javascript - 从原型(prototype)函数访问原型(prototype)值

Question

如何访问从 removeConnection() 函数原型(prototype)化的 open 数组？现在，当我调用该函数时，我收到 ReferenceError: open is not Defined 。

function Connections() {}
Connections.prototype.open = [];

Object.defineProperty(Connections.prototype, 'total', {
  get: function total() {
    return this.open.length;
  }
});

Connections.prototype.removeConnection = function(res) {
  this.open = open.filter(function(storedRes) {
    if (storedRes !== res) {
      return storedRes;
    }
  });
}

var connections = new Connections();

Answer 1

对我来说，它引发了一个不同的错误Uncaught TypeError: open.filter is not a function，解决方法是将this.open = open.filter更改为this.open = this.open.filter.

查看可运行示例:

function Connections() {}
Connections.prototype.open = [];

Object.defineProperty(Connections.prototype, 'total', {
  get: function total() {
    return this.open.length;
  }
});

Connections.prototype.removeConnection = function(res) {
  this.open = this.open.filter(function(storedRes) {
    if (storedRes !== res) {
      return storedRes;
    }
  });
}

var connections = new Connections();

connections.open = ['one', 'two']
alert(connections.open)
connections.removeConnection('one')
alert(connections.open)