JS计算两条直线的夹角
const getAngle = ({ x: x1, y: y1 }, { x: x2, y: y2 }) => { const dot = x1 * x2 + y1 * y2 const det = x1 * y2 - y1 * x2 const angle = Math.atan2(det, dot) / Math.PI * 180 return Math.round(angle + 360) % 360 } const angle = getAngle({ x: x1 - x3, y: y1 - y3, }, { x: x2 - x3, y: y2 - y3, }); console.log(angle);
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