js遇到这样基础题，看你能不能作对呢

 var a = (function() {
         return typeof arguments;
      })();
      alert(a); //Object

         var b = (function(x) {
             delete x;
             return x;
         })();
         alert(b); //undefined
     //**********************
     var f = function g() {
         return 23;
         typeof g();
     }
     alert(f); //function。。。。
     //********************************
     var y=1, x = y = typeof x;
     x;
     alert(x);//undefined
     alert(x = y = typeof x);//string
     //********************************
     var g = (function f(f) {
         return typeof f();
     })(function() {
         return 1;
     });
     alert(g); //number

     //**************************************
     var foo = {

         bar: function() {
             return this.baz;},
             baz: 1
     };
     var g = (function() {
         return typeof arguments[0]();
     })(foo.bar);
     alert(g); //undefined

     //****************
   var foo = {
     bar: function(){ return this.baz; },
     baz: 1
   }
   alert(typeof (f = foo.bar)());

     //*********************************************
   var f = (function f(){ return "1"; }, function g(){ return 2; })();
   alert(typeof f); //number

   var x = 1;
   if (function f(){}) {

     x += typeof f;
     alert(x);
   }
   alert(x); //1number

   //alert(function g() {});

     //****************************************
     function f() {
         return f;
     }
     alert(new f() instanceof f); //false
     //*****************************************
     var g = (function f(){
     function f(){ return 1; }
     return f();
     function f(){ return 2; }
   })();

   alert(g); //
   //********************************************

   var k = (function(foo){
     return typeof foo.bar;
   })({ foo: { bar: 1 } });
   alert(k); //undefined
     //******************************************
   var x = [typeof x, typeof y][1];
     alert(typeof typeof typeof x); //string
    //******************************************
      with (function(x, undefined){})
      alert(length); //
       */

       var j = (function(x){
     delete x;
     return x;
   })(1);
   alert(j); //

转自：http://perfectionkills.com/javascript-quiz