Css 画出一个扇形，附代码

 

<div class="sector"></div>

.sector{
      width: 200px;
      height: 200px;
      border-radius: 200px;
      background-color: deepskyblue;
      position: relative;
    }
    .sector::before{
      content: "";
      width: 200px;
      height: 200px;
      position: absolute;
      background-color: white;
      border-radius: 200px;
      /*裁减半圆，再做旋转*/
      clip: rect(0px,100px,200px,0);
      transform: rotate(-60deg);
    }
    .sector::after{
      content: "";
      width: 200px;
      height: 200px;
      position: absolute;
      background-color: white;
      border-radius: 200px;
      /*裁减半圆，再做旋转*/
      clip: rect(0px,200px,200px,100px);
      transform: rotate(60deg);
    }

方式二

<>
  <style>
    #demo {
      position: relative;
      width: 50px;
      height: 50px;
      overflow: hidden;
    }
    #circle {
      position: absolute;
      width: 100px;
      height: 100px;
      background-color: black;
      border-radius: 50%;
    }
  </style>
  <body>
    <div id="demo">
      <div id="circle"></div>
    </div>
  </body>
</>

方式三

<!DOCTYPE >
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>画出一个扇形</title>
<style>
#sector {
width: 0;
height: 0;
border: 100px solid;
border-radius: 100px;
border-color: orangered transparent transparent transparent;
}
</style>
</head>
<body>
<div id="sector"></div>
</body>
</html>
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