constructor Property
Specifies the function that creates an object.
object.constructor
Arguments
- object
Required. The name of an object or function.
Remarks
The constructor property is a member of the prototype of every object that has a prototype. This includes all intrinsic JScript objects except the arguments, Enumerator, Error, Global, Math, RegExp, Regular Expression, and VBArray objects. The constructor property contains a reference to the function that constructs instances of that particular object.
Class-based objects do not have a constructor property.
Example
The following example illustrates the use of the constructor property.
function testObject(ob)
{
if (ob.constructor == String)
return ("Object is a String.");
else if (ob.constructor == MyFunc)
return ("Object is constructed from MyFunc.");
else
return ("Object is neither a String nor constructed from MyFunc.");
}
// A constructor function.
function MyFunc() {
// Body of function.
}
var x = new String("Hi");
print(testObject(x));
var y = new MyFunc;
print(testObject(y));
The output of this program is:
Object is a String.
Object is constructed from MyFunc.
Requirements
Applies To:
Array Object| Boolean Object| Date Object| Function Object| Number Object| Object Object| String Object