TL 你不知道的JavaScript（下卷）
前言 ..........................................................................................................................................................xi
致谢 .......................................................................................................................................................xvii
第一部分 起步上路
序 ...............................................................................................................................................................2
第 1 章 深入编程 ................................................................................................................................4
1.1 代码 .............................................................................................................................................4
1.2 表达式 .........................................................................................................................................5
1.3 实践 .............................................................................................................................................6
1.3.1 输出 ................................................................................................................................7
1.3.2 输入 ................................................................................................................................8
1.4 运算符 .........................................................................................................................................9
1.5 值与类型 ...................................................................................................................................11
1.6 代码注释 ...................................................................................................................................13
1.7 变量 ...........................................................................................................................................14
1.8 块 ...............................................................................................................................................16
1.9 条件判断 ...................................................................................................................................17
1.10 循环 .........................................................................................................................................18
1.11 函数 .........................................................................................................................................20
1.12 实践 .........................................................................................................................................23
1.13 小结 .........................................................................................................................................25
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第 2 章 深入 JavaScript .................................................................................................................26
2.1 值与类型 ...................................................................................................................................26
2.1.1 对象 ..............................................................................................................................28
2.1.2 内置类型方法 ..............................................................................................................30
2.1.3 值的比较 ......................................................................................................................31
2.2 变量 ...........................................................................................................................................35
2.3 条件判断 ...................................................................................................................................37
2.4 严格模式 ...................................................................................................................................39
2.5 作为值的函数 ...........................................................................................................................40
2.5.1 立即调用函数表达式 ..................................................................................................41
2.5.2 闭包 ..............................................................................................................................42
2.6 this 标识符 ..............................................................................................................................44
2.7 原型 ...........................................................................................................................................46
2.8 旧与新 .......................................................................................................................................47
2.8.1 polyfilling ......................................................................................................................47
2.8.2 transpiling .....................................................................................................................48
2.9 非 JavaScript .............................................................................................................................49
2.10 小结 .........................................................................................................................................50
第 3 章 深入“你不知道的 JavaScript”系列 .........................................................................51
3.1 作用域和闭包 ...........................................................................................................................51
3.2 this 和对象原型 ......................................................................................................................52
3.3 类型和语法 ...............................................................................................................................53
3.4 异步和性能 ...............................................................................................................................53
3.5 ES6 及更新版本 .......................................................................................................................54
3.6 小结 ...........................................................................................................................................55
第二部分 ES6 及更新版本
序 .............................................................................................................................................................58
第 1 章 ES? 现在与未来 ................................................................................................................59
1.1 版本 ...........................................................................................................................................60
1.2 transpiling ..................................................................................................................................61
1.3 小结 ...........................................................................................................................................63
第 2 章 语法 .......................................................................................................................................64
2.1 块作用域声明 ...........................................................................................................................64
2.1.1 let 声明 ........................................................................................................................65
2.1.2 const 声明 ....................................................................................................................68
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2.1.3 块作用域函数 ..............................................................................................................70
2.2 spread/rest ..................................................................................................................................71
2.3 默认参数值 ...............................................................................................................................73
2.4 解构 ...........................................................................................................................................77
2.4.1 对象属性赋值模式 ......................................................................................................78
2.4.2 不只是声明 ..................................................................................................................79
2.4.3 重复赋值 ......................................................................................................................81
2.5 太多，太少，刚刚好 ...............................................................................................................83
2.5.1 默认值赋值 ..................................................................................................................84
2.5.2 嵌套解构 ......................................................................................................................84
2.5.3 解构参数 ......................................................................................................................85
2.6 对象字面量扩展 .......................................................................................................................90
2.6.1 简洁属性 ......................................................................................................................90
2.6.2 简洁方法 ......................................................................................................................90
2.6.3 计算属性名 ..................................................................................................................95
2.6.4 设定 [] ....................................................................................................96
2.6.5 super 对象 ....................................................................................................................97
2.7 模板字面量 ...............................................................................................................................98
2.7.1 插入表达式 ..................................................................................................................99
2.7.2 标签模板字面量 ........................................................................................................100
2.8 箭头函数 .................................................................................................................................103
2.9 for..of 循环 ..........................................................................................................................109
2.10 正则表达式 ...........................................................................................................................111
2.10.1 Unicode 标识 ..........................................................................................................111
2.10.2 定点标识 .................................................................................................................112
2.10.3 正则表达式 flags ..................................................................................................116
2.11 数字字面量扩展 ...................................................................................................................117
2.12 Unicode .................................................................................................................................118
2.12.1 支持 Unicode 的字符串运算 .................................................................................119
2.12.2 字符定位 .................................................................................................................121
2.12.3 Unicode 标识符名 ..................................................................................................123
2.13 符号 .......................................................................................................................................123
2.13.1 符号注册 .................................................................................................................125
2.13.2 作为对象属性的符号 .............................................................................................127
2.14 小结 .......................................................................................................................................128
第 3 章 代码组织 ............................................................................................................................129
3.1 迭代器 .....................................................................................................................................129
3.1.1 接口 ............................................................................................................................130
3.1.2 next() 迭代 ................................................................................................................131
3.1.3 可选的 return(..) 和 throw(..) .............................................................................132
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3.1.4 迭代器循环 ................................................................................................................133
3.1.5 自定义迭代器 ............................................................................................................134
