Core JavaScript 1.5 Guide:JavaScript 概览

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[编辑] JavaScript 与 ECMA 脚本术语

The ECMAScript specification uses terminology and syntax that may be unfamiliar to a JavaScript programmer. Although the description of the language may differ in ECMAScript, the language itself remains the same. JavaScript supports all functionality outlined in the ECMAScript specification.

The JavaScript documentation describes aspects of the language that are appropriate for a JavaScript programmer. For example:

• The Global Object is not discussed in the JavaScript documentation because you do not use it directly. The methods and properties of the Global Object, which you do use, are discussed in the JavaScript documentation but are called top-level functions and properties.
• The no parameter (zero-argument) constructor with the Number and String objects is not discussed in the JavaScript documentation, because what is generated is of little use. A Number constructor without an argument returns +0, and a String constructor without an argument returns "" (an empty string).