导航栏

一个响应式水平导航栏，可支持图像、链接、按钮和下拉菜单

navbar 组件是一个响应式且多功能的水平导航栏，具有以下结构

navbar 主容器
- navbar-brand 左侧，始终可见，通常包含徽标，还可以包含一些链接或图标
  - navbar-burger 汉堡图标，用于在触控设备上切换导航栏菜单
- navbar-menu 右侧，在触控设备上隐藏，在台式机上可见
  - navbar-start 菜单的左侧部分，在台式机上显示在导航栏品牌旁边
  - navbar-end 菜单的右侧部分，显示在导航栏的末尾
    - navbar-item 导航栏的每个单个项目，可以是 a 或 div
      - navbar-link 带有箭头的下拉菜单的链接，作为其兄弟元素
      - navbar-dropdown下拉菜单，可以包括导航栏项目和分隔符
        
        navbar-divider 用于分隔导航栏项目的水平线

为了快速上手，以下是一个完整的基本导航栏的外观

<nav class="navbar" role="navigation" aria-label="main navigation">
  <div class="navbar-brand">
    <a class="navbar-item" href="https://bulma.org.cn">
      <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M170 132.571V27.5908C170 25.5451 170.915 23.93 172.746 22.7456C174.576 21.5612 176.729 20.969 179.206 20.969H210.377C232.019 20.969 242.84 30.4441 242.84 49.3943C242.84 62.5303 238.264 71.0902 229.112 75.074C234.603 77.2275 238.748 80.2692 241.548 84.1992C244.347 88.1292 245.747 93.8627 245.747 101.4V104.791C245.747 116.743 242.84 125.437 237.026 130.875C231.211 136.312 223.351 139.031 213.445 139.031H179.206C176.514 139.031 174.307 138.385 172.584 137.093C170.861 135.801 170 134.293 170 132.571ZM190.834 120.619H209.085C219.529 120.619 224.751 114.751 224.751 103.015V100.431C224.751 94.401 223.432 90.0404 220.794 87.3486C218.156 84.6568 214.253 83.3109 209.085 83.3109H190.834V120.619ZM190.834 66.8371H208.923C213.122 66.8371 216.326 65.5989 218.533 63.1225C220.74 60.646 221.844 57.2544 221.844 52.9475C221.844 48.7483 220.686 45.4374 218.371 43.0148C216.057 40.5922 212.853 39.3809 208.762 39.3809H190.834V66.8371ZM260.283 103.015V27.4293C260.283 25.2759 261.306 23.6608 263.351 22.5841C265.397 21.5074 267.873 20.969 270.781 20.969C273.688 20.969 276.164 21.5074 278.21 22.5841C280.256 23.6608 281.279 25.2759 281.279 27.4293V103.015C281.279 115.397 287.2 121.588 299.044 121.588C310.888 121.588 316.81 115.397 316.81 103.015V27.4293C316.81 25.2759 317.833 23.6608 319.879 22.5841C321.925 21.5074 324.401 20.969 327.308 20.969C330.215 20.969 332.692 21.5074 334.738 22.5841C336.783 23.6608 337.806 25.2759 337.806 27.4293V103.015C337.806 115.72 334.28 125.061 327.227 131.036C320.175 137.012 310.781 140 299.044 140C287.308 140 277.914 137.039 270.861 131.117C263.809 125.195 260.283 115.828 260.283 103.015ZM356.703 132.409V27.4293C356.703 25.2759 357.725 23.6608 359.771 22.5841C361.817 21.5074 364.293 20.969 367.201 20.969C370.108 20.969 372.584 21.5074 374.63 22.5841C376.676 23.6608 377.699 25.2759 377.699 27.4293V120.619H417.106C419.044 120.619 420.579 121.534 421.709 123.365C422.84 125.195 423.405 127.349 423.405 129.825C423.405 132.301 422.84 134.455 421.709 136.285C420.579 138.116 419.044 139.031 417.106 139.031H365.908C363.432 139.031 361.279 138.439 359.448 137.254C357.618 136.07 356.703 134.455 356.703 132.409ZM434.872 132.409V31.467C434.872 27.9138 435.868 25.2759 437.86 23.5532C439.852 21.8304 442.355 20.969 445.37 20.969C449.354 20.969 452.423 21.6689 454.576 23.0686C456.729 24.4684 459.098 27.4832 461.682 32.1131L481.548 68.2907L501.413 32.1131C503.997 27.4832 506.393 24.4684 508.6 23.0686C510.808 21.6689 513.903 20.969 517.887 20.969C520.902 20.969 523.405 21.8304 525.397 23.5532C527.389 25.2759 528.385 27.9138 528.385 31.467V132.409C528.385 134.455 527.335 136.07 525.236 137.254C523.136 138.439 520.686 139.031 517.887 139.031C514.98 139.031 512.503 138.439 510.458 137.254C508.412 136.07 507.389 134.455 507.389 132.409V62.961L488.493 96.5545C486.985 99.354 484.616 100.754 481.386 100.754C478.264 100.754 475.949 99.354 474.441 96.5545L455.868 61.6689V132.409C455.868 134.455 454.818 136.07 452.719 137.254C450.619 138.439 448.17 139.031 445.37 139.031C442.463 139.031 439.987 138.439 437.941 137.254C435.895 136.07 434.872 134.455 434.872 132.409ZM539.529 130.31C539.529 130.094 539.637 129.556 539.852 128.694L571.023 27.1063C571.669 24.8452 573.257 23.0956 575.787 21.8573C578.318 20.6191 581.198 20 584.428 20C587.658 20 590.565 20.6191 593.149 21.8573C595.734 23.0956 597.349 24.8452 597.995 27.1063L629.166 128.694C629.381 129.556 629.489 130.094 629.489 130.31C629.489 132.678 628.035 134.724 625.128 136.447C622.221 138.17 619.26 139.031 616.245 139.031C612.261 139.031 609.892 137.631 609.139 134.832L603.001 113.351H566.016L559.879 134.832C559.125 137.631 556.756 139.031 552.773 139.031C549.65 139.031 546.662 138.197 543.809 136.528C540.956 134.859 539.529 132.786 539.529 130.31ZM570.377 96.8775H598.479L584.428 47.2948L570.377 96.8775Z" fill="black" class="bd-svg-black" />
  <path fill-rule="evenodd" clip-rule="evenodd" d="M0 110L10 40L50 0L100 50L70 80L110 120L50 160L0 110Z" fill="#00D1B2"/>
</svg>

