带有 getter 和 setter 的 JavaScript 类导致 RangeError : Maximum call stack size exceeded

Question

我目前正在试验 ECMA6 类。 我当前的类(class)如下所示

class Player {
  constructor(id) {
    this.id = id;
    this.cash = 350;
  }

  get cash() {
    return this.cash;
  }

  set cash(value) { // line 19
    this.cash = value; // line 20
  }
};

当我现在通过调用 let playerObject = new Player(1); 创建一个新对象时，我收到以下错误

...\node_modules\mysql\lib\protocol\Parser.js:82
        throw err;
              ^
RangeError: Maximum call stack size exceeded
    at Player.cash (player.js:19:11)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
    at Player.cash (player.js:20:15)
Press enter to exit

这和mysql库有什么关系？为什么错误在同一行中多次出现？我只调用一次。

Answer 1

您的“cash”setter 调用“cash”setter，后者调用“cash”setter，后者调用“cash”setter...

在 setter 中通过其自己的名称访问属性 setter 会创建一个无限递归函数调用。