$.ajax({
url: '/Handler.ashx?operFlag=test',
type: 'POST',
/*
请求ashx文件的时候 要把contentType去掉，还有就是
data 格式为 {”key”,”value”};切记 不要再 大括号外面加双引号，
这样就会在ashx页面取不到数据而失败
*/
//contentType: 'application/json; charset=utf',
data: {
"key": "xdp",
"key":"孤傲苍狼" 
},
cache: false,
dataType: 'text',
success: function (data) {
alert(data);
},
error: function (xhr) {
alert("出现错误，请稍后再试:" + xhr.responseText);
}
}); 

string key = context.Request["key"];
string key = context.Request["key"]; 

$.ajax({
url: '/Handler.ashx?operFlag=test',
type: 'POST',
//JSON.stringify格式化参数
data: JSON.stringify({
"key": "xdp-gacl",
"key": "白虎神皇"
}),
contentType: 'application/json; charset=utf',
cache: false,
dataType: 'json',
success: function (data) {
alert(data.key + "|" + data.key);
},
error: function (xhr) {
alert("出现错误，请稍后再试:" + xhr.responseText);
}
}); 

$.ajax({
url: '/Handler.ashx?operFlag=test',
type: 'POST',
//JSON.stringify格式化参数
data: JSON.stringify({
"key": "xdp-gacl",
"key": "白虎神皇"
}),
//contentType: 'application/json; charset=utf',
cache: false,
dataType: 'json',
success: function (data) {
alert(data.key + "|" + data.key);
},
error: function (xhr) {
alert("出现错误，请稍后再试:" + xhr.responseText);
}
}); 

/// <summary>
/// 获取参数
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
private Dictionary<String, Object> GetParameter(HttpContext context)
{
StreamReader reader = new StreamReader(context.Request.InputStream);
//得到json字符串：strJson={"key":"xdp-gacl","key":"白虎神皇"}
String strJson = HttpUtility.UrlDecode(reader.ReadToEnd());
JavaScriptSerializer jss = new JavaScriptSerializer();
//将json字符串反序列化成一个Dictionary对象
Dictionary<String, Object> dicParameter = jss.Deserialize<Dictionary<String, Object>>(strJson);
return dicParameter;
} 

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string operFlag = context.Request["operFlag"];
if (operFlag == "test")
{
string key = context.Request["key"];
string key = context.Request["key"];
string resStr = key + "|" + key;
context.Response.Write(resStr);
}
else if (operFlag == "test")
{
Dictionary<String, Object> dicParameter = GetParameter(context);
string key = dicParameter["key"].ToString();
string key = dicParameter["key"].ToString();
string resStr = "{\"key\":\"" + key + "\", \"key\":\"" + key + "\"}";
context.Response.Write(resStr);
}
}