Not a how-to guide — a why-it-works guide. From Brendan Eich's 10-day design decisions to V8 JIT deoptimization, covering all core ECMAScript mechanisms: type system, prototype chain, execution contexts, closures, event loop, Promise resolution algorithm, ESM module linking. Four-layer structure per chapter serves developers at every level. 35 chapters — the most in-depth ECMAScript internals guide in Chinese.
📖 Read the full book online (free): https://tools.yiteai.com/en/books/ecmascript
A deep-dive technical book by YiteAI. This repo is the companion index — every chapter links to the full text on the site.
- Built in 10 Days: Brendan Eich's Design Trade-offs and JavaScript's Historical Debt
- ES1 to ES2027: What Each Version Fixed and the TC39 Stage 0-4 Process
- How to Read the ECMAScript Spec: Notation, Abstract Operations, Algorithm Steps
- Source to Execution: The Complete V8 Engine Pipeline
- 8 Language Types and Their Internal Representations
- ToPrimitive: The Complete Object-to-Primitive Conversion Algorithm
- Abstract Equality: Deriving All 12 Rules of ==
- IEEE 754 and Number Precision: The Real Reason 0.1+0.2 Fails
- BigInt and Symbol: The Design Philosophy Behind Two Special Types
- String and Unicode: UTF-16, Surrogate Pairs, and Code Point Traps
- Operator Algorithms: +, delete, in, instanceof, typeof, ?. and ??
- Property Descriptors: 4 Internal Slots and Object.defineProperty
- The Prototype Chain: Complete [[Prototype]] Lookup Algorithm
- Ordinary and Exotic Objects: [[Get]], [[Set]], [[Call]] Internal Methods
- Proxy and Reflect: 13 Traps and Complete Metaprogramming
- Execution Context Stack and Realm: Call Stack Structure and Cross-Realm Traps
- Environment Records and Reference Records: The Complete Scope Chain
- var, let, const: Spec-Level Differences and the Temporal Dead Zone
- Closures: The Precise Definition of Function + Lexical Environment
- this: 5 Binding Rules, Priority Order, and ResolveThisBinding
- Function Object Internals: [[Call]] vs [[Construct]], arguments, bind, Tail Calls
- Generators and the Iteration Protocol: Complete Symbol.iterator Implementation
- Under the Hood of class: ClassDefinitionEvaluation and Private Fields
- async/await: The Complete Desugaring to Generator Form
- The Event Loop: Spec-Level Definitions of Job Queue and Task Queue
- Promises: PromiseCapability and the Resolution Algorithm
- The Microtask Queue: A Complete Proof of Execution Order
- Error and Completion Record: Spec Semantics of try/catch/finally
- SharedArrayBuffer and Atomics: The Memory Model for Multi-threaded JS
- ESM: Linking, Instantiation, Evaluation Phases and Circular Dependencies
- Automatic Semicolon Insertion: 7 Rules and Classic Traps
- Destructuring and Spread: Spec Semantics and Edge Behaviors
- Iterators and the Iterable Protocol: How for...of Really Works
- V8 Internals: Hidden Classes, Inline Caches, and JIT Deoptimization
- Memory Management: Generational GC, WeakRef, and DevTools Memory Profiling
不教你怎么写 JS，教你 JS 为什么这样运行。从 Brendan Eich 的10天设计决策到 V8 引擎 JIT 反优化，覆盖 ECMAScript 规范全部核心机制：类型系统、原型链、执行上下文、闭包、事件循环、Promise 解析算法、ESM 模块链接……每章四层结构，同时服务1-3年、3-5年和资深 JavaScript 开发者。35章，中文最深度的 ECMAScript 原理完全指南。
📖 在线免费阅读全文:https://tools.yiteai.com/books/ecmascript
- 10天造出的语言：Brendan Eich 的设计取舍与历史债务
- ES1 到 ES2027：每个版本解决了什么，TC39 提案 Stage 0-4
- 如何读 ECMAScript 规范：符号、抽象操作、算法步骤
- 从源码到执行：V8 引擎的完整链路
- 8种语言类型与内部表示
- ToPrimitive：对象转基础类型的完整算法
- 抽象相等比较：== 的12条规则完整推导
- IEEE 754 与 Number 精度：0.1+0.2 的底层真相
- BigInt 与 Symbol：两个特殊类型的设计哲学
- String 与 Unicode：UTF-16、代理对与码点陷阱
- 运算符的规范算法：+、delete、in、instanceof、typeof、?.、??
- 属性描述符：4个内部槽与 Object.defineProperty
- 原型链：[[Prototype]] 查找算法的完整机制
- 普通对象与异质对象：[[Get]][[Set]][[Call]] 内部方法
- Proxy 与 Reflect：13个陷阱与元编程完整实现
- 执行上下文栈与 Realm：调用栈结构与跨领域陷阱
- 环境记录与 Reference Record：作用域链的完整机制
- var/let/const：三种绑定的规范级差异与 TDZ
- 闭包：函数 + 词法环境的精确定义
- this：5种绑定规则、优先级与 ResolveThisBinding
- 函数对象内部结构：[[Call]] vs [[Construct]]、arguments、bind、尾调用
- 生成器与迭代协议：Symbol.iterator 的完整实现
- class 的底层：ClassDefinitionEvaluation 与私有字段
- async/await：Generator 语法糖的完整脱糖形态
- 事件循环：Job Queue 与 Task Queue 的规范定义
- Promise：PromiseCapability 与解析算法
- 微任务队列：执行顺序的完整证明
- Error 与 Completion Record：try/catch/finally 规范语义
- SharedArrayBuffer 与 Atomics：多线程 JS 的内存模型
- ESM：链接、实例化、求值三阶段与循环依赖处理
- ASI 自动分号插入：7条规则与经典陷阱
- 解构与展开：规范语义与边界行为
- 迭代器与可迭代协议：for...of 的完整内部机制
- V8 内部：Hidden Class、内联缓存与 JIT 反优化
- 内存管理：分代回收、WeakRef 与 DevTools 内存分析
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