'hasOwnProperty()' Example
<html>
<body>
<script language="javascript">
function Object(firstName, lastName){
this.firstName = firstName;
this.lastName = lastName;
}
function function1(){
myObject.age = 34;
alert(myObject.age());
}
function function2(){
myObject.favoriteColor = 'Blue';
alert(myObject.favoriteColor);
}
var myObject = new Object('first name', 'last name');
</script>
<button onclick="function2();">Add property</button>
<button onclick="function1();">Add method</button>
<button onclick="alert(myObject.constructor);">Constructor</button>
<button onclick="alert(myObject.isPrototypeOf(myObject));">PrototypeOf</button>
<button onclick="alert(myObject.hasOwnProperty('lastName'));">HasProperty</button>
</body>
</html>
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