=true</code> but in your jQuery code you are using POST.

Also here is a test page I created calling an ASMX page.

<pre><code>[WebMethod]
public Catalog[] GetCatalog()
{
 Catalog[] catalog = new Catalog[1];
 Catalog cat = new Catalog();
 cat.Author = "Jim";
 cat.BookName ="His Book";
 catalog.SetValue(cat, 0);
 return catalog;
}

&lt;script type="text/javascript"&gt;
 $(document).ready(function() {
 $.ajax({
 type: "POST",
 url: "default.asmx/GetCatalog",
 cache: false,
 contentType: "application/json; charset=utf-8",
 data: "{}",
 dataType: "json",
 success: handleHtml,
 error: ajaxFailed
 });
 });

 function handleHtml(data, status) {
 for (var count in data.d) {
 alert(data.d[count].Author);
 alert(data.d[count].BookName);
 }
 }

 function ajaxFailed(xmlRequest) {
 alert(xmlRequest.status + ' \n\r ' + 
 xmlRequest.statusText + '\n\r' + 
 xmlRequest.responseText);
 }
&lt;/script&gt;
</code></pre>

blocks|key|1339257|text|下面是一个对aspx页面方法的jQuery调用示例，但它类似于asmx页面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1339258|$.ajax(
++++{
++++++++type:+"POST",
++++++++url:+"NDQA.aspx/ValidateRoleName",
++++++++data:+'{"roleName":"'+%2B+$('[id$=RoleNameTextBox]').val()+%2B+'"}',
++++++++contentType:+"application/json;+charset=utf-8",
++++++++dataType:+"json",
++++++++success:+ValidateSuccess,
++++++++error:+ValidateError

++++});|code-block|syntax|javascript|1339259|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is an example of a jQuery call to a page method on an aspx, but it would be similar to an asmx page.

<pre><code>$.ajax(
 {
 type: "POST",
 url: "NDQA.aspx/ValidateRoleName",
 data: '{"roleName":"' + $('[id$=RoleNameTextBox]').val() + '"}',
 contentType: "application/json; charset=utf-8",
 dataType: "json",
 success: ValidateSuccess,
 error: ValidateError

 });
</code></pre>

blocks|key|1339311|text|我还建议按照Jim+Scott的建议删除UseHttpGet。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1339312|您可以将以下内容添加到您的选项中，并检查objXMLHttpRequest以查看更详细的错误响应。|1339313|error:+function(objXMLHttpRequest,+textStatus,+errorThrown)+{
+debugger;+++++++++++++++
}|code-block|syntax|javascript|1339314|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I would also suggest removing UseHttpGet as Jim Scott suggested.

You can add the following to your options and check the objXMLHttpRequest to see a more detailed error response.

<pre><code>error: function(objXMLHttpRequest, textStatus, errorThrown) {
 debugger; 
}
</code></pre>

blocks|key|1554990|text|您必须确保将Json指定为响应格式(如果这是您想要的格式)，并且由于security+features而摆脱了UseHttpGet|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1554991|[WebMethod]
[ScriptMethod(ResponseFormat=ResponseFormat.Json)]
public+string+GetSurvey()+{
++++return+"Question:+Who+is+Snoopy?";
}|code-block|syntax|javascript|1554992|entityMap|0|LINK|mutability|MUTABLE|url|http://weblogs.asp.net/scottgu/archive/2007/04/04/json-hijacking-and-how-asp-net-ajax-1-0-mitigates-these-attacks.aspx^0|1J|A|Y|H|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

You have to make sure you specify Json as the response format if that is what you want and get rid of <code>UseHttpGet</code> due to <a href="http://weblogs.asp.net/scottgu/archive/2007/04/04/json-hijacking-and-how-asp-net-ajax-1-0-mitigates-these-attacks.aspx" rel="noreferrer">security features</a>:

<pre><code>[WebMethod]
[ScriptMethod(ResponseFormat=ResponseFormat.Json)]
public string GetSurvey() {
 return "Question: Who is Snoopy?";
}
</code></pre>

blocks|key|1555062|text|我遇到了这个问题，也遇到了同样的问题。我通过添加以下内容解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1555063|[WebInvoke(Method="POST",ResponseFormat=WebMessageFormat.Json)]|code-block|syntax|javascript|1555064|在你的web方法属性下面，如果你想使用POST的话。即：|1555065|[WebService(Namespace+=+"http://tempuri.org/")]
[WebServiceBinding(ConformsTo+=+WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public+class+Survey+:+System.Web.Services.WebService+{

++++public+Survey+()+{
++++}

++++[WebMethod]
++++[WebInvoke(Method="POST",ResponseFormat=WebMessageFormat.Json)]
++++[ScriptMethod(UseHttpGet+=+true)]
++++public+string+GetSurvey()+{
++++++++return+"Question:+Who+is+Snoopy?";
++++}
}|1555066|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I came across this question and had the same issue. I solved it by adding:

<pre><code>[WebInvoke(Method="POST",ResponseFormat=WebMessageFormat.Json)]
</code></pre>

Below your web method attribute, if you'd like to use POST. ie:

<pre><code>[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class Survey : System.Web.Services.WebService {

 public Survey () {
 }

 [WebMethod]
 [WebInvoke(Method="POST",ResponseFormat=WebMessageFormat.Json)]
 [ScriptMethod(UseHttpGet = true)]
 public string GetSurvey() {
 return "Question: Who is Snoopy?";
 }
}
</code></pre>

blocks|key|1339476|text|如果你尝试chrome浏览器，试试internet+explorer它对我很有效，而且它也是关于chrome浏览器的，你必须在chrome中添加扩展，但是我不知道扩展的名字。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1339477|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you try chrome browser, try internet explorer it worked for me and also it is about chrome browser you must add extension to works in chrome but i dont know the name of extension

I am trying to call an ASMX method from jQuery without success. Following is my code, and I don't understand what I am missing.

File Something.js,

<pre><code>function setQuestion() {
 $.ajax({
 type: "POST",
 data: "{}",
 dataType: "json",
 url: "http: //localhost/BoATransformation/Survey.asmx/GetSurvey",
 contentType: "application/json; charset=utf-8",
 success: onSuccess
 });
}

function onSuccess(msg) {
 $("#questionCxt").append(msg);
}
</code></pre>

File SomethingElse.cs,

<pre><code>[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class Survey : System.Web.Services.WebService {

 public Survey () {
 }

 [WebMethod]
 [ScriptMethod(UseHttpGet = true)]
 public string GetSurvey() {
 return "Question: Who is Snoopy?";
 }
}
</code></pre>

Calling ASMX from jQuery

jQuery

我正在尝试从jQuery调用ASMX方法，但没有成功。以下是我的代码，我不明白我遗漏了什么。文件Something.js，function setQuestion() {    $.ajax({        type: "POST",        data: "{}",        dataType: "json...

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