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作用域和闭包

作用域：示例

词法作用域

Variable Access Object Oriented JavaScript

Variable Access Object Oriented JavaScript

作用域限制

调用函数

执行环境简介

执行环境与词法作用域

内存中的数据存储

内存作用域与内存对象

Predicting Execution Context Output Object Oriented JavaScript

Predicting Execution Context Output Object Oriented JavaScript

构建多个执行作用域

Continuing Output Predictions Object Oriented JavaScript

Continuing Output Predictions Object Oriented JavaScript

Finishing Our Predictions Object Oriented JavaScript

Finishing Our Predictions Object Oriented JavaScript

闭包简介

Retaining Access to Functions Object Oriented JavaScript

Retaining Access to Functions Object Oriented JavaScript

Predicting Code Output Object Oriented JavaScript

Predicting Code Output Object Oriented JavaScript

Predicting Execution Contexts Object Oriented JavaScript

Predicting Execution Contexts Object Oriented JavaScript

Predicting Closure Output Object Oriented JavaScript

Predicting Closure Output Object Oriented JavaScript

Predicting Closure Output 2 Object Oriented JavaScript

Predicting Closure Output 3 Object Oriented JavaScript

Predicting Closure Output 3 Object Oriented JavaScript

Predicting Closure Output 4 Object Oriented JavaScript

Predicting Closure Output 4 Object Oriented JavaScript

Predicting Closure Output 5 Object Oriented JavaScript

Predicting Closure Output 5 Object Oriented JavaScript

Predicting Execution Contexts 2 Object Oriented JavaScript

Predicting Execution Contexts 2 Object Oriented JavaScript

Predicting Closure Output 6 Object Oriented JavaScript

Predicting Closure Output 6 Object Oriented JavaScript

小结

简介

定义关键字 this

this 不会绑定的

this 所绑定的

Predicting Parameter Output Object Oriented JavaScript

Predicting Parameter Output Object Oriented JavaScript

Predicting Parameter Output 2 Object Oriented JavaScript

Predicting Parameter Output 2 Object Oriented JavaScript

Predicting this Output Object Oriented JavaScript

Predicting this Output Object Oriented JavaScript

Predicting this Output 2 Object Oriented JavaScript

Predicting this Output 2 Object Oriented JavaScript

Predicting this Output 3 Object Oriented JavaScript

Predicting this Output 3 Object Oriented JavaScript

Predicting this Output 4 Object Oriented JavaScript

Predicting this Output 3 Object Oriented JavaScript

Predicting this Output 5 Object Oriented JavaScript

Predicting this Output 5 Object Oriented JavaScript

Deconstructing setTimeout Object Oriented JavaScript

Deconstructing setTimeout Object Oriented JavaScript

Predicting this Output 6 Object Oriented JavaScript

Predicting this Output 6 Object Oriented JavaScript

Determining this Binding Object Oriented JavaScript

Determining this Binding Object Oriented JavaScript

Predicting this Output 7 Object Oriented JavaScript

Predicting this Output 7 Object Oriented JavaScript

预测 this 输出 8

Predicting this Output 9 Object Oriented JavaScript

Predicting this Output 9 Object Oriented JavaScript

Predicting this Output with new Object Oriented JavaScript

Predicting this Output with new Object Oriented JavaScript

小结

原型链

属性查找

一次性属性复制

Predicting Prototype Delegation Object Oriented JavaScript

Predicting Prototype Delegation Object Oriented JavaScript

Predicting Undefined Property Lookups Object Oriented JavaScript

Predicting Undefined Property Lookups Object Oriented JavaScript

Property Lookup on Cloned Objects Object Oriented JavaScript

Property Lookup on Cloned Objects Object Oriented JavaScript

Property Lookup of Delegated Objects Object Oriented JavaScript

Property Lookup of Delegated Objects Object Oriented JavaScript

对象原型

构造函数属性

Array Prototype Object Oriented JavaScript

Array Prototype Object Oriented JavaScript

小结

代码重复使用

代码重复使用示例

为我们的游戏编程

函数

重构代码的好处

修饰器函数

Adding Methods to Constructors Object Oriented JavaScript

Adding Methods to Constructors Object Oriented JavaScript

