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关于this

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title>Untitled Document</title>
        <script type="text/javascript">
        var a={
            af:function(){
                console.log(this);
            },
            b:{
                bb:function(){
                    console.log(this);
                }

            },
            c:{
                cc:{
                    cccf:function(){
                        console.log(this);
                    }
                }
            }
        }
        a.b.bb();//这里this指向的时b
        a.b.bb.call(Window);//this指向的是Window
        a.b.bb.call(a);//this指向的时a
        
        </script>
    </head>
    
    <body>
    </body>
</html>