    </a>

    <a role="button" class="navbar-burger" aria-label="menu" aria-expanded="false" data-target="navbarBasicExample">
      <span aria-hidden="true"></span>
      <span aria-hidden="true"></span>
      <span aria-hidden="true"></span>
      <span aria-hidden="true"></span>
    </a>
  </div>

  <div id="navbarBasicExample" class="navbar-menu">
    <div class="navbar-start">
      <a class="navbar-item">
        Home
      </a>

      <a class="navbar-item">
        Documentation
      </a>

      <div class="navbar-item has-dropdown is-hoverable">
        <a class="navbar-link">
          More
        </a>

        <div class="navbar-dropdown">
          <a class="navbar-item">
            About
          </a>
          <a class="navbar-item is-selected">
            Jobs
          </a>
          <a class="navbar-item">
            Contact
          </a>
          <hr class="navbar-divider">
          <a class="navbar-item">
            Report an issue
          </a>
        </div>
      </div>
    </div>

    <div class="navbar-end">
      <div class="navbar-item">
        <div class="buttons">
          <a class="button is-primary">
            <strong>Sign up</strong>
          </a>
          <a class="button is-light">
            Log in
          </a>
        </div>
      </div>
    </div>
  </div>
</nav>

navbar-brand 是导航栏的左侧。它可以包含

多个 navbar-item
navbar-burger 作为最后一个子元素

<nav class="navbar" role="navigation" aria-label="main navigation">
  <div class="navbar-brand">
    <!-- navbar items, navbar burger... -->
  </div>
</nav>

导航栏品牌始终可见：在触控设备 < 1024px 和桌面 >= 1024px 上。因此，建议仅使用几个导航栏项目，以避免在小设备上水平溢出。

<nav class="navbar" role="navigation" aria-label="main navigation">
  <div class="navbar-brand">
    <a class="navbar-item" href="https://bulma.org.cn">
      <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M170 132.571V27.5908C170 25.5451 170.915 23.93 172.746 22.7456C174.576 21.5612 176.729 20.969 179.206 20.969H210.377C232.019 20.969 242.84 30.4441 242.84 49.3943C242.84 62.5303 238.264 71.0902 229.112 75.074C234.603 77.2275 238.748 80.2692 241.548 84.1992C244.347 88.1292 245.747 93.8627 245.747 101.4V104.791C245.747 116.743 242.84 125.437 237.026 130.875C231.211 136.312 223.351 139.031 213.445 139.031H179.206C176.514 139.031 174.307 138.385 172.584 137.093C170.861 135.801 170 134.293 170 132.571ZM190.834 120.619H209.085C219.529 120.619 224.751 114.751 224.751 103.015V100.431C224.751 94.401 223.432 90.0404 220.794 87.3486C218.156 84.6568 214.253 83.3109 209.085 83.3109H190.834V120.619ZM190.834 66.8371H208.923C213.122 66.8371 216.326 65.5989 218.533 63.1225C220.74 60.646 221.844 57.2544 221.844 52.9475C221.844 48.7483 220.686 45.4374 218.371 43.0148C216.057 40.5922 212.853 39.3809 208.762 39.3809H190.834V66.8371ZM260.283 103.015V27.4293C260.283 25.2759 261.306 23.6608 263.351 22.5841C265.397 21.5074 267.873 20.969 270.781 20.969C273.688 20.969 276.164 21.5074 278.21 22.5841C280.256 23.6608 281.279 25.2759 281.279 27.4293V103.015C281.279 115.397 287.2 121.588 299.044 121.588C310.888 121.588 316.81 115.397 316.81 103.015V27.4293C316.81 25.2759 317.833 23.6608 319.879 22.5841C321.925 21.5074 324.401 20.969 327.308 20.969C330.215 20.969 332.692 21.5074 334.738 22.5841C336.783 23.6608 337.806 25.2759 337.806 27.4293V103.015C337.806 115.72 334.28 125.061 327.227 131.036C320.175 137.012 310.781 140 299.044 140C287.308 140 277.914 137.039 270.861 131.117C263.809 125.195 260.283 115.828 260.283 103.015ZM356.703 132.409V27.4293C356.703 25.2759 357.725 23.6608 359.771 22.5841C361.817 21.5074 364.293 20.969 367.201 20.969C370.108 20.969 372.584 21.5074 374.63 22.5841C376.676 23.6608 377.699 25.2759 377.699 27.4293V120.619H417.106C419.044 120.619 420.579 121.534 421.709 123.365C422.84 125.195 423.405 127.349 423.405 129.825C423.405 132.301 422.84 134.455 421.709 136.285C420.579 138.116 419.044 139.031 417.106 139.031H365.908C363.432 139.031 361.279 138.439 359.448 137.254C357.618 136.07 356.703 134.455 356.703 132.409ZM434.872 132.409V31.467C434.872 27.9138 435.868 25.2759 437.86 23.5532C439.852 21.8304 442.355 20.969 445.37 20.969C449.354 20.969 452.423 21.6689 454.576 23.0686C456.729 24.4684 459.098 27.4832 461.682 32.1131L481.548 68.2907L501.413 32.1131C503.997 27.4832 506.393 24.4684 508.6 23.0686C510.808 21.6689 513.903 20.969 517.887 20.969C520.902 20.969 523.405 21.8304 525.397 23.5532C527.389 25.2759 528.385 27.9138 528.385 31.467V132.409C528.385 134.455 527.335 136.07 525.236 137.254C523.136 138.439 520.686 139.031 517.887 139.031C514.98 139.031 512.503 138.439 510.458 137.254C508.412 136.07 507.389 134.455 507.389 132.409V62.961L488.493 96.5545C486.985 99.354 484.616 100.754 481.386 100.754C478.264 100.754 475.949 99.354 474.441 96.5545L455.868 61.6689V132.409C455.868 134.455 454.818 136.07 452.719 137.254C450.619 138.439 448.17 139.031 445.37 139.031C442.463 139.031 439.987 138.439 437.941 137.254C435.895 136.07 434.872 134.455 434.872 132.409ZM539.529 130.31C539.529 130.094 539.637 129.556 539.852 128.694L571.023 27.1063C571.669 24.8452 573.257 23.0956 575.787 21.8573C578.318 20.6191 581.198 20 584.428 20C587.658 20 590.565 20.6191 593.149 21.8573C595.734 23.0956 597.349 24.8452 597.995 27.1063L629.166 128.694C629.381 129.556 629.489 130.094 629.489 130.31C629.489 132.678 628.035 134.724 625.128 136.447C622.221 138.17 619.26 139.031 616.245 139.031C612.261 139.031 609.892 137.631 609.139 134.832L603.001 113.351H566.016L559.879 134.832C559.125 137.631 556.756 139.031 552.773 139.031C549.65 139.031 546.662 138.197 543.809 136.528C540.956 134.859 539.529 132.786 539.529 130.31ZM570.377 96.8775H598.479L584.428 47.2948L570.377 96.8775Z" fill="black" class="bd-svg-black" />
  <path fill-rule="evenodd" clip-rule="evenodd" d="M0 110L10 40L50 0L100 50L70 80L110 120L50 160L0 110Z" fill="#00D1B2"/>
</svg>

