表单的密码匹配验证

如何解决表单的密码匹配验证

我已经添加了密码和确认密码字段和脚本验证，但验证不起作用，我想为密码字段添加特殊字符，请帮助

<script type="text/javascript">
    function confirmPassword() {
        var password = document.getElementById("txtpassword").value
        var confirmPassword = document.getElementById("txtconfirmpassword").value
        if(password != confirmPassword) {
            alert('Password Not Matching!');
        }
    }
</script>

 <div class="col-sm-6">
                    <div class="form-group mb-20">
                       <input type="password" required="" placeholder="Enter Password" class="form-control space" id="txtpassword" name="ActualPassword">
                    </div>
                  </div>
                  <div class="col-sm-6">
                    <div class="form-group mb-20">
                      <input type="password" required="" placeholder="Enter Confirm Password" class="form-control space" id="txtconfirmpassword" data-parsley-equalto="#txtconfirmpassword" data-parsley-error-message="Confirm password should be same as password.">
                    </div>
                  </div>