javascript - Combining string with JSON object to return the data -

I have a JSON object that I need to get a price from.

This is the object reference that works ... I want to get the data.

dataJSON.companies [0] .fields.Internet.length

What do I need to do to somehow evaluate the object with a string variable . Something like this ...

  var mediaType = 'Internet'; DataJSON.companies [0] .fields + MediaType + .length;  

Is there any way to do this? I've been stumped.

When you do not know the name of the property till runtime.

var mediaType = 'Internet'; DataJSON.companies [0] .field [media type]. Length;

You can access the members of the object either with dot notation or square bracket notation.

For example

  var results = myobject.propertname;  

or

var results = myobject ["propertyname"];