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JavaScript で動的オーバーライド時にもとのメソッドを呼び出す方法


var anObject = {
  state: "hoge", 
  getState: function () { return this.state; }

anObject.getState(); // "hoge"

anObject.getState = (function () { 
  var context = anObject;
  var original = anObject.getState;
  return function () { return "state: " + original.call(context); };  // override-method

anObject.getState(); // "state: hoge"


1. JSにはクラスの概念が無いですが、「オブジェクトのメソッドを書き換える」ぐらいの意味で使っています

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