使用JavaScript在3D空间中查找3个点之间的角度

// 定义三个点的坐标
var point1 = { x: 1, y: 2, z: 3 };
var point2 = { x: 4, y: 5, z: 6 };
var point3 = { x: 7, y: 8, z: 9 };

// 计算两个向量
var vector1 = { x: point2.x - point1.x, y: point2.y - point1.y, z: point2.z - point1.z };
var vector2 = { x: point3.x - point1.x, y: point3.y - point1.y, z: point3.z - point1.z };

// 计算两个向量的点积
var dotProduct = vector1.x * vector2.x + vector1.y * vector2.y + vector1.z * vector2.z;

// 计算两个向量的模
var magnitude1 = Math.sqrt(vector1.x * vector1.x + vector1.y * vector1.y + vector1.z * vector1.z);
var magnitude2 = Math.sqrt(vector2.x * vector2.x + vector2.y * vector2.y + vector2.z * vector2.z);

// 计算角度（弧度）
var angle = Math.acos(dotProduct / (magnitude1 * magnitude2));

// 将弧度转换为角度
var angleDegrees = angle * 180 / Math.PI;

console.log("两个向量之间的角度为：" + angleDegrees + "度");