javascript - javascript中从 "private"对象调用 "parent"方法

Question

在下面的代码中，我需要调用子类Worker中的“私有(private)”方法run

function Person(scope, ...) {
  scope.name = "Juan";

  var run = function() {
     console.log(scope.name + " is running");
  };
}

function Worker(scope, ...) {
  Person.call(this, scope, ...);

  var jumpAndRun = function() {
     console.log(scope.name + " is jumping");
     run(); // how to call this
  };
}

Worker.prototype = Object.create(People.prototype);

目前，如果我调用 run 方法，我会得到一个错误:run 未定义!

Answer 1

抱歉，无法执行此操作，除非 People 类(应称为 Person)使该方法可用。

常见的做法是使“私有(private)”方法以下划线开头。它并不 100% 授予任何安全性，但它至少给其他开发人员一个暗示，表明它是私有(private)的。

function Person(scope, ...) {
  scope.name = "Juan";

  var run = function() {
     console.log(scope.name + " is running");
  };

  this._run = run;
}

function Worker(scope, ...) {
  Person.call(this, scope, ...);

  var jumpAndRun = function() {
     console.log(scope.name + " is jumping");
     this._run(); // how to call this
  };
}