【JavaScript】JS中没有代码块的概念

    <script>
        
        var m = "roboce";
        if(m === "roboce"){
            var k = "haha";
        }
        
        var a = function() {
            var aa = "aa";
        }
        
        function f1() {
            var bb = "bb";
        }
        console.log(k); // haha
        console.log(aa); // undefined
        console.log(bb); // undefined
    </script>