TL 你不知道的JavaScript（下卷）

搬运工

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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vi ｜ 目录
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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目录 ｜ vii
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 [[Prototype]] ....................................................................................................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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目录 ｜ ix
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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