javascript - Is there a way to cancel requestAnimationFrame without a global variable? -

i'm trying cancel requestanimationframe loop, can't because each time requestanimationframe called, new timer id returned, have access return value of first call requestanimationframe.
specifically, code this, don't think entirely uncommon:

function animate(elem) {    var step = function (timestamp) {      //do stuff here.     if (progressedtime < totaltime) {       return requestanimationframe(step); //this return value seems useless.     }    };    return requestanimationframe(step);  }  //elsewhere in code, not in global namespace. var timerid = animate(elem);  //a second or 2 later, before animation over. cancelanimationframe(timerid); //doesn't work! 

because subsequent calls requestanimationframe within step function, don't have access returned timer id in event want call cancelanimationframe.

looking @ way mozilla (and apparently others it), looks declare global variable in code (myreq in mozilla code), , assign return value of each call requestanimationframe variable can used time cancelanimationframe.

is there way without declaring global variable?
thank you.

it doesn't need global variable; needs have scope such both animate , cancel can access it. i.e. can encapsulate it. example, this:

var animation = function(elem) {   var timerid;   var step = function() {     // ...     timerid = requestanimationframe(step);   };   return {     start: function() {       timerid = requestanimationframe(step);     }     cancel: function() {       cancelanimationframe(timerid);     }   }; })();  var animation = new animation(elem); animation.start(); animation.cancel(); timerid; // error, not global. 

edit: don't need code every time - that's why doing programming, after all, abstract stuff repeats don't need ourselves. :)

var animation = function(step) {   var timerid;   var innerstep = function(timestamp) {     step(timestamp);     timerid = requestanimationframe(innerstep);   };   return {     start: function() {       timerid = requestanimationframe(innerstep);     }     cancel: function() {       cancelanimationframe(timerid);     }   }; })(); var animation1 = new animation(function(timestamp) {   // elem1 }); var animation2 = new animation(function(timestamp) {   // elem2 });