crafty_step.js

                 // something similar to this
                 var lt = Date.now();
                 var step = function() { var nt = Date.now(); var dt = nt-lt; lt = nt; Crafty.trigger("Step", dt/1000); }
                 Crafty.bind("EnterFrame",  step);
                 
                 Crafty.bind("Step", function(dt) { /* Do Stuff Here */ });