How is 'this' working in this context?

This question already has an answer here:

Javascript “this” pointer within nested function 7 answers

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The mainState is an object literal. 'prototype' is a property of function object in javascript used for prototype inheritance. Javascript Prototype

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有一件事总是帮助我记住this将是什么，以查找谁在调用函数，请检查此代码段

var sayHi = function() { console.log(this.name) }

var yoda = { name: "Yoda", sayHi: sayHi }
var darthVader = { name: "Anakin Skywalker", sayHi: sayHi }

// the `this` here will be the yoda object
yoda.sayHi()
// the `this` here will be the darthVader object
darthVader.sayHi()

window.name = "Global name"
// here, since nothing was specified, the object is the global object, or the window on browsers, this the same as "window.sayHi()"
sayHi()

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如果你想在原型上使用你的方法，你可以创建一个MainState构造函数，并附上你的原型方法：

function MainState(game) { 
    this.game = game;
}

MainState.prototype.create = function() {
    this.bird = this.game.add.sprite(100, 245, 'bird');
};

MainState.prototype.myFunction = function() { };

// etc.

var mainState = new MainState(game);

mainState.myFunction();

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