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源代码下载
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代码解读
定义 dom,容器代表卡车,包含的 2 个子元素代表车头和尾气;<hr>
代表道路:
居中显示,同时道路与页面之间留出空间:
body { margin: 10%; padding-top: 10%;}
画出卡车车厢:
.truck { width: 15em; height: 5em; font-size: 10px; background-color: #444; border-radius: 0.4em;}
用伪元素画出车厢的车轮:
.truck { position: relative;}.truck::before,.truck::after { content: ''; position: absolute; box-sizing: border-box; width: 2em; height: 2em; background-color: #444; border: 0.1em solid white; border-radius: 50%; bottom: -1em;}.truck::before { left: 0.6em;}.truck::after { right: 0.6em;}
画出车头:
.cab { position: absolute; width: 3.3em; height: 2.5em; background-color: #333; left: -3.5em; bottom: 0; border-radius: 40% 0 0.4em 0.4em;}.cab::before { content: ''; position: absolute; width: 2em; height: 1.5em; background-color: #333; top: -1.5em; right: 0; border-radius: 100% 0 0 0;}
画出车头的车轮:
.cab::after { content: ''; position: absolute; box-sizing: border-box; width: 2em; height: 2em; background-color: #444; border: 0.1em solid white; border-radius: 50%; bottom: -1em; left: 0.5em;}
画出尾气的初始状态:
.smoke,.smoke::before,.smoke::after { content: ''; position: absolute; width: 1em; height: 1em; background-color: #333; right: -0.1em; bottom: -0.5em; border-radius: 50%;}
增加排出尾气的动画:
.smoke { animation: smoke-1 2s infinite;}.smoke::before { animation: smoke-2 2s infinite;}.smoke::after { animation: smoke-3 2s infinite;}@keyframes smoke-1 { to { width: 3em; height: 3em; right: -3em; bottom: 0.5em; }}@keyframes smoke-2 { to { width: 2.5em; height: 2.5em; right: -6em; bottom: 0.8em; }}@keyframes smoke-3 { to { width: 3.5em; height: 3.5em; right: -4em; bottom: 0.2em; }}
增加尾气的飘散效果:
.smoke { animation: drift 2s infinite, smoke-1 2s infinite;}.smoke::before { animation: drift 3s infinite, smoke-2 3s infinite;}.smoke::after { animation: drift 4s infinite, smoke-3 4s infinite;}@keyframes drift { 0%, 100% { filter: opacity(0); } 15% { filter: opacity(0.9); }}
增加卡车行驶的动画效果:
.truck { animation: move 5s infinite;}@keyframes move { 0% { margin-left: 90%; } 50% { margin-left: 45%; } 100% { margin-left: 0; } 0%, 100% { filter: opacity(0); } 10%, 90% { filter: opacity(1); }}
增加卡片行驶中颠簸的动画效果:
.truck { animation: put-put 2s infinite, move 10s infinite;}@keyframes put-put { 0% { margin-top: 0; height: 5em; } 5% { margin-top: -0.2em; height: 5.2em; } 20% { margin-top: -0.1em; height: 5em; } 35% { margin-top: 0.1em; height: 4.9em; } 40% { margin-top: -0.1em; height: 5.1em; } 60% { margin-top: 0.1em; height: 4.9em; } 75% { margin-top: 0; height: 5em; } 80% { margin-top: -0.4em; height: 5.2em; } 100% { margin-top: 0.1em; height: 4.9em; }}
大功告成!