Backbone.JS PreviousAttributes()

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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: 

  

  
Example

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.