gistfile1

var dog = {
    home: 'Doggy house',
    bark: function() {
        alert(this + ' is me.');
        alert(this.home + ' is my home!');
    }
};

dog.bark(); // [object Object] is me. Doggy house is my home.

{bark: dog.bark}.bark(); // 5 分
(dog.bark, dog.bark)(); // 5 分
dog.bark.call(dog); // 5 分
[dog.bark][0](); // 10 分