lovecoding
/
web0331


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 全局作用域
        var a = 10;
        function fn1() {
            console.log(a,'打印')
            // 局部作用域
            var b = 3;
            console.log(b,'12b')
        }
        fn1()
        console.log(b,'b')
    </script>
</body>
</html>