javascript - 显示下拉内容

Question

我的代码在单击时展开下拉列表以显示一组链接。共有三个不同的下拉菜单，每个下拉菜单都有一组不同的链接，当用户点击时会显示这些链接。

脚本在下面，但它不是动态的。什么是更好、更有效的脚本编写方式，以便在需要额外的下拉列表时无需添加？

$(".button-nav1").click(function() {
  $(".row1").toggle();
});

$(".button-nav2").click(function() {
  $(".row2").toggle();
});

$(".button-nav3").click(function() {
  $(".row3").toggle();
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div id="row1" class="button-nav1">Joe<span class="crt">&nbsp;▼</span>
</div>
<div class="row1 BGpadding">
  <ul class="2ndRESET">
    <li class="resetTWO"><strong>Overview</strong>
    </li>
    <li><strong>Training</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lorem Lipsum</a>
      </li>
    </ul>
    <li><strong>Toomy</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lipsum </a>
      </li>
      <li><a href="#">Loremu</a>
      </li>
      <li><a href="#">Lipsum</a>
      </li>
    </ul>
  </ul>
</div>
</div>

<div id="row2" class="button-nav2">Joe<span class="crt">&nbsp;▼</span>
</div>
<div class="row2 BGpadding">
  <ul class="2ndRESET">
    <li class="resetTWO"><strong>Overview</strong>
    </li>
    <li><strong>Training and Help</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lorem Lipsum</a>
      </li>
    </ul>
    <li><strong>Toomy</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lipsum </a>
      </li>
      <li><a href="#">Loremu</a>
      </li>
      <li><a href="#">Lipsum</a>
      </li>
    </ul>
  </ul>
</div>
</div>

<div id="row3" class="button-nav3">Joe<span class="crt">&nbsp;▼</span>
</div>
<div class="row3 BGpadding">
  <ul class="2ndRESET">
    <li class="resetTWO"><strong>Overview</strong>
    </li>
    <li><strong>Training</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lorem Lipsum</a>
      </li>
    </ul>
    <li><strong>Toomy</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lipsum </a>
      </li>
      <li><a href="#">Loremu</a>
      </li>
      <li><a href="#">Lipsum</a>
      </li>
    </ul>
  </ul>
</div>
</div>

Answer 1

您可以将 jquery 缩减为一个函数。首先收听 divs，它有一个以 button-nav 开头的类和 $("div[class^=button-nav]")查询。然后获取 id 并使用 $("."+$(this).attr('id')).toggle( );

$("div[class^=button-nav]").on('click',function() {
  $("."+$(this).attr('id')).toggle();
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div id="row1" class="button-nav1">Joe<span class="crt">&nbsp;▼</span>
</div>
<div class="row1 BGpadding">
  <ul class="2ndRESET">
    <li class="resetTWO"><strong>Overview</strong>
    </li>
    <li><strong>Training</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lorem Lipsum</a>
      </li>
    </ul>
    <li><strong>Toomy</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lipsum </a>
      </li>
      <li><a href="#">Loremu</a>
      </li>
      <li><a href="#">Lipsum</a>
      </li>
    </ul>
  </ul>
</div>
</div>

<div id="row2" class="button-nav2">Joe<span class="crt">&nbsp;▼</span>
</div>
<div class="row2 BGpadding">
  <ul class="2ndRESET">
    <li class="resetTWO"><strong>Overview</strong>
    </li>
    <li><strong>Training and Help</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lorem Lipsum</a>
      </li>
    </ul>
    <li><strong>Toomy</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lipsum </a>
      </li>
      <li><a href="#">Loremu</a>
      </li>
      <li><a href="#">Lipsum</a>
      </li>
    </ul>
  </ul>
</div>
</div>

<div id="row3" class="button-nav3">Joe<span class="crt">&nbsp;▼</span>
</div>
<div class="row3 BGpadding">
  <ul class="2ndRESET">
    <li class="resetTWO"><strong>Overview</strong>
    </li>
    <li><strong>Training</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lorem Lipsum</a>
      </li>
    </ul>
    <li><strong>Toomy</strong>
    </li>
    <ul class="resetTWO">
      <li><a href="#">Lipsum </a>
      </li>
      <li><a href="#">Loremu</a>
      </li>
      <li><a href="#">Lipsum</a>
      </li>
    </ul>
  </ul>
</div>
</div>