function drawPolygonPath(sideNum, radius, originX, originY, ctx){
  ctx.beginPath();
  const unitAngle = Math.PI * 2 / sideNum; //計(jì)算單元角度
  let angle = 0; //初始角度
  let xLength, yLength;
  // ctx.moveTo(originX, originY);
  for(let i = 0; i < sideNum; i++){ //遍歷計(jì)算點(diǎn)，并lineTo()繪制路徑
    xLength = radius * Math.cos(angle);
    yLength = radius * Math.sin(angle);
    ctx.lineTo(originX + xLength, originY - yLength);//繪制路徑
    angle += unitAngle;
  }
  ctx.closePath();//閉合路徑，也可在for循環(huán)中多一次循環(huán)lineTo()至起點(diǎn)
}