$.each(data, function(index,el) { returns Uncaught ReferenceError in Framework7 v4

I found several answers but nothing work with v4 version.

I make an ajax function that get data from server. This data is JSON formatted in multidimensionnal arrays. I need to do a $.each(data, function(index,el) {

With $ or $$, I get this error :

Uncaught ReferenceError: $ is not defined

or

Uncaught ReferenceError: $$ is not defined

I tried Framework7 instead of $, but this won't work. How to do a each on an object with F7 v4.0 ?