JavaScript Number constructor attribute

该ConstructorProperties return a reference to the prototype function that created the example.

For JavaScript Numbers, the constructor property returnsFunction Number(){[native code]}.

For JavaScript Date, the constructor property returnsFunction Date(){[native code]}.

For JavaScript Boolean, the constructor property returnsFunction Boolean(){[native code]}.

For JavaScript Array, the constructor property returnsFunction Array(){[native code]}.

For JavaScript String, the constructor property returnsFunction String(){[native code]}.

Syntax:

number.constructor

Example

var num =　20;
num.constructor;

All browsers fully support the Constructor property:

Properties
constructor	Yes	Yes	Yes	Yes	Yes

Return Value:	Returns the function that created the object instance, that isFunction Number(){[native code]}
JavaScript Version:	ECMAScript 1