    </a>

    <a role="button" class="navbar-burger" aria-label="menu" aria-expanded="false">
      <span aria-hidden="true"></span>
      <span aria-hidden="true"></span>
      <span aria-hidden="true"></span>
      <span aria-hidden="true"></span>
    </a>
  </div>
</nav>

在桌面 >= 1024px 上，导航栏品牌只会占用它需要的空间。

navbar-burger 是仅出现在触控设备上的汉堡包菜单。它必须作为 navbar-brand 的最后一个子元素出现。它必须包含四个空的 span 标签，以便可视化汉堡包线条或叉号（处于活动状态时）。

<a class="navbar-burger" role="button" aria-label="menu" aria-expanded="false">
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
</a>

你可以添加修改器类 is-active 将其变为叉号。

<a class="navbar-burger is-active" role="button" aria-label="menu" aria-expanded="false">
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
</a>

navbar-menu 是导航栏品牌的对应部分。因此，它必须作为 navbar 的直接子元素出现，作为 navbar-brand 的兄弟元素。

<nav class="navbar" role="navigation" aria-label="main navigation">
  <div class="navbar-brand">
    <!-- navbar items, navbar burger... -->
  </div>
  <div class="navbar-menu">
    <!-- navbar start, navbar end -->
  </div>
</nav>

navbar-menu 在触控设备 < 1024px 上隐藏。你需要添加修改器类 is-active 来显示它。

<div class="navbar-menu">
  <!-- hidden on mobile -->
</div>

<div class="navbar-menu is-active">
  <!-- shown on mobile -->
</div>

在桌面 >= 1024px 上，navbar-menu 将填满导航栏中可用的空间，只给导航栏品牌留下它需要的空间。但是，它需要两个元素作为直接子元素

navbar-start
navbar-end

Javascript 切换

Bulma 包不包含任何 JavaScript。
不过，这里有一个实现示例，它在 Vanilla Javascript 中对 navbar-burger 和目标 navbar-menu 同时切换 is-active 类。

<a role="button" class="navbar-burger" data-target="navMenu" aria-label="menu" aria-expanded="false">
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
  <span aria-hidden="true"></span>
</a>

<div class="navbar-menu" id="navMenu">
  <!-- navbar-start, navbar-end... -->
</div>

document.addEventListener('DOMContentLoaded', () => {

  // Get all "navbar-burger" elements
  const $navbarBurgers = Array.prototype.slice.call(document.querySelectorAll('.navbar-burger'), 0);

  // Add a click event on each of them
  $navbarBurgers.forEach( el => {
    el.addEventListener('click', () => {

      // Get the target from the "data-target" attribute
      const target = el.dataset.target;
      const $target = document.getElementById(target);

      // Toggle the "is-active" class on both the "navbar-burger" and the "navbar-menu"
      el.classList.toggle('is-active');
      $target.classList.toggle('is-active');

    });
  });

});

这里还有另一个实现示例，它同样对 navbar-burger 和目标 navbar-menu 同时切换 is-active 类，但这次使用的是 jQuery。

$(document).ready(function() {

  // Check for click events on the navbar burger icon
  $(".navbar-burger").click(function() {

      // Toggle the "is-active" class on both the "navbar-burger" and the "navbar-menu"
      $(".navbar-burger").toggleClass("is-active");
      $(".navbar-menu").toggleClass("is-active");

  });
});

请记住，这些只是实现示例。Bulma 包不包含任何 JavaScript。

navbar-start 和 navbar-end 是 navbar-menu 的两个直接且唯一的子元素。

在桌面 >= 1024px 上

navbar-start 将出现在左侧
navbar-end 将出现在右侧

它们每个都可以包含任意数量的 navbar-item。

<div class="navbar-menu">
  <div class="navbar-start">
    <!-- navbar items -->
  </div>

