【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>