3.1.6 迭代器消耗 ................................................................................................................137
3.2 生成器 .....................................................................................................................................138
3.2.1 语法 ............................................................................................................................139
3.2.2 迭代器控制 ................................................................................................................144
3.2.3 提前完成 ....................................................................................................................147
3.2.4 错误处理 ....................................................................................................................149
3.2.5 Transpile 生成器 ........................................................................................................151
3.2.6 生成器使用 ................................................................................................................152
3.3 模块 .........................................................................................................................................153
3.3.1 旧方法 ........................................................................................................................153
3.3.2 前进 ............................................................................................................................154
3.3.3 新方法 ........................................................................................................................156
3.3.4 模块依赖环 ................................................................................................................164
3.3.5 模块加载 ....................................................................................................................166
3.4 类 .............................................................................................................................................167
3.4.1 class ...........................................................................................................................168
3.4.2 extends 和 super .......................................................................................................169
3.4.3 new.target .................................................................................................................174
3.4.4 static .........................................................................................................................175
3.5 小结 .........................................................................................................................................176
第 4 章 异步流控制 .......................................................................................................................177
4.1 Promise ....................................................................................................................................177
4.1.1 构造和使用 Promise ..................................................................................................178
4.1.2 Thenable ......................................................................................................................180
4.1.3 Promise API ................................................................................................................181
4.2 生成器 + Promise....................................................................................................................183
4.3 小结 .........................................................................................................................................185
第 5 章 集合 .....................................................................................................................................187
5.1 TypedArray .............................................................................................................................187
5.1.1 大小端（Endianness） ................................................................................................188
5.1.2 多视图 ........................................................................................................................189
5.1.3 带类数组构造器 ........................................................................................................190
5.2 Map..........................................................................................................................................192
5.2.1 Map 值 ........................................................................................................................194
5.2.2 Map 键 ........................................................................................................................194
5.3 WeakMap ................................................................................................................................195
5.4 Set ............................................................................................................................................196
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5.5 WeakSet ..................................................................................................................................198
5.6 小结 .........................................................................................................................................199
第 6 章 新增 API ............................................................................................................................200
6.1 Array ........................................................................................................................................200
6.1.1 静态函数 Array.of(..) ............................................................................................200
6.1.2 静态函数 Array.from(..) ........................................................................................201
6.1.3 创建数组和子类型 ....................................................................................................204
6.1.4 原型方法 copyWithin(..) ........................................................................................205
6.1.5 原型方法 fill(..) ....................................................................................................206
6.1.6 原型方法 find(..) ....................................................................................................206
6.1.7 原型方法 findIndex(..) ..........................................................................................207
6.1.8 原型方法 entries()、values()、keys() ...............................................................208
6.2 Object .....................................................................................................................................209
6.2.1 静态函数 Object.is(..) ..........................................................................................209
6.2.2 静态函数 Object.getOwnPropertySymbols(..) ......................................................210
6.2.3 静态函数 Object.setPrototypeOf(..) ...................................................................210
6.2.4 静态函数 Object.assign(..) ...................................................................................211
6.3 Math ........................................................................................................................................212
6.4 Number .....................................................................................................................................214
6.4.1 静态属性 ....................................................................................................................214
6.4.2 静态函数 Number.isNaN(..) .....................................................................................214
6.4.3 静态函数 Number.isFinite(..) ...............................................................................215
6.4.4 整型相关静态函数 ....................................................................................................215
6.5 字符串 .....................................................................................................................................216
6.5.1 Unicode 函数 ..............................................................................................................217
6.5.2 静态函数 String.raw(..) ........................................................................................217
6.5.3 原型函数 repeat(..) ................................................................................................217
6.5.4 字符串检查函数 ........................................................................................................218
6.6 小结 .........................................................................................................................................218
第 7 章 元编程 ................................................................................................................................219
7.1 函数名称 .................................................................................................................................219
7.2 元属性 .....................................................................................................................................222
7.3 公开符号 .................................................................................................................................223
7.3.1 Symbol.iterator........................................................................................................223
7.3.2 Symbol.toStringTag 与 Symbol.hasInstance .........................................................224
7.3.3 Symbol.species .........................................................................................................225
7.3.4 Symbol.toPrimitive ..................................................................................................226
7.3.5 正则表达式符号 ........................................................................................................226
7.3.6 Symbol.isConcatSpreadable ....................................................................................227
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7.3.7 Symbol.unscopables .................................................................................................. 228
7.4 代理 .........................................................................................................................................228
7.4.1 代理局限性 ................................................................................................................231
7.4.2 可取消代理 ................................................................................................................232
7.4.3 使用代理 ....................................................................................................................233
7.5 Reflect API ............................................................................................................................240
7.6 特性测试 .................................................................................................................................243
7.7 尾递归调用（Tail Call Optimization,TCO） ..........................................................................245
7.7.1 尾调用重写 ................................................................................................................247
7.7.2 非 TCO 优化 ..............................................................................................................248
7.7.3 元在何处 ....................................................................................................................250
7.8 小结 .........................................................................................................................................251
第 8 章 ES6 之后 ...........................................................................................................................253
8.1 异步函数 .................................................................................................................................254
8.2 Object.observe(..) ..............................................................................................................257
8.2.1 自定义改变事件 ........................................................................................................258
8.2.2 结束观测 ....................................................................................................................259
8.3 幂运算符 .................................................................................................................................260
8.4 对象属性与 ... ......................................................................................................................260
8.5 Array#includes(..) ..............................................................................................................261
8.6 SIMD .......................................................................................................................................262
8.7 WebAssembly (WASM) .........................................................................................................262
8.8 小结 .........................................................................................................................................264
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