做用域面试题

<script type="text/javascript">
  var x = 10;
  function fn() {
    console.log(x);
  }
  function show(f) {
    var x = 20;
    f();
  }
  show(fn);


</script>

<script type="text/javascript">
  var fn = function () {
    console.log(fn)
  }
  fn()

  var obj = {
    fn2: function () {
     console.log(fn2)
     //console.log(this.fn2)
    }
  }
  obj.fn2()
</script>