js 兼容阻止事件冒泡stopPropagation

function stopPropagation(e){
	e=window.event||e;
	if(document.all){
		e.cancelBubble=true;
	}else{
		e.stopPropagation();
	}
}
用法：
document.getElementsByTagName("li")[0].onclick=function(e){
	alert("li");
	stopPropagation(e);
}