javascript - How to call the defaults method of parent model in backbone -


i have created parentmodel , few other models extend parentmodel. each childmodel has additional properties parentmodel.

i want call defaults method of parentmodel , json , add additional properties , return modified object defaults of childmodel.

here code:

var parentmodel = backbone.model.extend({   defaults: function() {     return {       name: '',       description: '',       ruletype: '',       creationdate: ''     };   } });  var childmodel = parentmodel.extend({   defaults: function() {     //q: how defaults parentmodel , add 1 more property json   } });  var c = new childmodel({});

but unable figure out how call defaults method of class extending (parentmodel) ?

_.extend({extraprops:here}, parentmodel.prototype.defaults)


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