維克的煩惱

1 Scope

This Standard defines the ECMAScript scripting language.

 

ECMAScript 語言規範

1. 範圍

    此份標準定義了ECMAScript描述語言。

 

2 Conformance

A conforming implementation of ECMAScript must provide and support all the types, values, objects, properties, functions, and program syntax and semantics described in this specification.

A conforming implementation of this Standard shall interpret characters in conformance with the Unicode Standard, Version 3.0 or later and ISO/IEC 10646-1 with either UCS-2 or UTF-16 as the adopted encoding form, implementation level 3. If the adopted ISO/IEC 10646-1 subset is not otherwise specified, it is presumed to be the BMP subset, collection 300. If the adopted encoding form is not otherwise specified, it presumed to be the UTF-16 encoding form.

A conforming implementation of ECMAScript is permitted to provide additional types, values, objects, properties, and functions beyond those described in this specification. In particular, a conforming implementation of ECMAScript is permitted to provide properties not described in this specification, and values for those properties, for objects that are described in this specification.

A conforming implementation of ECMAScript is permitted to support program and regular expression syntax not described in this specification. In particular, a conforming implementation of ECMAScript is permitted to support program syntax that makes use of the "future reserved words"  listed in 7.6.1.2 of this specification.

 

 

2.一致性

一個符合ECMAScript的介面，必須提供並支援在此規範書中所描述的所有類型、值、物件、屬性、函式，和程式語法與語意。

一個符合此份標準的介面，必須要能解釋符合下面的字符集：Unicode標準第三版或其後的版本，以及採用UCS-2或是UTF-16編碼表的通用字符集(ISO/IEC 10646-1)的第三級實現級別。假如沒有額外指定採用的通用字符集(ISO/IEC 10646-1)的子集，將被認定是BMP子集,collection 300。如果採用的編碼表沒有額外指明，將被認定為是UTF-16編碼表。

一個符合ECMAScript的介面，是被允許提供此份規範所描述之外，額外的類型、值、物件、屬性與函式。特別一提，一個符合ECMAScript的介面是被允許為此規範所描述的物件提供不在此規範提到的、額外的屬性和賦予該屬性的值。

一個符合ECMAScript的介面是被允許支援不在此規範中提到的程式及正規表達式語法。特別一提，一個符合ECMAScript的介面是被允許支援利用"未來保留字"的程式語法，這些未來保留字定義在此規範的列表7.6.1.2中。