做

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

或

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
}

并将 /*value*/ 替换为要检查的值:)

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