CSS实现菜单按钮动画

    //vue 中通过点击事件改变class    <div         class="burger"         style="float: right;"        :class="{'transform':rightTopBtn}"        @click.stop="rightTopBtn=!rightTopBtn"    >        <div></div>        <div></div>        <div></div>    </div>

  <!--按钮容器 START-->    .burger {        cursor: pointer;        display: inline-block;        margin: 7px 6px 0 0;        outline: none;    }    <!--按钮容器 END-->    <!--三条横线 通过rotate3d实现旋转 START-->    .burger div {        width: 30px;        height: 4px;        margin-bottom: 6px;        background-color: rgb(51, 51, 51);        transform: rotate3d(0, 0, 0, 0);    }    <!--三条横线 END-->    .burger.transform div {        background-color: transparent;    }    .burger.transform div:first-of-type {        top: 10px;        transform: rotate3d(0, 0, 1, 45deg)    }    .burger.transform div:last-of-type {        bottom: 10px;        transform: rotate3d(0, 0, 1, -45deg)    }    <!--点击后第一个和第三个横线的效果 START-->    .burger.transform div:first-of-type, .burger.transform div:last-of-type {        transition: transform .4s .3s ease, background-color 250ms ease-in;        background: #00c1de;    }    <!--点击后第一个和第三个横线的效果 END-->    <!--取消点击后恢复动画 START-->    .burger div:first-of-type, .burger div:last-of-type {        transition: transform .3s ease .0s, background-color 0ms ease-out;        position: relative;    }    <!--取消点击后恢复动画 END-->