  <div class="navbar-end">
    <!-- navbar items -->
  </div>
</div>

navbar-item 是一个可重复的元素，可以是

导航链接
```
<a class="navbar-item">
  Home
</a>
```

品牌徽标的容器

<a class="navbar-item">
  <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M170 132.571V27.5908C170 25.5451 170.915 23.93 172.746 22.7456C174.576 21.5612 176.729 20.969 179.206 20.969H210.377C232.019 20.969 242.84 30.4441 242.84 49.3943C242.84 62.5303 238.264 71.0902 229.112 75.074C234.603 77.2275 238.748 80.2692 241.548 84.1992C244.347 88.1292 245.747 93.8627 245.747 101.4V104.791C245.747 116.743 242.84 125.437 237.026 130.875C231.211 136.312 223.351 139.031 213.445 139.031H179.206C176.514 139.031 174.307 138.385 172.584 137.093C170.861 135.801 170 134.293 170 132.571ZM190.834 120.619H209.085C219.529 120.619 224.751 114.751 224.751 103.015V100.431C224.751 94.401 223.432 90.0404 220.794 87.3486C218.156 84.6568 214.253 83.3109 209.085 83.3109H190.834V120.619ZM190.834 66.8371H208.923C213.122 66.8371 216.326 65.5989 218.533 63.1225C220.74 60.646 221.844 57.2544 221.844 52.9475C221.844 48.7483 220.686 45.4374 218.371 43.0148C216.057 40.5922 212.853 39.3809 208.762 39.3809H190.834V66.8371ZM260.283 103.015V27.4293C260.283 25.2759 261.306 23.6608 263.351 22.5841C265.397 21.5074 267.873 20.969 270.781 20.969C273.688 20.969 276.164 21.5074 278.21 22.5841C280.256 23.6608 281.279 25.2759 281.279 27.4293V103.015C281.279 115.397 287.2 121.588 299.044 121.588C310.888 121.588 316.81 115.397 316.81 103.015V27.4293C316.81 25.2759 317.833 23.6608 319.879 22.5841C321.925 21.5074 324.401 20.969 327.308 20.969C330.215 20.969 332.692 21.5074 334.738 22.5841C336.783 23.6608 337.806 25.2759 337.806 27.4293V103.015C337.806 115.72 334.28 125.061 327.227 131.036C320.175 137.012 310.781 140 299.044 140C287.308 140 277.914 137.039 270.861 131.117C263.809 125.195 260.283 115.828 260.283 103.015ZM356.703 132.409V27.4293C356.703 25.2759 357.725 23.6608 359.771 22.5841C361.817 21.5074 364.293 20.969 367.201 20.969C370.108 20.969 372.584 21.5074 374.63 22.5841C376.676 23.6608 377.699 25.2759 377.699 27.4293V120.619H417.106C419.044 120.619 420.579 121.534 421.709 123.365C422.84 125.195 423.405 127.349 423.405 129.825C423.405 132.301 422.84 134.455 421.709 136.285C420.579 138.116 419.044 139.031 417.106 139.031H365.908C363.432 139.031 361.279 138.439 359.448 137.254C357.618 136.07 356.703 134.455 356.703 132.409ZM434.872 132.409V31.467C434.872 27.9138 435.868 25.2759 437.86 23.5532C439.852 21.8304 442.355 20.969 445.37 20.969C449.354 20.969 452.423 21.6689 454.576 23.0686C456.729 24.4684 459.098 27.4832 461.682 32.1131L481.548 68.2907L501.413 32.1131C503.997 27.4832 506.393 24.4684 508.6 23.0686C510.808 21.6689 513.903 20.969 517.887 20.969C520.902 20.969 523.405 21.8304 525.397 23.5532C527.389 25.2759 528.385 27.9138 528.385 31.467V132.409C528.385 134.455 527.335 136.07 525.236 137.254C523.136 138.439 520.686 139.031 517.887 139.031C514.98 139.031 512.503 138.439 510.458 137.254C508.412 136.07 507.389 134.455 507.389 132.409V62.961L488.493 96.5545C486.985 99.354 484.616 100.754 481.386 100.754C478.264 100.754 475.949 99.354 474.441 96.5545L455.868 61.6689V132.409C455.868 134.455 454.818 136.07 452.719 137.254C450.619 138.439 448.17 139.031 445.37 139.031C442.463 139.031 439.987 138.439 437.941 137.254C435.895 136.07 434.872 134.455 434.872 132.409ZM539.529 130.31C539.529 130.094 539.637 129.556 539.852 128.694L571.023 27.1063C571.669 24.8452 573.257 23.0956 575.787 21.8573C578.318 20.6191 581.198 20 584.428 20C587.658 20 590.565 20.6191 593.149 21.8573C595.734 23.0956 597.349 24.8452 597.995 27.1063L629.166 128.694C629.381 129.556 629.489 130.094 629.489 130.31C629.489 132.678 628.035 134.724 625.128 136.447C622.221 138.17 619.26 139.031 616.245 139.031C612.261 139.031 609.892 137.631 609.139 134.832L603.001 113.351H566.016L559.879 134.832C559.125 137.631 556.756 139.031 552.773 139.031C549.65 139.031 546.662 138.197 543.809 136.528C540.956 134.859 539.529 132.786 539.529 130.31ZM570.377 96.8775H598.479L584.428 47.2948L570.377 96.8775Z" fill="black" class="bd-svg-black" />
  <path fill-rule="evenodd" clip-rule="evenodd" d="M0 110L10 40L50 0L100 50L70 80L110 120L50 160L0 110Z" fill="#00D1B2"/>
</svg>

