x.() 不是函数 Typescript

Question

所以我在这个类对象中有这个类，我实例化了它，但我无法调用它的函数。 IDE 允许我调用 getPoistionDiagram:

export class NodeW {
  childrenIds: string[];
  diagram?: {
    coordinates: {
      x: number;
      y: number;
    };
  } | null;
  nodeId: string;
  parameters: {
    childrens?: string[];
    name?: string;
    nodeNumber?: string;
    original?: string;
    cases?: any;
    parent?: any;
    extra?: any;
    copyIds?: any;
    copyNames?: any;
  };
  type: NodeType;

  constructor(
    childrenIds: string[],
    nodeId: string,
    parameters: {},
    type: NodeType,
    diagram?: { coordinates: { x: number; y: number } },
  ) {
    this.childrenIds = childrenIds;
    this.diagram = diagram;
    this.nodeId = nodeId;
    this.parameters = parameters;
    this.type = type;
  }

  getPositionDiagram(i: number): { x: number; y: number } {
    return {
      x: !this.diagram ? 20 * 10 : this.diagram.coordinates.x,
      y: !this.diagram ? i * 120 : this.diagram.coordinates.y,
    };
  }
}

export class NodesArray {
  private nodes: NodeW[];
  private createNewNodesService?: CreateNewNodesService;

  constructor(nodes?: NodeW[]) {
    if (nodes && nodes.length > 0) {
      this.nodes = nodes;
    } else {
      this.nodes = DEFAULT_NODE_ARRAY();
    }
  }

  getNodes(): NodeW[] {
    return this.nodes;
  }

  setNodes(nodes: any) {
    this.nodes = nodes;
  }

  getParentNode(nodeId: string) {
    for (let i = 0; i < this.nodes.length; i++) {
      if (this.nodes[i].childrenIds.includes(nodeId)) {
        return this.nodes[i].nodeId;
      }
    }
    return null;
  }
}

所以当我这样做时：

this.nodes?.getNodes()!.forEach((node: NodeW, i) => {       
node.getPositionDiagram(i) // => .getPoistonDiagram() is not a function  
});

尝试使用我拥有的属性内的方法。它不允许我访问NodeW的方法，而且当我检查它时它说不是一个typeOf NodeW。

与 froEach() 相关吗？

Answer 1

我认为，您的 NodeW 类无法访问 getNodes，因为这是 NodesArray 内部的方法，因此，您无法访问 getPoisitionDiagram。您不需要访问 getNode:

this.nodes?.getNodes()!.forEach((node: NodeW, i) => {       
node.getPositionDiagram(i) // => .getPositionDiagram() is not a function  
});

您需要：

this.nodes.forEach((node: NodeW, i) => {       
node.getPositionDiagram(i)  
});