Javascript/onClick()

解説クリックアクション

sample1

sample1code

function plus(result){
  result.value++;
}
function minus(result){
  result.value--;
  if(result.value < 0){
  	result.value = 0;
  }
}

sample2

s2p

sample2code

var s2p = document.getElementById("s2p");
var x = 20;
s2p.style.fontSize = x + "px";
function s2Func01(){
  x -= 2;
  s2p.style.fontSize = x + "px";
}
function s2Func02(){
  x += 2;
  s2p.style.fontSize = x + "px";
}