javascript window.onload scope

Posted by teggy on Stack Overflow See other posts from Stack Overflow or by teggy
Published on 2010-05-04T01:02:28Z Indexed on 2010/05/04 1:08 UTC
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Can someone explain why the alert returns "undefined" instead of "hello"?

window.onload = function() {  
    var a = 'hello';  
    alert(window.a);  
}

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