html5+css3弹性展开动画的导航菜单

1、新建html文档。

2、书写hmtl代码。

<nav class="nav">  <input type="checkbox" class="nav__cb" id="menu-cb">  <div class="nav__content">    <ul class="nav__items">      <li class="nav__item"> <span class="nav__item-text"> Home </span> </li>      <li class="nav__item"> <span class="nav__item-text"> Works </span> </li>      <li class="nav__item"> <span class="nav__item-text"> About </span> </li>      <li class="nav__item"> <span class="nav__item-text"> Contact </span> </li>    </ul>  </div>  <label class="nav__btn" for="menu-cb"></label></nav>

3、初始化css代码。<style>*, *:before, *:after { box-sizing: border-box; margin: 0; padding: 0; }html, body { height: 100%; }body:before, body:after { content: ""; display: block; height: 50%; background: #00bdea; }body:after { background: #208FF9; }</style>

4、书写css代码。.nav { overflow: hidden; position: absolute; left: 50%; top: 50%; width: auto; height: 90px; margin-top: -45px; background: #fff; border-radius: 5px; -webkit-transform: translate3d(-50%, 0, 0); transform: translate3d(-50%, 0, 0); box-shadow: 0 10px 35px rgba(0, 0, 0, 0.2); }.nav__cb { z-index: -1000; position: absolute; left: 0; top: 0; opacity: 0; pointer-events: none; }.nav__content { position: relative; width: 90px; height: 100%; -webkit-transition: width 1s cubic-bezier(0.49, -0.3, 0.68, 1.23); transition: width 1s cubic-bezier(0.49, -0.3, 0.68, 1.23); }.nav__cb:checked ~ .nav__content { -webkit-transition: width 1s cubic-bezier(0.48, 0.43, 0.29, 1.3); transition: width 1s cubic-bezier(0.48, 0.43, 0.29, 1.3); width: 410px; }.nav__items { position: relative; width: 410px; height: 100%; padding-left: 20px; padding-right: 110px; list-style-type: none; font-size: 0; }.nav__item { display: inline-block; vertical-align: top; width: 70px; text-align: center; color: #6C7784; font-size: 14px; line-height: 90px; font-family: Helvetica, Arial, sans-serif; font-weight: bold; -webkit-perspective: 1000px; perspective: 1000px; -webkit-transition: color 0.3s; transition: color 0.3s; cursor: pointer; }.nav__item:hover { color: #00bdea; }.nav__item-text { display: block; height: 100%; -webkit-transform: rotateY(-70deg); transform: rotateY(-70deg); opacity: 0; -webkit-transition: opacity 0.7s, -webkit-transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5); transition: opacity 0.7s, -webkit-transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5); transition: transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5), opacity 0.7s; transition: transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5), opacity 0.7s, -webkit-transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5); }.nav__cb:checked ~ .nav__content .nav__item-text { -webkit-transform: rotateY(0); transform: rotateY(0); opacity: 1; -webkit-transition: opacity 0.2s, -webkit-transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5); transition: opacity 0.2s, -webkit-transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5); transition: transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5), opacity 0.2s; transition: transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5), opacity 0.2s, -webkit-transform 0.7s cubic-bezier(0.48, 0.43, 0.7, 2.5); }.nav__item:nth-child(1) .nav__item-text { -webkit-transition-delay: 0.3s; transition-delay: 0.3s; }.nav__cb:checked ~ .nav__content .nav__item:nth-child(1) .nav__item-text { -webkit-transition-delay: 0s; transition-delay: 0s; }.nav__item:nth-child(2) .nav__item-text { -webkit-transition-delay: 0.2s; transition-delay: 0.2s; }.nav__cb:checked ~ .nav__content .nav__item:nth-child(2) .nav__item-text { -webkit-transition-delay: 0.1s; transition-delay: 0.1s; }.nav__item:nth-child(3) .nav__item-text { -webkit-transition-delay: 0.1s; transition-delay: 0.1s; }.nav__cb:checked ~ .nav__content .nav__item:nth-child(3) .nav__item-text { -webkit-transition-delay: 0.2s; transition-delay: 0.2s; }.nav__item:nth-child(4) .nav__item-text { -webkit-transition-delay: 0s; transition-delay: 0s; }.nav__cb:checked ~ .nav__content .nav__item:nth-child(4) .nav__item-text { -webkit-transition-delay: 0.3s; transition-delay: 0.3s; }.nav__btn { position: absolute; right: 0; top: 0; width: 90px; height: 90px; padding: 36px 31px; cursor: pointer; }.nav__btn:before, .nav__btn:after { content: ""; display: block; width: 28px; height: 4px; border-radius: 2px; background: #096DD3; -webkit-transform-origin: 50% 50%; transform-origin: 50% 50%; -webkit-transition: background-color 0.3s, -webkit-transform 1s cubic-bezier(0.48, 0.43, 0.29, 1.3); transition: background-color 0.3s, -webkit-transform 1s cubic-bezier(0.48, 0.43, 0.29, 1.3); transition: transform 1s cubic-bezier(0.48, 0.43, 0.29, 1.3), background-color 0.3s; transition: transform 1s cubic-bezier(0.48, 0.43, 0.29, 1.3), background-color 0.3s, -webkit-transform 1s cubic-bezier(0.48, 0.43, 0.29, 1.3); }.nav__btn:before { margin-bottom: 10px; }.nav__btn:hover:before, .nav__btn:hover:after { background: #00bdea; }.nav__cb:checked ~ .nav__btn:before { -webkit-transform: translateY(7px) rotate(-225deg); transform: translateY(7px) rotate(-225deg); }.nav__cb:checked ~ .nav__btn:after { -webkit-transform: translateY(-7px) rotate(225deg); transform: translateY(-7px) rotate(225deg); }

5、代码整体结构。

6、查看效果。