B012-变量提升

   console.log('global', i);
    var i = 1;
    foo(1);
    function foo(i) {
      if (i == 4) {
        return
      }
      console.log('foo begin', i);
      foo(i + 1)
      console.log('foo end', i);
    }
    console.log('foo ge', i);

答案


    global undefined
foo begin 1
foo begin 2
foo begin 3
foo end 3
 foo end 2
 foo end 1
 foo ge 1