javascript - nodejs execute string variable -

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I am using sails.js. 1) I want to print 'Dolphin' with the object matching call. 

  var matchCol = {'card': {'add': {'voo': 'dolphin'}}}; Module.exports = {methodA: function (Rick, Race) {var a = 'card'; Var B = 'Ed'; Var c = 'voo'; Return res.send (matchCol.a.b.c); },};

2) If I want to declare the object and want to parse the key 'foo', then how can I do it? 

  var key = 'foo'; Var params = {key: 'some'};

Please help. In Javascript, if you have a variable that represents the property name of an object, you can access it by entering the < To use square brackets you can: 

  return res.send (matchcol [a] [b] [c]);

You can also use square brackets for assignments: 

  var key = 'foo'; Var Params = {}; Consultation [key] = 'anything';

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