Backbone.JS Previous()

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The Backbone.JS Previous() model is used to determine the previous value of the changed attribute of a model.

Syntax: 

Model.Previous (attributes)

Parameters:
attributes: This parameter is used to specify the properties of a model.

Example: 

  

  
Example

Output: 

Value of msg1 after set: {"msg1":"Hello World."}
Previous value of msg1: HELLO WORLD.

Explanation:
In the above example, the msg1 vale has changed and thus the previous value is determined along with the changed value.