Determines whether an object has a property with the specified name.
Syntax
object.hasOwnProperty(proName)
Parameters
object
Required. Instance of an object.
proName
Required. String value of a property name.
Remarks
The hasOwnProperty method returns true if object has a property of the specified name, false if it does not. This method does not check the properties in the object's prototype chain; the property must be a member of the object itself.
This property is not supported on host objects for Internet Explorer 8 and below.
Example
In the following example, all String objects share a common split method. The following code will display false and true.
var s = new String("Sample");
document.write(s.hasOwnProperty("split"));
document.write("<br/>");
document.write(String.prototype.hasOwnProperty("split"));
// Output:
// false
// true
Requirements
Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported Store apps (Windows 8 and Windows Phone 8.1). See Version Information.