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<!DOCTYPE html>
<html>
<head>
<script src="http://zeptojs.com/zepto.min.js"></script>
<script src="http://documentcloud.github.io/underscore/underscore-min.js"></script>
<script src="http://documentcloud.github.io/backbone/backbone-min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
</body>
</html>
 
////////////////////////////
// Using Backbone.js
//
var Vehicle = Backbone.Model.extend({
  prop1: 1
});
var v1 = new Vehicle();
var v2 = new Vehicle();
v1.prop1 = "changed";
console.log(v1.prop1);
console.log(v2.prop1);
////////////////////////////
// Using Classic Javascript
//
var Class1 = function() {
  this.prop1 = 1;
}
var obj1 = new Class1();
var obj2 = new Class1();
obj1.prop1 = "changed";
console.log(obj1.prop1);
console.log(obj2.prop1);
Output

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