Part 30 supplement (30) ECMAScript object

1、 Reference type

Reference types are often called classes （class）, in other words , Encountered reference value , What we're dealing with is objects .

The object is new Operator plus the name of the object to be instantiated . for example , The following code creates Object Instance of object ：

var f = new Object()

If there are no parameters , Brackets can be omitted ：

var f = new Object

• Although parentheses are not required , But it is better to use parentheses ;

2、Object object

• CMAScript All objects in are inherited from this object ;
• Object All properties and methods in the object appear in other objects ;

Object Object has the following properties ：

constructor

Reference to the function that created the object （ The pointer ）. about Object object , The pointer points to the original Object() function .

Prototype

A reference to the object prototype of the object . For all objects , It returns... By default Object An instance of an object .

Object Object also has several methods ：

hasOwnProperty(property)

Determine whether an object has a specific attribute . have to