var name  = "Window Variable";
var obj = {
	name : 'Object Property',
	getName: function() {
		return function() {
			return this.name;
		};
	}
};
obj.getName()();   // "Window Variable"
// The above is not correct, coz in getName() there is no 'name'
// property, so extend to Global variable 'name'.

// 2. use call(), apply() to use 'obj' instead of 'window':
obj.getName().apply(obj);  // "Object Property"
obj.getName().call(obj);  // "Object Property"

// 3. And use intermediate variable 'that' to remain
// it is accessible in the function range:
var obj1 = {
	name : 'Object Property',
	getName: function() {
		var that = this;
		return function() {
			return that.name;
		};
	}
};
obj1.getName()() //"Object Property"