https://github.com/comehope/front-end-daily-challenges
定义 dom,容器中包含 2 个子元素,分别代表 1 个女生和一群男生(4个),每个 span
元素代表 1 个人(1 个方块):
<figure class="container"> <span class="girl"></span> <p class="boys"> <span></span> <span></span> <span></span> <span></span> </p> </figure>
居中显示:
body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; }
定义容器尺寸和它的子元素布局:
.container { width: 8em; height: 1em; font-size: 35px; display: flex; justify-content: space-between; }画出 5 个方块,用边框作为辅助线帮助定位:
.container span { width: 1em; height: 1em; border: 1px dashed black; /* 辅助线 */ } .boys { width: 6em; display: flex; justify-content: space-between; }用伪元素设置元素的样式,使它们变得柔和一些,为男生和男生填上不同的颜色,同时删掉上一步的辅助线:
.container span::before { content: ''; position: absolute; width: inherit; height: inherit; border-radius: 15%; box-shadow: 0 0 0.2em rgba(0, 0, 0, 0.3); } .girl::before { background-color: hotpink; } .boys span::before { background-color: dodgerblue; }使 4 个男生色块的颜色逐渐变淡,增加一点层次感:
.boys span:nth-child(1)::before { filter: brightness(1); } .boys span:nth-child(2)::before { filter: brightness(1.15); } .boys span:nth-child(3)::before { filter: brightness(1.3); } .boys span:nth-child(4)::before { filter: brightness(1.45); }接下来制作动画效果。
先增加女生移动的效果,同时颜色也做渐淡处理,后面其他动画的时间要保持一致,所以把动画时长设置为变量:
.container span { width: 1em; height: 1em; --duration: 3s; } .girl { animation: slide var(--duration) ease-in-out infinite; } @keyframes slide { from { transform: translateX(0); filter: brightness(1); } to { transform: translatex(calc(8em - (1em * 1.25))); filter: brightness(1.45); } }然后增加第 1 个男生跳开的动画效果,注意从 15% 到 35% 旋转的原点是在元素的正上方:
.boys span { animation: var(--duration) ease-in-out infinite; } .boys span:nth-child(1) { animation-name: jump-off-1; } @keyframes jump-off-1 { 0%, 15% { transform: rotate(0deg); } 35%, 100% { transform-origin: -50% center; transform: rotate(-180deg); } }参考第 1 个男生的动画效果,再增加另外 3 个男生跳开的动画效果,区别只是调整了关键帧的时间,依次后延 15% 的时间:
.boys span:nth-child(2) { animation-name: jump-off-2; } .boys span:nth-child(3) { animation-name: jump-off-3; } .boys span:nth-child(4) { animation-name: jump-off-4; } @keyframes jump-off-2 { 0%, 30% { transform: rotate(0deg); } 50%, 100% { transform-origin: -50% center; transform: rotate(-180deg); } } @keyframes jump-off-3 { 0%, 45% { transform: rotate(0deg); } 65%, 100% { transform-origin: -50% center; transform: rotate(-180deg); } } @keyframes jump-off-4 { 0%, 60% { transform: rotate(0deg); } 80%, 100% { transform-origin: -50% center; transform: rotate(-180deg); } }为第 1 个男生增加拟人的动画效果,这个效果写在
::before
伪元素中,动画的过程是从正常到压扁、然后抻长、再压扁、最后恢复正常,注意从 25% 到 40% 的压扁变形,因为此时主元素已经翻个儿,所以transform-origin
的原点和 从 5% 到 15% 的压扁变形的原点不一样:.boys span::before { animation: var(--duration) ease-in-out infinite; } .boys span:nth-child(1)::before { filter: brightness(1); animation-name: jump-down-1; } @keyframes jump-down-1 { 5% { transform: scale(1, 1); } 15% { transform-origin: center bottom; transform: scale(1.3, 0.7); } 20%, 25% { transform-origin: center bottom; transform: scale(0.8, 1.4); } 40% { transform-origin: center top; transform: scale(1.3, 0.7); } 55%, 100% { transform: scale(1, 1); } }参考第 1 个男生
::before
伪元素的动画效果,再增加另外 3 个男生拟人的动画效果,区别只是调整了关键帧的时间,依次后延 15% 的时间:.boys span:nth-child(2)::before { animation-name: jump-down-2; } .boys span:nth-child(3)::before { animation-name: jump-down-3; } .boys span:nth-child(4)::before { animation-name: jump-down-4; } @keyframes jump-down-2 { 20% { transform: scale(1, 1); } 30% { transform-origin: center bottom; transform: scale(1.3, 0.7); } 35%, 40% { transform-origin: center bottom; transform: scale(0.8, 1.4); } 55% { transform-origin: center top; transform: scale(1.3, 0.7); } 70%, 100% { transform: scale(1, 1); } } @keyframes jump-down-3 { 35% { transform: scale(1, 1); } 45% { transform-origin: center bottom; transform: scale(1.3, 0.7); } 50%, 55% { transform-origin: center bottom; transform: scale(0.8, 1.4); } 70% { transform-origin: center top; transform: scale(1.3, 0.7); } 85%, 100% { transform: scale(1, 1); } } @keyframes jump-down-4 { 50% { transform: scale(1, 1); } 60% { transform-origin: center bottom; transform: scale(1.3, 0.7); } 65%, 70% { transform-origin: center bottom; transform: scale(0.8, 1.4); } 85% { transform-origin: center top; transform: scale(1.3, 0.7); } 100%, 100% { transform: scale(1, 1); } }至此,女生从左侧移动到右侧的动画效果已经完成。
把所有动画属性都加上alternate
参数,使所有动画都往复执行,就实现了从右侧再回到左侧的效果:.girl { animation: slide var(--duration) ease-in-out infinite alternate; } .boys span { animation: var(--duration) ease-in-out infinite alternate; } .boys span::before { animation: var(--duration) ease-in-out infinite alternate; }大功告成!
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