</a>

下拉菜单的父级

<div class="navbar-item has-dropdown">
  <a class="navbar-link">
    Docs
  </a>

  <div class="navbar-dropdown">
    <!-- Other navbar items -->
  </div>
</div>

navbar 下拉菜单的子级

<div class="navbar-dropdown">
  <a class="navbar-item">
    Overview
  </a>
</div>

几乎任何你想要的东西的容器，比如 field

<div class="navbar-item">
  <div class="field is-grouped">
    <p class="control">
      <a class="button">
        <span class="icon">
          <i class="fas fa-twitter" aria-hidden="true"></i>
        </span>
        <span>Tweet</span>
      </a>
    </p>
    <p class="control">
      <a class="button is-primary">
        <span class="icon">
          <i class="fas fa-download" aria-hidden="true"></i>
        </span>
        <span>Download</span>
      </a>
    </p>
  </div>
</div>

它可以是锚点标签 <a> 或 <div>，作为以下内容的直接子级

navbar
navbar-brand
navbar-start
navbar-end
navbar-dropdown

您可以添加以下修饰符类

is-expanded 将其变成一个全宽元素
is-tab 在悬停时添加底部边框，并使用 is-active 显示底部边框

为了在任何视觉环境中无缝集成 navbar，您可以在 navbar 组件上添加 is-transparent 修饰符。这将从 navbar 项中删除任何悬停或活动背景。

示例

HTML

<nav class="navbar is-transparent">
  <div class="navbar-brand">
    <a class="navbar-item" href="https://bulma.org.cn">
      <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M170 132.571V27.5908C170 25.5451 170.915 23.93 172.746 22.7456C174.576 21.5612 176.729 20.969 179.206 20.969H210.377C232.019 20.969 242.84 30.4441 242.84 49.3943C242.84 62.5303 238.264 71.0902 229.112 75.074C234.603 77.2275 238.748 80.2692 241.548 84.1992C244.347 88.1292 245.747 93.8627 245.747 101.4V104.791C245.747 116.743 242.84 125.437 237.026 130.875C231.211 136.312 223.351 139.031 213.445 139.031H179.206C176.514 139.031 174.307 138.385 172.584 137.093C170.861 135.801 170 134.293 170 132.571ZM190.834 120.619H209.085C219.529 120.619 224.751 114.751 224.751 103.015V100.431C224.751 94.401 223.432 90.0404 220.794 87.3486C218.156 84.6568 214.253 83.3109 209.085 83.3109H190.834V120.619ZM190.834 66.8371H208.923C213.122 66.8371 216.326 65.5989 218.533 63.1225C220.74 60.646 221.844 57.2544 221.844 52.9475C221.844 48.7483 220.686 45.4374 218.371 43.0148C216.057 40.5922 212.853 39.3809 208.762 39.3809H190.834V66.8371ZM260.283 103.015V27.4293C260.283 25.2759 261.306 23.6608 263.351 22.5841C265.397 21.5074 267.873 20.969 270.781 20.969C273.688 20.969 276.164 21.5074 278.21 22.5841C280.256 23.6608 281.279 25.2759 281.279 27.4293V103.015C281.279 115.397 287.2 121.588 299.044 121.588C310.888 121.588 316.81 115.397 316.81 103.015V27.4293C316.81 25.2759 317.833 23.6608 319.879 22.5841C321.925 21.5074 324.401 20.969 327.308 20.969C330.215 20.969 332.692 21.5074 334.738 22.5841C336.783 23.6608 337.806 25.2759 337.806 27.4293V103.015C337.806 115.72 334.28 125.061 327.227 131.036C320.175 137.012 310.781 140 299.044 140C287.308 140 277.914 137.039 270.861 131.117C263.809 125.195 260.283 115.828 260.283 103.015ZM356.703 132.409V27.4293C356.703 25.2759 357.725 23.6608 359.771 22.5841C361.817 21.5074 364.293 20.969 367.201 20.969C370.108 20.969 372.584 21.5074 374.63 22.5841C376.676 23.6608 377.699 25.2759 377.699 27.4293V120.619H417.106C419.044 120.619 420.579 121.534 421.709 123.365C422.84 125.195 423.405 127.349 423.405 129.825C423.405 132.301 422.84 134.455 421.709 136.285C420.579 138.116 419.044 139.031 417.106 139.031H365.908C363.432 139.031 361.279 138.439 359.448 137.254C357.618 136.07 356.703 134.455 356.703 132.409ZM434.872 132.409V31.467C434.872 27.9138 435.868 25.2759 437.86 23.5532C439.852 21.8304 442.355 20.969 445.37 20.969C449.354 20.969 452.423 21.6689 454.576 23.0686C456.729 24.4684 459.098 27.4832 461.682 32.1131L481.548 68.2907L501.413 32.1131C503.997 27.4832 506.393 24.4684 508.6 23.0686C510.808 21.6689 513.903 20.969 517.887 20.969C520.902 20.969 523.405 21.8304 525.397 23.5532C527.389 25.2759 528.385 27.9138 528.385 31.467V132.409C528.385 134.455 527.335 136.07 525.236 137.254C523.136 138.439 520.686 139.031 517.887 139.031C514.98 139.031 512.503 138.439 510.458 137.254C508.412 136.07 507.389 134.455 507.389 132.409V62.961L488.493 96.5545C486.985 99.354 484.616 100.754 481.386 100.754C478.264 100.754 475.949 99.354 474.441 96.5545L455.868 61.6689V132.409C455.868 134.455 454.818 136.07 452.719 137.254C450.619 138.439 448.17 139.031 445.37 139.031C442.463 139.031 439.987 138.439 437.941 137.254C435.895 136.07 434.872 134.455 434.872 132.409ZM539.529 130.31C539.529 130.094 539.637 129.556 539.852 128.694L571.023 27.1063C571.669 24.8452 573.257 23.0956 575.787 21.8573C578.318 20.6191 581.198 20 584.428 20C587.658 20 590.565 20.6191 593.149 21.8573C595.734 23.0956 597.349 24.8452 597.995 27.1063L629.166 128.694C629.381 129.556 629.489 130.094 629.489 130.31C629.489 132.678 628.035 134.724 625.128 136.447C622.221 138.17 619.26 139.031 616.245 139.031C612.261 139.031 609.892 137.631 609.139 134.832L603.001 113.351H566.016L559.879 134.832C559.125 137.631 556.756 139.031 552.773 139.031C549.65 139.031 546.662 138.197 543.809 136.528C540.956 134.859 539.529 132.786 539.529 130.31ZM570.377 96.8775H598.479L584.428 47.2948L570.377 96.8775Z" fill="black" class="bd-svg-black" />
  <path fill-rule="evenodd" clip-rule="evenodd" d="M0 110L10 40L50 0L100 50L70 80L110 120L50 160L0 110Z" fill="#00D1B2"/>
</svg>

