No Block-Level Scopes

JavaScript has no block-level scopes.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
            
        if (true) { 
           var color = "blue"; 
        } 
        document.writeln(color); //"blue" 
        
        for (var i = 0; i < 10; i++){ 
           document.writeln(i); 
        } 
        document.writeln(i); //10 

       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo

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