窗口调整大小后的jQuery悬停功能无法更改为单击功能

Question

我已经制作了一个有两种状态的菜单 - 大小大于或等于1025px，下拉子菜单通过悬停在它们上面打开，这很好，另一方面，尺寸小于1025px，子菜单打开点击它们。问题在于后一种情况，当以小于1025px的大小调整浏览器大小时，悬停功能仍然占优势，并且只有在刷新浏览器后，点击功能才会生效，一切正常，直到我再次调整浏览器大小1025px大小，然后再次调整大小小于1025px大小。我将不胜感激。谢谢， CP

$(function() {
  var isMobile = false;
  $(window).resize(function() {
    if ($(window).width() >= 1025) {
      isMobile = false;
      $('nav li').hover(
        function() {
          $('ul', this).stop().slideToggle(150);
        });
    } else {
      isMobile = true;
      $("nav li").click(function() {
        $('ul', this).stop().slideToggle(150);
      });
    };
  });
  $(window).resize(); // Trigger window resize to check on load
});

@import url(https://fonts.googleapis.com/css?family=Roboto:400,700,500);

/* main Styles */

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  background: #fafafa;
  font-family: "Roboto", sans-serif;
  font-size: 14px;
  margin: 0;
}

a {
  text-decoration: none;
}

.container {
  width: 1000px;
  margin: auto;
}

h1 {
  text-align: center;
  margin-top: 150px;
}


/* Navigation Styles */

nav {
  background: #2ba0db;
}

nav ul {
  font-size: 0;
  margin: 0;
  padding: 0;
  display: block;
}

nav ul li {
  display: block;
  width: 100%;
}

nav ul li a {
  color: #fff;
  display: block;
  font-size: 14px;
  padding: 15px 14px;
  transition: 0.08s linear;
}

nav ul li:hover {
  background: #126d9b;
}

nav ul li ul {
  display: none;
  border-bottom: 5px solid #2ba0db;
}

nav ul li ul li {
  border-top: 1px solid #444;
  display: block;
}

nav ul li ul li:first-child {
  border-top: none;
}

nav ul li ul li a {
  background: #373737;
  display: block;
  padding: 10px 14px;
}

nav ul li ul li a:hover {
  background: #126d9b;
}

nav .fa.fa-angle-down {
  margin-left: 6px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav>
  <div class="container">
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">About Us</a></li>
      <li> <a href="#">Categories<i class='fa fa-angle-down'></i></a>
        <ul>
          <li><a href="#">Category One</a></li>
          <li><a href="#">Category Two</a></li>
          <li><a href="#">Category Three</a></li>
        </ul>
      </li>
      <li> <a href="#">Services<i class='fa fa-angle-down'></i></a>
        <ul>
          <li><a href="#">Service One</a></li>
          <li><a href="#">Service Two</a></li>
          <li><a href="#">Service Three</a></li>
          <li><a href="#">Service Four</a></li>
          <li><a href="#">Service Five</a></li>
          <li><a href="#">Service Six</a></li>
        </ul>
      </li>
      <li><a href="#">Contact Us</a></li>
    </ul>
  </div>
</nav>