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Using variables in function

I am learning javascript and i use jquery framework for some learning... please can someone explain to me how to use this sample to alert byebye instead of hello

better question will be how to change var msg in function change

var msg = 'hello';
function change() {
msg = 'byebye';
}
alert(msg);​

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lang-js

AltStyle によって変換されたページ (->オリジナル) /