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<!DOCTYPE html> <html> <body> <h1>Demo: Global scope</h1> <script> function createUserName() { userName = "Bill"; }; function modifyUserName() { if(userName) userName = "Steve"; }; function showUserName() { alert(userName); }; createUserName(); showUserName(); // Bill modifyUserName(); showUserName(); // Steve </script> </body> </html>
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