node.js - javascript setter injection without eval -

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I am trying to use a setter injection in this example below, it works, but I have yet to It can not know how to achieve the same result without using Eval (). 

  var action = function () {}; Action.prototype.create = function (type, name) {var action = eval ("this." + Type); Action.create (name); }; Action.prototype.review = {create: function (name) {console.log ("hey" + name); }}; Var bang = new action (); Bang.create ('review', 'john');   
 I'm running it on nodejs v0.10   
 
 
 In that context,  eval ("this." + Type)   should be equal to [type] .  
 This is one.

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