    </a>
    <div class="navbar-burger js-burger" data-target="navbarExampleTransparentExample">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
    </div>
  </div>

  <div id="navbarExampleTransparentExample" class="navbar-menu">
    <div class="navbar-start">
      <a class="navbar-item" href="https://bulma.org.cn/"> Home </a>
      <div class="navbar-item has-dropdown is-active">
        <a class="navbar-link" href="https://bulma.org.cn/documentation/overview/start/"> Docs </a>
        <div class="navbar-dropdown is-boxed">
          <a class="navbar-item" href="https://bulma.org.cn/documentation/overview/start/"> Overview </a>
          <a class="navbar-item" href="https://bulma.org.cn/documentation/overview/modifiers/"> Modifiers </a>
          <hr class="navbar-divider">
          <a class="navbar-item" href="https://bulma.org.cn/documentation/columns/basics/"> Columns </a>
          <a class="navbar-item is-selected" href="https://bulma.org.cn/documentation/layout/container/"> Layout </a>
          <a class="navbar-item" href="https://bulma.org.cn/documentation/form/general/"> Form </a>
          <a class="navbar-item" href="https://bulma.org.cn/documentation/elements/box/"> Elements </a>
          <a class="navbar-item" href="https://bulma.org.cn/documentation/components/breadcrumb/"> Components </a>
        </div>
      </div>
    </div>

    <div class="navbar-end">
      <div class="navbar-item">
        <div class="field is-grouped">
          <p class="control">
            <a
              class="bd-tw-button button"
              data-social-network="Twitter"
              data-social-action="tweet"
              data-social-target="https://bulma.org.cn"
              target="_blank"
              href="https://twitter.com/intent/tweet?text=Bulma: a modern CSS framework based on Flexbox&amp;hashtags=bulmaio&amp;url=https://bulma.org.cn&amp;via=jgthms"
            >
              <span class="icon">
                <i class="fab fa-twitter"></i>
              </span>
              <span> Tweet </span>
            </a>
          </p>
          <p class="control">
            <a class="button is-primary" href="https://github.com/jgthms/bulma/releases/download/1.0.0/bulma-1.0.0.zip">
              <span class="icon">
                <i class="fas fa-download"></i>
              </span>
              <span>Download</span>
            </a>
          </p>
        </div>
      </div>
    </div>
  </div>
</nav>

现在你可以将导航栏固定在页面的顶部或底部。这是一个两步的过程

将 is-fixed-top 或 is-fixed-bottom 添加到 navbar 组件
```
<nav class="navbar is-fixed-top">
```
将相应的 has-navbar-fixed-top 或 has-navbar-fixed-bottom 修饰符添加到 <html> 或 <body> 元素，以向页面提供适当的填充
```
<html class="has-navbar-fixed-top">
```

试试看！

显示底部导航栏

要创建一个下拉菜单，你需要4个元素

具有 has-dropdown 修饰符的 navbar-item
包含下拉箭头的 navbar-link
可以包含 navbar-item 和 navbar-divider 实例的 navbar-dropdown

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <div class="navbar-item has-dropdown">
    <a class="navbar-link">
      Docs
    </a>

    <div class="navbar-dropdown">
      <a class="navbar-item">
        Overview
      </a>
      <a class="navbar-item">
        Elements
      </a>
      <a class="navbar-item">
        Components
      </a>
      <hr class="navbar-divider">
      <div class="navbar-item">
        Version 1.0.0
      </div>
    </div>
  </div>
</nav>

使用CSS或JavaScript显示/隐藏下拉菜单

navbar-dropdown 在触摸设备 < 1024px 上可见，但在桌面 >= 1024px 上隐藏。下拉菜单在桌面上的显示方式取决于父类的样式。

具有 has-dropdown 修饰符的 navbar-item 有2个附加修饰符

is-hoverable：当悬停父 navbar-item 时，下拉菜单将显示
is-active：下拉菜单将始终显示

虽然 CSS :hover 实现效果很好，但 is-active 类可供希望通过 JavaScript 控制下拉菜单显示的用户使用。

<div class="navbar-item has-dropdown is-hoverable">
  <!-- navbar-link, navbar-dropdown etc. -->
</div>

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <div class="navbar-item has-dropdown is-hoverable">
    <a class="navbar-link">
      Docs
    </a>

    <div class="navbar-dropdown">
      <a class="navbar-item">
        Overview
      </a>
      <a class="navbar-item">
        Elements
      </a>
      <a class="navbar-item">
        Components
      </a>
      <hr class="navbar-divider">
      <div class="navbar-item">
        Version 1.0.0
      </div>
    </div>
  </div>
</nav>

<div class="navbar-item has-dropdown is-active">
  <!-- navbar-link, navbar-dropdown etc. -->
</div>

