使用canvas画美队盾牌

代码如下：

<canvas class="mycanvas" width="500" height="500">
            你的浏览器不支持canvas
        canvas>
        <script type="text/javascript">
            let mycanvas = document.querySelector('.mycanvas');
            let c = mycanvas.getContext('2d');
            //为了防止样式覆盖，从外往里画
            //画一个大圆
            c.beginPath();
            c.arc(250, 250, 160, 0, Math.PI * 2);
            c.fillStyle = "#e0dedf";
            c.fill();
            c.lineWidth = 30;
            c.strokeStyle = 'rgb(196,30,58)';
            c.stroke();

            //画一个小圆
            c.beginPath();
            c.arc(250, 250, 100, 0, Math.PI * 2);
            c.fillStyle = "rgb(0,43,127)";
            c.fill();
            c.lineWidth = 30;
            c.strokeStyle = 'rgb(196,30,58)';
            c.stroke();

            //画五角星
            c.beginPath();
            for(let i = 0; i < 5; i++) {
                c.lineTo(Math.cos((18 + i * 72) / 180 * Math.PI) * 80 + 250, -Math.sin((18 + i * 72) / 180 * Math.PI) * 80 + 250);
                c.lineTo(Math.cos((54 + i * 72) / 180 * Math.PI) * 32 + 250, -Math.sin((54 + i * 72) / 180 * Math.PI) * 32 + 250);
            }
            c.closePath();
            c.fillStyle = "#e0dedf";
            c.fill();
            c.lineWidth = 1;
            c.strokeStyle = 'rgb(0,43,127)';
            c.stroke();

我这里只画了2个圆，只是把这两个圆的画笔宽度调大点，就形成了4个圆的效果