You can access the properties of javascript object using the index i.e.
var obj = {
name: 'js',
age: 20
};
var isSame = (obj["name"] == obj.name)
alert(isSame);
var nameIndex = "name"; // Now you can use nameIndex as an indexor of obj to get the value of property name.
isSame = (obj[nameIndex] == obj.name)
Check example@ : http://www.jsfiddle.net/W8EAr/