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https://codepen.io/comehope/pen/RBjdzZ
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代码解读
定义 dom，容器中包含 2 个元素，分别代表插头和线缆：
居中显示：
body {
margin: 0;
height: 100vh;
display: flex;
align-items: center;
}定义容器尺寸：
.cable {
display: flex;
align-items: center;
font-size: 10px;
margin-left: 5em;
}画出插头的轮廓：
.head {
width: 8.5em;
height: 8.5em;
border-radius: 2em 0 0 2em;
}画出插头上针脚的轮廓：
.head {
position: relative;
}
.head::before {
content: '';
position: absolute;
width: 3em;
height: 7.3em;
top: calc((8.5em - 7.3em) / 2);
left: 0.7em;
border-radius: 1em;
box-sizing: border-box;
}画出线缆中手持部位的轮廓：
.body {
width: 15.5em;
height: 11em;
border-radius: 0.5em;
}画出线缆中稍粗部位的轮廓：
.body {
position: relative;
display: flex;
align-items: center;
}
.body::before {
content: '';
position: absolute;
width: 13.5em;
height: 6em;
left: 15.5em;
}画出线缆的延长线部分：
.body::after {
content: '';
position: absolute;
width: 100vh;
height: 3.9em;
left: calc(15.5em + 13.5em);
}隐藏画面外的部分：
body {
overflow: hidden;
}接下来绘制细节。
为延长线涂上渐变色：
.body::after {
background:
linear-gradient(
white,
hsl(0, 0%, 96%) 5%,
hsl(0, 0%, 97%) 25%,
hsl(0, 0%, 95%) 40%,
hsl(0, 0%, 81%) 95%,
white
);
}为线缆中稍粗部位涂上渐变色：
.body::before {
background:
linear-gradient(
white,
hsl(0, 0%, 96%) 5%,
hsl(0, 0%, 98%) 20%,
hsl(0, 0%, 95%) 50%,
hsl(0, 0%, 81%) 95%,
white
);
}为线缆中手持部位涂上渐变色：
.body {
background:linear-gradient(
hsl(0, 0%, 91%),
white 15%,
hsl(0, 0%, 93%) 50%,
hsl(0, 0%, 87%) 70%,
hsl(0, 0%, 79%) 90%,
hsl(0, 0%, 84%),
hsl(0, 0%, 86%)
);
}为插头涂上渐变色：
.head {
background:
linear-gradient(
-45deg,
hsl(0, 0%, 75%),
hsl(0, 0%, 79%),
hsl(0, 0%, 78%),
hsl(0, 0%, 87%) 80%
);
}在插头上画出针脚：
.head::before {
background-color: white;
}
.head::after {
content: '';
position: absolute;
box-sizing: border-box;
width: 2.2em;
height: 0.4em;
color: goldenrod;
background-color: currentColor;
border-radius: 0.5em;
left: 1.1em;
top: 1.2em;
box-shadow:
0 0.8em 0,
0 1.6em 0,
0 2.4em 0,
0 3.2em 0,
0 4em 0,
0 4.8em 0,
0 5.6em 0;
}接下来添加阴影，使线缆更立体。
绘制插头上的阴影：
.head {
background:
linear-gradient(
90deg,
transparent 80%,
rgba(0,0,0,12%)
),
linear-gradient(
-45deg,
hsl(0, 0%, 75%),
hsl(0, 0%, 79%),
hsl(0, 0%, 78%),
hsl(0, 0%, 87%) 80%
);
}绘制线缆手持部分的阴影：
.body::before {
background:
linear-gradient(
45deg,
rgba(0,0,0,4%) 10%,
transparent 20%
),
linear-gradient(
90deg,
rgba(0,0,0,4%),
transparent 10%
),
linear-gradient(
white,
hsl(0, 0%, 96%) 5%,
hsl(0, 0%, 98%) 20%,
hsl(0, 0%, 95%) 50%,
hsl(0, 0%, 81%) 95%,
white
);
}绘制线缆中稍粗部位的阴影：
.body::after {
background:
linear-gradient(
45deg,
rgba(0,0,0,4%),
transparent 4%
),
linear-gradient(
90deg,
rgba(0,0,0,4%),
transparent 2%
),
linear-gradient(
white,
hsl(0, 0%, 96%) 5%,
hsl(0, 0%, 97%) 25%,
hsl(0, 0%, 95%) 40%,
hsl(0, 0%, 81%) 95%,
white
);
}最后，为画面增加入场动画
.cable {
animation: show 5s linear infinite;
}
@keyframes show {
0% {
transform: translateX(100vw);
}
20%, 100% {
transform: translateX(0);
}
}大功告成！
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