javascriptのpropertyIs Enumerableの方法使用紹介

 
/* 
propertyIsEnumerable()                ,      ,  true,    false. 
1.           ,       . 
2.           ,         ,    for..in     . 
          ,    true; 
*/ 
function MyObject() { 
this.name = "       "; 
} 
var obj = new MyObject(); 
alert(obj.propertyIsEnumerable("name"));//true 
MyObject.prototype.say = "       "; 
alert(obj.propertyIsEnumerable("say")); //false 
for (var i in obj) { 
alert(i);//name,age 
}