<script type="text/javascript" >
(function(){
i=10;
function aa(){
i=2;
}
aa();
alert(i);
})();
(function(){
i=10;
function aa(){
var i=2;
}
aa();
alert(i);
})();
</script>
原文:http://www.blogjava.net/yangjunwei/archive/2016/04/29/430301.html