注册表单验证未重定向到目标页面

Question

以下是我为验证密码而创建的功能。在验证有效的同时，下一个函数link（）将覆盖它并继续进行，而不考虑验证。

    <script>
        // insert validation on signup and login forms here
            // password validation variables

                function validatePassword() {

                var pswrd = document.getElementById("pswrd").value;
                var pswrdrpt = document.getElementById("pswrdrpt").value;
                pswrd.onchange = validatePassword;
                pswrdrpt.onkeyup = validatePassword;
                if(pswrd == "" || pswrd == null) {
                    alert("incorrect input");
                    return;
                } else {

                }
            //     if(pswrd != pswrdrpt) {
            //     alert("Passwords don't match");
            //     return;

            // } else (pswrd =""){
            //     alert("Incorrect input");
            // } else {

            // }

        // pswrd.onchange = validatePassword;
        // pswrdrpt.onkeyup = validatePassword;
   }

   function link() {
    //    alert(1);
                // if(!validatePassword()) {
                // return; 
                // } else {
                    window.location.href = "homepage.html";
                }

        // This where you pick it up from 

        </script>

以下是link（）应该执行的形式的代码-

            <form class="modal-content animate" method = "POST" action = "link()">  <!-- Same as above, just testing action -->
            <div class="container">
            <h1>Sign up</h1>
            <p>Please fill this form to join us on the other side</p>
            <hr>
            <label for="Username"><b>Username</b></label>
            <input id="usrnm" type="text" placeholder="Use your creativity" name="Username" required/>

            <label for="psw"><b>Password</b></label>
            <input id="pswrd" type="password" minlength="4" placeholder="Keep it simple please" name="psw" required/>

            <label for="pswRepeat"><b>Repeat Password</b></label>
            <input id="pswrdrpt" type="password" placeholder="Again" name="pswRepeat" onblur="validatePassword()" required/>

            <label>
                <input type="checkbox" checked="checked" name="remember" style="margin-bottom:15px">Remeber me!
            </label>
            <p> By creating an account you agree to up your level of awesome!</p>
            <div class="clearfix">
                <button type="button" onclick="document.getElementById('signUp').style.display='none'" class="cancelbtn">?????</button>
                <button type="submit" onclick="link()" class="signupbtn">Hook me up fam</button>
            </div>
        </div>
    </form>

除非不是。我还在页面末尾使用了一些jQuery插件，如果我发表评论，它们会引至this page with the jQuery alongside it

请让我知道我能做什么，谢谢您的时间和帮助。