效果预览按下右侧的“点击预览”按钮可以在当前页面预览，点击链接可以全屏预览。https://codepen.io/comehope/pen/KGveaN可交互视频此视频是可以交互的，你可以随时暂停视频，编辑视频中的代码。请用 chrome, safari, edge 打开观看。https://scrimba.com/p/pEgDAM/cgdaPsr源代码下载每日前端实战系列的全部源代码请从 github 下载：https://github.com/comehope/front-end-daily-challenges代码解读定义 dom，容器中有 2 个子元素，.envelope 代表伞盖，.basket 代表吊篮：<figure class=“balloon”> <div class=“envelope”> <span></span> <span></span> </div> <div class=“basket”> <span></span> <span></span> <span></span> <span></span> </div></figure>居中显示：body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(deepskyblue, skyblue, lightblue 20%);}定义容器的尺寸，子元素 .envelope 和 .basket 纵向居中布局：.balloon { width: 12em; height: 19em; font-size: 16px; display: flex; flex-direction: column; align-items: center;}先画伞盖。定义伞盖的尺寸：.envelope { position: relative; width: inherit; height: 16em;}伞盖的形状是上端为球形，下端为圆锥形，在二维平面中，圆锥在平面的投影为等腰三角形，所以我们先在上部画一个圆，再在下部画一个三角形。先画上部的圆：.envelope span { position: absolute; width: inherit; height: 12em; border-radius: 50%; color: orange; background-color: currentColor;}再用伪元素画出下部的等腰三角形：.envelope span::before { content: ‘’; position: absolute; width: 0; height: 0; border-width: 10em 5.5em 0 5.5em; border-style: solid; border-color: currentColor transparent transparent transparent; left: calc(50% - 5.5em); top: 8.45em;}.envelope 下共有 2 个 <span> 元素，让第 2 个 <span> 变形、变色，使伞盖形成竖条纹的花纹：.envelope span:nth-child(2) { transform: scaleX(0.4); filter: brightness(0.85) contrast(1.4);}隐藏 .envelope 容器外的部分，削掉三角形最下面的尖角：.envelope { overflow: hidden;}至此，伞盖完成，接下来画吊篮。定义吊篮的尺寸：.basket { position: relative; width: 2em; height: 3em;}用 ::before 伪元素画出篮子：.basket::before { content: ‘’; position: absolute; width: inherit; height: 1.6em; background-color: peru; bottom: 0; border-radius: 0 0 0.5em 0.5em;}用 ::after 伪元素画出篮子的顶边：.basket::after { content: ‘’; position: absolute; width: 105%; height: 0.3em; background-color: saddlebrown; left: calc((100% - 105%) / 2); top: 1.3em; border-radius: 0.3em;}.basket 下共有 4 个 <span> 元素，代表 4 根缆绳，设置它们的样式为竖细线：.basket span { position: absolute; width: 0.1em; height: 1.5em; background-color: burlywood;}定位缆绳，并倾斜不同的角度：.basket span { left: calc((var(–n) - 1) * 0.6em); transform-origin: bottom; transform: rotate(calc(var(–r) * 7deg));}.basket span:nth-child(1) { –n: 1; –r: -2; }.basket span:nth-child(2) { –n: 2; –r: -1; }.basket span:nth-child(3) { –n: 3; –r: 1; }.basket span:nth-child(4) { –n: 4; –r: 2; }最后，增加热气球微微浮动的动画效果：.balloon { animation: drift 2s infinite alternate;}@keyframes drift { to { transform: translateY(-5%); }}大功告成！