javascript 随笔--类型

4.3.19

Number value

primitive value corresponding to a double-precision 64-bit binary format IEEE 754 value

NOTE A Number value is a member of the Number type and is a direct representation of a number.

4.3.20

Number type

set of all possible Number values including the special ―Not-a-Number‖ (NaN) values, positive infinity, and negative infinity

4.3.21

Number object

member of the Object type that is an instance of the standard built-in Number constructor

NOTE A Number object is created by using the Number constructor in a new expression, supplying a Number value as an argument. The resulting object has an internal property whose value is the Number value. A Number object can be coerced to a Number value by calling the Number constructor as a function (15.7.1).

 

http://izs.me/v8-docs/hierarchy.html  v8引擎文档

 http://club.cnodejs.org/topic/4f16442ccae1f4aa270010c1 一篇关于v8与js的文章