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我将如何调整此代码以在不使用表单的情况下运行，而是使用 prompt() 方法？通过包含提示而不是表单来要求用户输入。

<html>
    <head>
        <title>Login page</title>
    </head>
    <body>
        <h1 style="font-family:Comic Sans Ms;text-align="center";font-size:20pt; color:#00FF00;>Simple Login Page</h1>
        <form name="login">
            Username<input type="text" name="userid"/>
            Password<input type="password" name="pswrd"/>
            <input type="button" onclick="check(this.form)" value="Login"/>
            <input type="reset" value="Cancel"/>
        </form>
        <script language="javascript">
            function check(form)/*function to check userid & password*/ {
                /*the following code checkes whether the entered userid and password are matching*/
                if(form.userid.value == "myuserid" && form.pswrd.value == "mypswrd") {
                    window.open('target.html')/*opens the target page while Id & password matches*/
                }
                else {
                    alert("Error Password or Username")/*displays error message*/
                }
            }
        </script>
    </body>
</html>

谢谢！

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