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <div class="navbar-item has-dropdown is-active">
    <a class="navbar-link">
      Docs
    </a>

    <div class="navbar-dropdown">
      <a class="navbar-item">
        Overview
      </a>
      <a class="navbar-item">
        Elements
      </a>
      <a class="navbar-item">
        Components
      </a>
      <hr class="navbar-divider">
      <div class="navbar-item">
        Version 1.0.0
      </div>
    </div>
  </div>
</nav>

右下拉菜单

如果父 navbar-item 位于右侧，则可以使用 is-right 修饰符将下拉菜单定位为从右侧开始。

<div class="navbar-dropdown is-right">
  <!-- navbar-item, navbar-divider etc. -->
</div>

文档

使用 Bulma 创建网站所需的一切

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <div class="navbar-menu">
    <div class="navbar-start">
      <div class="navbar-item has-dropdown is-active">
        <a class="navbar-link">
          Left
        </a>

        <div class="navbar-dropdown">
          <a class="navbar-item">
            Overview
          </a>
          <a class="navbar-item">
            Elements
          </a>
          <a class="navbar-item">
            Components
          </a>
          <hr class="navbar-divider">
          <div class="navbar-item">
            Version 1.0.0
          </div>
        </div>
      </div>
    </div>

    <div class="navbar-end">
      <div class="navbar-item has-dropdown is-active">
        <a class="navbar-link">
          Right
        </a>

        <div class="navbar-dropdown is-right">
          <a class="navbar-item">
            Overview
          </a>
          <a class="navbar-item">
            Elements
          </a>
          <a class="navbar-item">
            Components
          </a>
          <hr class="navbar-divider">
          <div class="navbar-item">
            Version 1.0.0
          </div>
        </div>
      </div>
    </div>
  </div>
</nav>

<section class="hero is-primary">
  <div class="hero-body">
    <p class="title">
      Documentation
    </p>
    <p class="subtitle">
      Everything you need to <strong>create a website</strong> with Bulma
    </p>
  </div>
</section>

上拉菜单

如果你在底部使用导航栏，如固定底部导航栏，则可能希望使用 上拉菜单。只需将 has-dropdown 和 has-dropdown-up 修饰符添加到父 navbar-item 即可。

<div class="navbar-item has-dropdown has-dropdown-up is-hoverable">
  <a class="navbar-link" href="https://bulma.org.cn/documentation/overview/start/">
    Docs
  </a>
  <div class="navbar-dropdown">
    <a class="navbar-item" href="https://bulma.org.cn/documentation/overview/start/">
      Overview
    </a>
  </div>
</div>

文档

使用 Bulma 创建网站所需的一切

<section class="hero is-primary">
  <div class="hero-body">
    <p class="title">
      Documentation
    </p>
    <p class="subtitle">
      Everything you need to <strong>create a website</strong> with Bulma
    </p>
  </div>
</section>

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <div class="navbar-menu">
    <div class="navbar-start">
      <div class="navbar-item has-dropdown has-dropdown-up is-active">
        <a class="navbar-link">
          Dropup
        </a>

        <div class="navbar-dropdown">
          <a class="navbar-item">
            Overview
          </a>
          <a class="navbar-item">
            Elements
          </a>
          <a class="navbar-item">
            Components
          </a>
          <hr class="navbar-divider">
          <div class="navbar-item">
            Version 1.0.0
          </div>
        </div>
      </div>
    </div>
  </div>
</nav>

无箭头下拉菜单

你可以通过向导航栏的项目添加 is-arrowless 修饰符来移除其中的箭头。

<div class="navbar-item has-dropdown is-hoverable">
  <a class="navbar-link is-arrowless">
    Docs
  </a>
  <!-- navbar-dropdowns -->
</div>

<div class="navbar-item has-dropdown is-hoverable">
  <a class="navbar-link is-arrowless">
    Link without arrow
  </a>
  <div class="navbar-dropdown">
    <a class="navbar-item">
      Overview
    </a>
    <a class="navbar-item">
      Elements
    </a>
    <a class="navbar-item">
      Components
    </a>
    <hr class="navbar-divider">
    <div class="navbar-item">
      Version 1.0.0
    </div>
  </div>
</div>

下拉菜单样式

默认情况下，navbar-dropdown 具有

灰色的 border-top
两个底部角的 border-radius

文档

使用 Bulma 创建网站所需的一切

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <a class="navbar-item">
    <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
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在使用透明导航栏时，最好使用下拉菜单的框装版本，方法是使用 is-boxed 修饰符。

灰色的边框被移除
添加了轻微的 内阴影
所有角都圆角
悬停/活动状态动画

文档

使用 Bulma 创建网站所需的一切

<nav class="navbar is-transparent" role="navigation" aria-label="dropdown navigation">
  <a class="navbar-item">
    <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
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  <path fill-rule="evenodd" clip-rule="evenodd" d="M0 110L10 40L50 0L100 50L70 80L110 120L50 160L0 110Z" fill="#00D1B2"/>
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活动下拉导航栏项目

文档

使用 Bulma 创建网站所需的一切

<nav class="navbar" role="navigation" aria-label="dropdown navigation">
  <a class="navbar-item">
    <svg width="640" height="160" viewBox="0 0 640 160" fill="none" xmlns="http://www.w3.org/2000/svg">
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  <path fill-rule="evenodd" clip-rule="evenodd" d="M0 110L10 40L50 0L100 50L70 80L110 120L50 160L0 110Z" fill="#00D1B2"/>
</svg>

  </a>

  <div class="navbar-item has-dropdown is-active">
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      Docs
    </a>

    <div class="navbar-dropdown">
      <a class="navbar-item">
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      <a class="navbar-item is-selected">
        Elements
      </a>
      <a class="navbar-item">
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      </a>
      <hr class="navbar-divider">
      <div class="navbar-item">
        Version 1.0.0
      </div>
    </div>
  </div>
</nav>

