javascript setInterval is slow in ie8 -

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1) chrome, firefox fine slow in ie8

2) slow after browser zoom in/out, resize, etc

3) why? memory leak? or ?

function movex(object, coord){     var v = (coord < 0) ? -1 : 1;      var timer = setinterval(function(){         var x = object.offsetleft + v;         v *= 2;          if((v < 0 && x > coord) || (v > 0 && x < coord))             object.style.left = x + "px";         else{             clearinterval(timer);             object.style.left = coord + "px";         }     }, 25); }

first off, mentioned in comments, make sure multiple timers aren’t running @ same time. next, not forcing offsetleft calculated each time offer quite speedup.

function movex(object, coord) {     var v = coord < 0 ? -1 : 1;     var x = object.offsetleft;      var timer = setinterval(function () {         x += v;         v *= 2;          if ((v < 0 && x > coord) || (v > 0 && x < coord)) {             object.style.left = x + "px";         } else {             clearinterval(timer);             object.style.left = coord + "px";         }     }, 25); }

also, motion dependant on how long takes timer tick; performance differences might able smoothed on using time exclusively (though can’t correctly in ie 8; there’s no monotonic timer api):

function movex(object, coord) {     var v = coord < 0 ? -1 : 1;     var startx = object.offsetleft;     var start = new date().gettime();      var timer = setinterval(function () {         var t = new date() - start;         var x = startx + v * math.pow(2, t / 25);          if ((v < 0 && x > coord) || (v > 0 && x < coord)) {             object.style.left = x + "px";         } else {             clearinterval(timer);             object.style.left = coord + "px";         }     }, 25); }

that come @ cost of real performance, though.


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