hasOwnProperty的误区

package
{
import flash.display.Sprite;
public class Test extends Sprite
{
private var a : Boolean;
public var b : Boolean;
internal var c:Boolean;
private function test1() : void
{
}
public function test2() : void
{
}

internal function test3():void
{

}
public function Test()
{
super();
trace( this.hasOwnProperty( "a" ));//false
trace( this.hasOwnProperty( "b" ));//true
trace( this.hasOwnProperty( "c" ));//false
trace( this.hasOwnProperty( "test1" ));//false
trace( this.hasOwnProperty( "test2" ));//true
trace( this.hasOwnProperty( "test3" ));//false
}
}
}

hasOwnProperty只能判断public权限的属性和方法是否存在，非public的属性和方法一律都为false，如果没注意这点，很容易导致动态获取属性或方法时程序出现所谓的bug
本文出自 “finali” 博客，请务必保留此出处http://finally.blog.51cto.com/4483057/823444