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第363天 前端面试问题

[js] 第363天 使用ajax轮询接口有什么优缺点?

[html] 第363天 打印页面时怎样自定义打印页眉页脚或者去掉眉页脚?

[css] 第363天 用css画出中间一个大圆,四周有12个小圆环绕并和大圆是同心

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<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<div class="demo">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
</div>

<style>
.demo {
width: 600px;
height: 600px;
background-color: #000000;
padding: 100px;
box-sizing: border-box;
}

ul,
li {
margin: 0;
list-style-type: none;
padding: 0;
}

ul {
width: 400px;
height: 400px;
background-color: #fff;
border-radius: 50%;
position: relative;
}

li {
width: 40px;
height: 40px;
position: absolute;
background-color: red;
border-radius: 50%;
line-height: 40px;
text-align: center;
left: 50%;
margin-left: -20px;
margin-top: -20px;
transform-origin: 20px 220px;
}

li:nth-of-type(2) {
transform: rotate(45deg);
}

li:nth-of-type(3) {
transform: rotate(90deg);
}

li:nth-of-type(4) {
transform: rotate(135deg);
}

li:nth-of-type(5) {
transform: rotate(180deg);
}

li:nth-of-type(6) {
transform: rotate(225deg);
}

li:nth-of-type(7) {
transform: rotate(270deg);
}

li:nth-of-type(8) {
transform: rotate(315deg);

}
</style>

</html>