處理get請求后返回json的求教？

新建建Web服務頁面（*.asmx）

函數如下：

[WebMethod]

public string HelloWorld()

{

return "Hello World";

}

js調用如下：

$.ajax({

type: "POST",

url: "/Webservice/test.asmx/HelloWorld",

data: "{'Product_ID':'" + ProductID + "'}",

contentType: "application/json; charset=utf-8",

dataType: "json",

success: function (msg) {

try {

//do something

} catch (e) {

}

},

error: function () {

return false;

}

});