javascript中的this(3)

3. 浏览器行为
这一点我只是顺便看到说ie和ff在绑定事件上的区别（attachEvent、addEventListener）继续看例子：
        c: <input type = "button" id = "c" value = "click me c" />
<script type = "text/javascript" >
var c = document . getElementById ( "c" );
if ( document . attachEvent ) {     // for ie
c . attachEvent ( 'onclick' , clicked );
} else {
c . addEventListener ( 'click' , clicked , false );
}
</script>
       ie下输出undefined, ff下输出click me c， why？ 加点debug信息再看看
        d: <input type = "button" id = "d" value = "click me d" />
<script type = "text/javascript" >
function clicked2 () {
console . log ( this , arguments );
for ( var i = 0 ; i != arguments . length ; ++ i ) {
console . log ( 'arg' , i , ':' , arguments [ i ]);
}
}
var d = document . getElementById ( "d" );
if ( document . attachEvent ) {     // for ie
d . attachEvent ( 'onclick' , clicked2 );
} else {
d . addEventListener ( 'click' , clicked2 , false );
}
</script>
        看到了吧，ie下this成了window，ff则是出发时间的dom。不过两个都会给clicked2传个参数event  

摘自 懒人小何