ECMAScript规范-第三版_中文版

ECMAScript

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ECMAScript Language

Specification

262

Edition 3 Final

2010-4-10

目录.......................................................................................................................................................2

简史............................................................................................................................................................5

1 作用范围................................................................................................................................................6

2 前言........................................................................................................................................................7

3 参考文献................................................................................................................................................8

4 概述........................................................................................................................................................9

4.1 网页脚本...................................................................................................................................9

4.2 语言概述.................................................................................................................................10

4.2.1 对象.............................................................................................................................10

4.3 定义.........................................................................................................................................12

4.3.1 类型 ............................................................................................................................12

4.3.2 原语值.........................................................................................................................12

4.3.3 对象.............................................................................................................................12

4.3.4 构造函数.....................................................................................................................12

4.3.5 原型.............................................................................................................................12

4.3.6 本地对象.....................................................................................................................12

4.3.7 内置对象.....................................................................................................................12

4.3.8 宿主对象.....................................................................................................................13

4.3.9 未定义值.....................................................................................................................13

4.3.10 Undefined 类型.........................................................................................................13

4.3.11 空值...........................................................................................................................13

4.3.12 Null 类型...................................................................................................................13

4.3.13 布尔值.......................................................................................................................13

4.3.14 Boolean 类型.............................................................................................................13

4.3.15 Boolean 对象.............................................................................................................13

4.3.16 字符串值...................................................................................................................13

4.3.17 String 类型................................................................................................................14

4.3.18 String 对象................................................................................................................14

4.3.19 数值...........................................................................................................................14

4.3.20 Number 类型.............................................................................................................14

4.3.21 Number 对象.............................................................................................................14

4.3.22 Infinity（无穷）.......................................................................................................14

4.3.23 NaN...........................................................................................................................14

5 记法约定..............................................................................................................................................15

5.1 语法和词法文法.....................................................................................................................15

5.1.1 上下文无关文法(Context-Free Grammars)...............................................................15

5.1.2 词法文法和正则表达式文法.....................................................................................15

5.1.3 数字化字符串文法.....................................................................................................16

5.1.4 语法文法.....................................................................................................................16

5.1.5 文法记法.....................................................................................................................16

5.2 算法约定.................................................................................................................................19

6 源代码文本..........................................................................................................................................21

7 词法约定..............................................................................................................................................22

7.1 Unicode 格式控制字符...........................................................................................................22

7.2 White Space.............................................................................................................................23

7.3 行结束符.................................................................................................................................23

7.4 注释.........................................................................................................................................24

7.5 托肯.........................................................................................................................................25

7.5.1 保留字.........................................................................................................................25

7.5.2 关键字.........................................................................................................................25

7.5.3 未来保留字.................................................................................................................26

7.6 标识符.....................................................................................................................................26

7.7 标点符号.................................................................................................................................27

7.8 常量.........................................................................................................................................28

7.8.1 空值常量.....................................................................................................................28

7.8.3 布尔值常量.................................................................................................................28

7.8.3 数值常量.....................................................................................................................28

7.8.4 字符串常量.................................................................................................................31

7.8.5 正则表达式常量.........................................................................................................33

7.9 自动分号插入.........................................................................................................................34

7.9.1 自动分号插入的规则.................................................................................................34

7.9.2 自动分号插入的例子.................................................................................................35

8 类型......................................................................................................................................................38

8.1 未定义类型.............................................................................................................................38

8.2 空值类型.................................................................................................................................38

8.3 布尔值类型.............................................................................................................................38

8.4 字符串类型.............................................................................................................................38

8.5 数值类型.................................................................................................................................39

8.6 对象类型.................................................................................................................................40

8.6.1 属性的特征.................................................................................................................40

8.6.2 内部属性和方法.........................................................................................................40

8.6.2.1 [[Get]](P)..................................................................................................................42

8.6.22 [[Put]](P,V)................................................................................................................42

8.6.2.3 [[CanPut]](P)............................................................................................................42

8.6.2.4 [[HasProperty]](P)....................................................................................................43

8.6.2.5 [[Delete]](P).............................................................................................................43

8.6.2.6 [[DefaultValue]](hint)...............................................................................................43

8.7 引用类型.................................................................................................................................44

8.7.1 GetValue(V)................................................................................................................44

8.8 列表类型.................................................................................................................................45

8.9 完结类型.................................................................................................................................45

9 类型转换..............................................................................................................................................46

9.1 ToPrimitive..............................................................................................................................46

9.2 ToBoolean................................................................................................................................46

9.3 ToNumber................................................................................................................................47

9.3.1 对字符串类型应用 ToNumber .................................................................................47

9.4 ToInteger..................................................................................................................................50

9.5 ToInt32：（32 位有符号整数）............................................................................................51

9.6 ToUint32：（32 位无符号整数）.........................................................................................51

9.6 ToUint16：（16 位无符号整数）.........................................................................................51

9.8 ToString...................................................................................................................................52

9.8.1 对数值类型应用 ToString..........................................................................................52

9.8 ToObject..................................................................................................................................53

10 执行上下文........................................................................................................................................55

10.1 定义.......................................................................................................................................55

10.1.1 函数对象...................................................................................................................55

10.1.2 可执行代码的类型...................................................................................................55

10.1.3 变量实例化...............................................................................................................55

10.1.4 作用域链和标识符判定...........................................................................................56

10.1.5 全局对象...................................................................................................................56

10.1.6 活动对象...................................................................................................................57

10.1.7 This............................................................................................................................57

10.1.8 参数对象...................................................................................................................57

10.2 进入执行上下文...................................................................................................................58

10.2.1 全局代码...................................................................................................................58

10.2.2 求值代码...................................................................................................................58

10.2.3 函数代码...................................................................................................................58

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