var i=1;
function changeColor(bg,num){
box.style.color=bg;
box.innerHTML=(iPP)*num;
}
btn1.onclick=function(){
changeColor("red",1);
}
btn2.onclick=function(){
changeColor("green",2);
}
btn3.onclick=function(){
changeColor("yellow",3);
}//
is not clear enough. If you want the global variable I to be 1 every time, just define it in the changeColor function.
var i=0, color = "";
function changeColor(bg,num){
if(color !== bg) {
i = 0;
color = bg;
box.style.color=bg;
}//0
box.innerHTML=(iPP)*num;
}
btn1.onclick=function(){
changeColor("red",1);
}
btn2.onclick=function(){
changeColor("green",2);
}
btn3.onclick=function(){
changeColor("yellow",3);
}//reset when clicked
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