给我一个cocos中使用js实现四叉树碰撞的代码

下面是一个简单的使用 JavaScript 和 Cocos Creator 实现四叉树碰撞检测的代码示例：

cc.Class({
  extends: cc.Component,

  properties: {
    // 碰撞检测范围
    bounds: cc.Rect,
    // 节点是否为叶子节点
    isLeaf: false,
    // 子节点
    children: [],
    // 存储的物体列表
    objects: [],
    // 最大存储数量
    maxObjects: 10,
    // 最大深度
    maxDepth: 4,
    // 当前深度
    depth: 0
  },

  onLoad() {
    // 初始化四叉树
    this.initQuadtree(this.bounds, this.depth);
  },

  initQuadtree(bounds, depth) {
    // 如果当前深度已达到最大深度，或者存储的物体数量已经超过最大存储数量，将该节点标记为叶节点
    if (depth >= this.maxDepth || this.objects.length <= this.maxObjects) {
      this.isLeaf = true;
      return;
    }

    // 计算四个子矩形的位置和大小
    let halfWidth = bounds.width / 2;
    let halfHeight = bounds.height / 2;
    let leftBounds = cc.rect(bounds.x, bounds.y, halfWidth, bounds.height);
    let bottomBounds = cc.rect(bounds.x, bounds.y, bounds.width, halfHeight);
    let rightBounds = cc.rect(bounds.x + halfWidth, bounds.y, halfWidth, bounds.height);
    let topBounds = cc.rect(bounds.x, bounds.y + halfHeight, bounds.width, halfHeight);

    // 创建四个子节点
    this.children[0] = new Quadtree(leftBounds, depth + 1);
    this.children[1] = new Quadtree(bottomBounds, depth + 1);
    this.children[2] = new Quadtree(rightBounds, depth + 1);
    this.children[3] = new Quadtree(topBounds, depth + 1);
  },

  // 将物体添加到四叉树中
  insert(object) {
    // 如果当前节点不是叶节点，则将物体添加到合适的子节点中
    if (!this.isLeaf) {
      let index = this.getIndex(object);
      this.children[index].insert(object);
      return;
    }

    // 如果当前节点是叶节点，则将物体添加到当前节点存储的物体列表中
    this.objects.push(object);

    // 如果当前存储的物体数量已经超过最大存储数量，则需要将当前节点分裂为四个子节点
    if (this.objects.length > this.maxObjects && this.depth < this.maxDepth) {
      for (let i = 0; i < this.objects.length; i++) {
        let index = this.getIndex(this.objects[i]);
        this.children[index].insert(this.objects[i]);
      }
      this.objects = [];
      this.isLeaf = false;
    }
  },

  // 获取物体所在的子节点索引
  getIndex(object) {
    let objectBounds = object.getBoundingBox();
    let leftBounds = cc.rect(this.bounds.x, this.bounds.y, this.bounds.width / 2, this.bounds.height);
    let bottomBounds = cc.rect(this.bounds.x, this.bounds.y, this.bounds.width, this.bounds.height / 2);
    let rightBounds = cc.rect(this.bounds.x + this.bounds.width / 2, this.bounds.y, this.bounds.width / 2, this.bounds.height);
    let topBounds = cc.rect(this.bounds.x, this.bounds.y + this.bounds.height / 2, this.bounds.width, this.bounds.height / 2);

    if (cc.Intersection.rectRect(objectBounds, leftBounds)) {
      return 0;
    } else if (cc.Intersection.rectRect(objectBounds, bottomBounds)) {
      return 1;
    } else if (cc.Intersection.rectRect(objectBounds, rightBounds)) {
      return 2;
    } else if (cc.Intersection.rectRect(objectBounds, topBounds)) {
      return 3;
    }

    return -1;
  },

  // 获取与物体相交的物体列表
  retrieve(object) {
    let index = this.getIndex(object);
    let objects = this.objects;
    if (!this.isLeaf) {
      objects = objects.concat(this.children[index].retrieve(object));
    }
    for (let i = 0; i < objects.length; i++) {
      if (object.getBoundingBox().intersects(objects[i].getBoundingBox())) {
        result.push(objects[i]);
      }
    }
    return objects;
  }
});

需要注意的是，这只是一个简单的实现示例，实际使用时可能需要根据具体需求进行优化和修改。