sample: random increment variable

by sii_side

HTML

<button>0</button>

JavaScript

var cnt = 0;

$("button").on("click", function() {
	var tmp = cnt;
 
  var rnd = Math.random();
  if(rnd < 0.5) {
    cnt++;
  }
  
  if(cnt === tmp) {
  	window.alert("not increment");
  } else {
  	$(this).text(cnt);
  }
});