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Backbone.JS PreviousAttributes()

The Backbone.JS PreviousAttributes() model is used to get the state of all the attributes prior to the last change event.

Syntax:

Model.PreviousAttributes ()   

Example:

<!DOCTYPE html>  
<html>
<head>  
<title>Example</title>  
<script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>  
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" 
type="text/javascript"></script>  
<script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" 
type="text/javascript"></script>  
</head>  
<body>  
<script type="text/javascript">  
var X = new Backbone.Model({  
msg1: "HELLO WORLD.",  
msg2: "Welcome."  
});  
X.set('msg1', 'Hello World.');  
document.write("All the previous attributes of the model X before the change are: ");  
document.write("<br>");  
document.write(JSON.stringify(X.previousAttributes()));  
</script>  
</body>  
</html>

Output:

All the previous attributes of the model X before the change are: 
{"msg1":"HELLO WORLD.","msg2":"Welcome."}

Explanation:
In the above example, all the previous attributes of the model X before the change are returned as the output.

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