画一个扇形图,使用常规方法可能很难画,但是用锥形渐变的话非常好画
<style>.pattern{width: 100px; height: 100px;border-radius: 50%;background: conic-gradient(yellow 30deg , black 30deg , black 90deg , yellow 90deg ,yellow 150deg , black 150deg , black 210deg , yellow 210deg , yellow 270deg , black 270deg , black 330deg , yellow 330deg , yellow 360deg );}
</style>
<body><div class="pattern"></div>
</body>