do
var old = /*value*/
function loop(){
if (/*value*/ != old){ //check if the value is not old
//do stuff
}
old = /*value*/ //set old to value
requestAnimationFrame(loop) //loop every frame
}
requestAnimationFrame(loop) //wait a frame
or
var old = /*value*/
function changed(){
var change = /*value*/ != old //check if the value is not old
old = /*value*/ //set old to value
return change //output change
}
and replace /*value*/ with the value to check :)
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