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How can the KEY in this data format be changed at will, dynamic or not? You only need to know the key to get the value

Object.keys can get the array composed of object keys, and then you get the first one

Object is a mapping relationship, there is no concept of order. The picture you posted is just console.log in dictionary order

var paramOne = "2017"
acceptDate[paramOne]

Dynamics are the way to get them. In the final analysis, you need to have corresponding indexes.

acceptDate[0][0][0]

I have used a similar method on keys in lodash

http://lodash.think2011.net/keys