<section class="hero is-primary">
  <div class="hero-body">
    <p class="title">
      Documentation
    </p>
    <p class="subtitle">
      Everything you need to <strong>create a website</strong> with Bulma
    </p>
  </div>
</section>

下拉分隔符

你可以添加 navbar-divider 在 navbar-dropdown 中显示 水平线。

<hr class="navbar-divider">

颜色 #

你可以使用 9 个颜色修饰符之一更改 navbar 的背景颜色：

is-primary
is-link
is-info
is-success
is-warning
is-danger
is-black
is-dark
is-light
is-white

<nav class="navbar is-primary">
  <!-- navbar brand, navbar menu... -->
</nav>

类型	名称	描述
间距	`is-spaced`	设置顶部和底部填充为 1rem，左侧和右侧填充为 2rem
阴影	`has-shadow`	在导航栏周围添加少量 box-shadow

Sass 和 CSS 变量 #

Sass 变量	CSS 变量	值
`$navbar-background-color`	`var(--bulma-)`	`var(--bulma-scheme-main)`
`$navbar-box-shadow-size`	`var(--bulma-)`	`0 0.125em 0 0`
`$navbar-box-shadow-color`	`var(--bulma-)`	`var(--bulma-background)`
`$navbar-height`	`var(--bulma-navbar-height)`	`3.25rem`
`$navbar-padding-vertical`	`var(--bulma-)`	`1rem`
`$navbar-padding-horizontal`	`var(--bulma-)`	`2rem`
`$navbar-z`	`var(--bulma-)`	`30`
`$navbar-fixed-z`	`var(--bulma-)`	`30`
`$navbar-item-img-max-height`	`var(--bulma-)`	`1.75rem`
`$navbar-burger-color`	`var(--bulma-)`	`var(--bulma-navbar-item-color)`
`$navbar-tab-hover-background-color`	`var(--bulma-)`	`transparent`
`$navbar-tab-hover-border-bottom-color`	`var(--bulma-)`	`var(--bulma-link)`
`$navbar-tab-active-color`	`var(--bulma-)`	`var(--bulma-link)`
`$navbar-tab-active-background-color`	`var(--bulma-)`	`transparent`
`$navbar-tab-active-border-bottom-color`	`var(--bulma-)`	`var(--bulma-link)`
`$navbar-tab-active-border-bottom-style`	`var(--bulma-)`	`solid`
`$navbar-tab-active-border-bottom-width`	`var(--bulma-)`	`0.1875em`
`$navbar-dropdown-background-color`	`var(--bulma-)`	`var(--bulma-scheme-main)`
`$navbar-dropdown-border-l`	`var(--bulma-)`	`var(--bulma-border-l)`
`$navbar-dropdown-border-color`	`var(--bulma-)`	`hsl( var(--bulma-navbar-h), var(--bulma-navbar-s), var(--bulma-navbar-dropdown-border-l) )`
`$navbar-dropdown-border-style`	`var(--bulma-)`	`solid`
`$navbar-dropdown-border-width`	`var(--bulma-)`	`0.125em`
`$navbar-dropdown-offset`	`var(--bulma-)`	`-0.25em`
`$navbar-dropdown-arrow`	`var(--bulma-)`	`var(--bulma-link)`
`$navbar-dropdown-radius`	`var(--bulma-)`	`var(--bulma-radius-large)`
`$navbar-dropdown-z`	`var(--bulma-)`	`20`
`$navbar-dropdown-boxed-radius`	`var(--bulma-)`	`var(--bulma-radius-large)`
`$navbar-dropdown-boxed-shadow`	`var(--bulma-)`	`0 0.5em 0.5em hsla( var(--bulma-scheme-h), var(--bulma-scheme-s), var(--bulma-scheme-invert-l), 0.1 ), 0 0 0 1px hsla( var(--bulma-scheme-h), var(--bulma-scheme-s), var(--bulma-scheme-invert-l), 0.1 )`
`$navbar-divider-background-l`	`var(--bulma-)`	`var(--bulma-background-l)`
`$navbar-divider-height`	`var(--bulma-)`	`0.125em`
`$navbar-bottom-box-shadow-size`	`var(--bulma-)`	`0 -0.125em 0 0`
`$navbar-breakpoint`	`var(--bulma-)`	`iv.$desktop`

从这里开始

特性

Sass 工具

自定义

CSS 库

CSS 帮助器

赞助商

导航栏

一个响应式水平导航栏，可支持图像、链接、按钮和下拉菜单

基本导航栏 #

导航栏品牌 #

导航栏汉堡包 #

导航栏菜单 #

Javascript 切换

Navbar start 和 navbar end #

Navbar item #

透明 navbar #

固定导航栏 #

试试看！

使用CSS或JavaScript显示/隐藏下拉菜单

右下拉菜单

上拉菜单

无箭头下拉菜单

下拉菜单样式

活动下拉导航栏项目

下拉分隔符

颜色 #

导航栏辅助类 #

Sass 和 CSS 变量 #

如何支持 Bulma

从这里开始

特性

Sass 工具

自定义

CSS 库

CSS 帮助器

赞助商

导航栏

一个响应式水平导航栏，可支持图像、链接、按钮和下拉菜单

基本导航栏 #

导航栏品牌 #

导航栏汉堡包 #

导航栏菜单 #

Javascript 切换

Navbar start 和 navbar end #

Navbar item #

透明 navbar #

固定导航栏 #

试试看！

下拉菜单 #

使用CSS或JavaScript显示/隐藏下拉菜单

右下拉菜单

上拉菜单

无箭头下拉菜单

下拉菜单样式

活动下拉导航栏项目

下拉分隔符

颜色 #

导航栏辅助类 #

Sass 和 CSS 变量 #

如何支持 Bulma