Question

我有这个Node类：

export const symbols = {
  parent: Symbol('@xml.js.parent'),
};

export class Node {

  [key: string]: any;

  constructor(parent: Node, name: string) {


    Object.defineProperty(this, symbols.parent, {
      value: parent,
      writable: true,
      enumerable: false
    });

  }

}

我创建了一个新节点，然后尝试删除其中一个符号键：

/Users/alexamil/WebstormProjects/oresoftware/xml.json/dist/index.js:141
                    delete self.currentNode[exports.symbols.parent];
                                                            ^

TypeError: Cannot delete property 'Symbol(@xml.js.parent)' of #<Node>
    at ReadStream.<anonymous> (/Users/alexamil/WebstormProjects/oresoftware/xml.json/dist/index.js:141:61)
    at ReadStream.emit (events.js:159:13)
    at addChunk (_stream_readable.js:265:12)
    at readableAddChunk (_stream_readable.js:248:13)
    at ReadStream.Readable.push (_stream_readable.js:209:10)
    at onread (fs.js:2115:12)
    at FSReqWrap.wrapper [as oncomplete] (fs.js:676:17)

被这条线绊倒：

 delete self.currentNode[exports.symbols.parent];

有谁知道为什么我不能删除该属性？由于符号道具的writable设置为true，因此它似乎应该可以工作，但是idk。

Answer 1

看起来我需要将configurable道具设置为true

    Object.defineProperty(this, symbols.parent, {
      value: parent,
      writable: true,
      enumerable: false,
      configurable: true
    });

TypeError：无法删除＃<node>的属性'Symbol（@ xml.js.parent）'

1 个答案: