如何在项目范围内显示选项卡栏控制器的底部选项卡？

<div class="bottom-navbar">
  <a href="#" class="active">首页</a>
  <a href="#">消息</a>
  <a href="#">个人中心</a>
</div>

.bottom-navbar {
  position: fixed;
  bottom: 0;
  width: 100%;
  background-color: #f3f3f3;
  border-top: 1px solid #ccc;
  display: flex;
}

.bottom-navbar a {
  flex: 1;
  padding: 10px;
  text-align: center;
  text-decoration: none;
  color: #555;
}

.bottom-navbar a.active {
  color: #007bff;
  font-weight: bold;
}

var navbar = document.getElementsByClassName("bottom-navbar")[0];
var links = navbar.getElementsByTagName("a");

for (var i = 0; i < links.length; i++) {
  links[i].addEventListener("click", function() {
    var current = document.getElementsByClassName("active");
    current[0].className = current[0].className.replace(" active", "");
    this.className += " active";
  });
}