custom-scoped-setInterval-JavaScript.js: intervalCall binds a function to a declared scope and invokes it after 'tm' milliseconds

custom-scoped-setInterval-JavaScript.js

//lsauer.com, 2012 lo sauer
//description: intervalCall binds a function to a declared scope and invokes it after 'tm' milliseconds
//@param scope:    scope in which the function should be invoked
//@param fn:       the function to be invoked
//@param tm:       timeout in milliseconds
//[@param fntimes]: Optional. A function to control the number of invocations of 'fn', i.e. to declare events / triggers based on the invocation-count
//                fntimes is passed an integer Number-counter, starting at 1;

function intervalCall(scope, fn, tm, fntimes)
{
  var _fn = (function(){ 
        var _self = scope, _fnset = fn, _cnt = 1, _fntimes = fntimes;
        return function(){ _fnset.call(_self); _fntimes && _fntimes.call(_self, _cnt++)}
      }).call(scope||this);
  return setInterval( _fn, tm);
}

//Examples:
//Example #1
new intervalCall(document, function(){console.log("test", this)}, 200);
//Example #2
var _ifn = doIntervalntimes( function(i){ console.log(i); if(i >= 5){clearInterval(_ifn); } }, function(){console.log("test", this)}, 500, document);