Views/Admin/Index.cshtml

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@{
    Layout = null;
}


<!DOCTYPE html>
<html>

<head>
    <title>后台管理</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="keywords" content=" Master  Login Form Widget Tab Form,Login Forms,Sign up Forms,Registration Forms,News letter Forms,Elements" />
    <script type="application/x-javascript"> addEventListener("load", function() { setTimeout(hideURLbar, 0); }, false); function hideURLbar(){ window.scrollTo(0,1); } </script>
    <link href="css/style.css" rel="stylesheet" type="text/css" media="all" />
    <link href="//fonts.googleapis.com/css?family=Cormorant+SC:300,400,500,600,700" rel="stylesheet">
    <link href="//fonts.googleapis.com/css?family=Open+Sans:300,300i,400,400i,600,600i,700,700i,800,800i" rel="stylesheet">
</head>

<body>
    <div class="padding-all">
        <div class="header">
            <h1>Welcome to login</h1>
        </div>

        <div class="design-w3l">
            <div class="mail-form-agile">

                <input type="text" id="uname" placeholder="User Name  or  email..." required="" />
                <input type="password" id="upwd" class="padding" placeholder="Password" required="" />
                <input type="submit" value="login" onclick="login()">

            </div>
            <div class="clear" id="error" style="background-color:crimson;"> </div>
        </div>

        <div class="footer">
            <p><a href="https://github.com/">  github </a></p>
        </div>
    </div>
</body>
</html>
<script type="text/javascript">
    function login() {
        let name = document.getElementById("uname").value;
        let password = document.getElementById("upwd").value;

        let info = "uname=" + name + "&upwd=" + password;


        var xhr = new XMLHttpRequest;//创建一个 XMLHttpRequest 对象，XMLHttpRequest是实现ajax的基础
        xhr.open("POST", "/Admin/Index", true)//请求方式为"Post","/Home/Index"为服务器地址（在MVC这里就是控制器地址+方法名），true表示选择异步
        xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded")//设置请求参数类型
        xhr.setRequestHeader("uname", name)
        xhr.setRequestHeader("upwd", password)
        xhr.send();

        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4 && xhr.status == 200) {