Predicting the Value of this Object Oriented JavaScript

Predicting the Value of this Object Oriented JavaScript

回顾 this 参数

Refactoring to Consolidate Code Object Oriented JavaScript

Refactoring to Consolidate Code Object Oriented JavaScript

Predicting Strict Comparison of Objects Object Oriented JavaScript

Predicting Strict Comparison of Objects Object Oriented JavaScript

Strict Comparison of Returned Functions Object Oriented JavaScript

Strict Comparison of Returned Functions Object Oriented JavaScript

Refactoring the move Method Object Oriented JavaScript

Refactoring the move Method Object Oriented JavaScript

小结

Introduction to Classes Object Oriented JavaScript

Decorator code vs Classes Object Oriented JavaScript

Reducing duplicity Object Oriented JavaScript

Reducing duplicity Object Oriented JavaScript

this parameter Object Oriented JavaScript

Functional shared patterns Object Oriented JavaScript

Adding methods to classes Object Oriented JavaScript

Property access Object Oriented JavaScript

Conclusion Object Oriented JavaScript

提高性能

提高性能的一种方法

Delegation Relationships Object Oriented JavaScript

Delegation Relationships Object Oriented JavaScript

构造函数原型

原型如何影响内存中的模型

prototype 与 method

prototype 概念的歧义

prototype constructor Object Oriented JavaScript

prototype constructor Object Oriented JavaScript

7q instanceof operator Object Oriented JavaScript

instanceof operator Object Oriented JavaScript

小结

Introduction Object Oriented JavaScript

Introduction Object Oriented JavaScript

Constructor Mode Object Oriented JavaScript

Constructor Mode Object Oriented JavaScript

模式之间的差异

类的编码风格

小结

Introduction Object Oriented JavaScript

Building Similar Objects Object Oriented JavaScript

Building Similar Objects Object Oriented JavaScript

Manually Duplicating Code Object Oriented JavaScript

Refactoring Into a Superclass Object Oriented JavaScript

Refactoring Into a Superclass Object Oriented JavaScript

Outro Object Oriented JavaScript

Pseudoclassical Subclasses Object Oriented JavaScript

Pseudoclassical Subclasses Object Oriented JavaScript

Building Out a Subclass Object Oriented JavaScript

错误的解决方案

this in Superclass using new Object Oriented JavaScript

this in Superclass using new Object Oriented JavaScript

this in Superclass without using new Object Oriented JavaScript

this in Superclass without using new Object Oriented JavaScript

call s First Argument Object Oriented JavaScript

6s Quiz Object Oriented JavaScript

使用 call

Subclass Property Prototype Delegation Object Oriented JavaScript

Subclass Property Prototype Delegation Object Oriented JavaScript

Subclass Method Prototype Delegation Object Oriented JavaScript

Subclass Method Prototype Delegation Object Oriented JavaScript

Constructor Prototype Delegation Object Oriented JavaScript

Constructor Prototype Delegation Object Oriented JavaScript

Subclass Prototype Delegation Object Oriented JavaScript

Subclass Prototype Delegation Object Oriented JavaScript

Incorrect Subclass Prototype Delegation Object Oriented JavaScript

Incorrect Subclass Prototype Delegation Object Oriented JavaScript

使用 Object create

Subclass Prototype Constructor Property Object Oriented JavaScript

Subclass Prototype Constructor Property Object Oriented JavaScript

Subclass Constructor Delegation Object Oriented JavaScript

Subclass Constructor Delegation Object Oriented JavaScript

Proper Subclass Constructor Delegation Object Oriented JavaScript

Proper Subclass Constructor Delegation Object Oriented JavaScript

伪类子类小结

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To be more precise, JavaScript is a prototype based object oriented language, which means it doesn't have classes rather it define behaviors using constructor function and then reuse it using the prototype.

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