script onclick 중첩시 부모것 먼저 실행 안되도록 처리

<div onclick="alert('1');">
<div onclick="alert('2');">2</div>
<div onclick="alert('3');">3</div>
</div>

2를 클릭시 1출력 후 2가 출력됨

<div onclick="alert('1');">
<div onclick="if(event.stopPropagation){event.stopPropagation();}event.cancelBubble=true; alert('2');">2</div>
<div onclick="alert('3');">3</div>

</div>

2만 출력하게 하고 싶은 경우

if(event.stopPropagation){event.stopPropagation();}event.cancelBubble=true;