Ajax()방법 은 배경 과 어떻게 상호작용 합 니까?

$.ajax({
type: "GET",
url: "handleAjaxRequest.action",
data: {paramKey:paramValue},
async: true,
dataType:"json",
success: function(returnedData) {
alert(returnedData);
//          
//returnedData--      ，    dataType           ；
//             
},
error: function(e) {
alert(e);
//          
}
});
}

var chinese = "  ";
var urlTemp = "handleAjaxRequest.action?chinese="+chinese;
var url = encodeURI(urlTemp);//    
$.ajax({
type: "GET",
url: url,//       url
success: function(returnedData) {
alert(returnedData);
//          
//returnedData--      ，    dataType           ；
//             
},
error: function(e) {
alert(e);
//          
}
});
} 

public void handleAjaxRequest() {
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
//       html    
response.setContentType("text/html;charset=utf-");
response.setHeader("pragma", "no-cache");
response.setHeader("cache-control", "no-cache");
PrintWriter out =null;
try {
String chinese = request.getParameter("chinese");
//      ，      
chinese = new String(chinese.getBytes("ISO--"),"utf-");
System.out.println("chinese is : "+chinese);
//    
String resultData = "hello world";
out = response.getWriter();
out.write(resultData);
//    json  ，response.setContentType("application/json;charset=utf-");
//Gson gson = new Gson();
//String result = gson.toJson(resultData);// Gson      json  
//out.write(result);
out.flush();
}catch(Exception e) {
e.printStackTrace();
}finally {
if(out != null) {
out.close();
}
}
}

<action name="handleAjaxRequest" class="com.test.TestAction"
method="handleAjaxRequest">
</action>

using System.Web.Script.Services; 
public static string GetStr(string str1, string str2) 
{ 
return str1 + str2; 
}

function Test(strMsg1,strMsg2) 
{
$.ajax({
type: "Post",
url: "Demo.aspx/GetStr",
async: true,
//           ，     ，     ，      ，str1      ,str2          
data: "{'str1':'"+strMsg1+"','str2':'"+strMsg2+"'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//      data.d     
alert(data.d);
},
error: function(err) {
alert(err);
}
});
　　//      
$("#pageloading").hide();
}

using System.Web.Script.Services; 
public static string GetStr(string str1, string str2) 
{ 
return str1 + str2; 
}

function Test(strMsg1,strMsg2) 
{
　var str = “”;
$.ajax({
type: "Post",
url: "Demo.aspx/GetStr",
async: false,
//           ，     ，     ，      ，str1      ,str2          
data: "{'str1':'"+strMsg1+"','str2':'"+strMsg2+"'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//      data.d     
str = data.d;
},
error: function(err) {
alert(err);
}
});
　return str;