如何通过AJAX调用ASP.NET WebMethod (原生JS)

using System.Web.Services;

public partial class YourPage : System.Web.UI.Page
{
    [WebMethod]
    public static string YourWebMethod(string parameter)
    {
        // 处理逻辑并返回结果
        return "Hello " + parameter;
    }
}

function callWebMethod() {
    var parameter = "World";

    var xhr = new XMLHttpRequest();
    xhr.open("POST", "YourPage.aspx/YourWebMethod", true);
    xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    xhr.onreadystatechange = function () {
        if (xhr.readyState === 4 && xhr.status === 200) {
            var response = JSON.parse(xhr.responseText);
            console.log(response.d); // 输出结果
        }
    };
    xhr.send(JSON.stringify({ parameter: parameter }));
}

<button onclick="callWebMethod()">调用WebMethod</button>