效果预览
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https://codepen.io/zhang-ou/pen/xjXxoz
可交互视频教程
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源代码下载
请从 github 下载。
https://github.com/comehope/front-end-daily-challenges/tree/master/013-hot-coffee-cup
代码解读
定义 dom,一个名为 coffee 的容器,其中包含一个名为 cup 的元素:
<div class="coffee">
<div class="cup"></div>
</div>
居中显示:
html, body {
height: 100%;
align-items: center;
justify-content: center;
background-color: brown;
}
画出杯子主体:
.coffee .cup {
width: 10em;
height: 9em;
background-color: white;
border-bottom-left-radius: 1.5em;
border-bottom-right-radius: 1.5em;
}
用伪元素画出杯口:
.coffee .cup {
position: relative;
}
.coffee .cup::before {
content: '';
position: absolute;
width: 100%;
height: 2em;
background-color: chocolate;
border: 0.5em solid white;
box-sizing: border-box;
border-radius: 50%;
top: -1em;
box-shadow: inset 0 0 1em rgba(0, 0, 0, 0.5);
}
用伪元素画出杯子把手:
.coffee .cup::after {
content: '';
position: absolute;
width: 3em;
height: 3.5em;
border: 0.8em solid white;
border-radius: 50%;
top: 20%;
left: 80%;
}
dom 元素增加托盘:
<div class="coffee">
<div class="cup"></div>
<div class="plate"></div>
</div>
画出托盘:
.coffee {
display: flex;
flex-direction: column;
align-items: center;
height: calc(9em + 1em);
position: relative;
}
.coffee .plate {
width: 16em;
height: 1em;
background-color: white;
border-bottom-left-radius: 50%;
border-bottom-right-radius: 50%;
position: absolute;
bottom: -1px;
}
dom 元素增加杯中冒出的热气:
<div class="coffee">
<div class="vapor">
<span></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
<div class="cup"></div>
<div class="plate"></div>
</div>
画出杯中冒出的热气:
.coffee {
height: calc(9em + 1em + 2em);
}
.coffee .vapor {
width: 7em;
display: flex;
justify-content: space-between;
}
.coffee .vapor span {
width: 0.1em;
min-width: 1px;
height: 2em;
background-color: white;
}
定义热气冒出的动画:
.coffee .vapor span {
animation: evaporation 2s linear infinite;
filter: opacity(0);
}
@keyframes evaporation {
from {
transform: translateY(0);
filter: opacity(1) blur(0.2em);
}
to {
transform: translateY(-4em);
filter: opacity(0) blur(0.4em);
}
}
最后,调整每条热气的延迟时间,使动感更强:
.coffee .vapor span:nth-child(1) {
animation-delay: 0.5s;
}
.coffee .vapor span:nth-child(2) {
animation-delay: 0.1s;
}
.coffee .vapor span:nth-child(3) {
animation-delay: 0.3s;
}
.coffee .vapor span:nth-child(4) {
animation-delay: 0.4s;
}
.coffee .vapor span:nth-child(5) {
animation-delay: 0.2s;
}
大功告成!
知识点
- border-bottom-left-radius https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-left-radius
- border-bottom-right-radius https://developer.mozilla.org/en-US/docs/Web/CSS/border-bottom-right-radius
- box-shadow https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow
- calc() https://developer.mozilla.org/en-US/docs/Web/CSS/calc
- translateY() https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/translateY
- filter https://developer.mozilla.org/en-US/docs/Web/CSS/filter
- animation-delay https://developer.mozilla.org/en-US/docs/Web/CSS/animation-delay
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