[Json+jQuery]用jQuery遍历Json

Question

 var people = { "programmers":[  { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa"}, 　　
                                        { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" },　　
                                        { "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }], 　　
                           "authors":[  { "firstName": "Isaac", "lastName": "Asimov", "email": "science fiction" }, 　　
                                        { "firstName": "Tad", "lastName": "Williams", "email": "fantasy" },
                                        { "firstName": "Frank", "lastName": "Peretti", "email": "christian fiction" }], 　　
                         "musicians":[  { "firstName": "Eric", "lastName": "Clapton", "email": "guitar" },
                                        { "firstName": "Sergei", "lastName": "Rachmaninoff", "email": "piano" },
                                        { "firstName": "Ranen", "lastName": "Tong", "email": "Ranen" }] 
                     }只需遍历显示9个firstName的值就行，

Answer 1

       $("#btnEachJson").click(function(){
            $.each(people,function(index,value){
                $.each(value,function(index2,value2){
                    //只能进来3次，何解？必须用jQuery
                });
            });  
       });

Answer 2

  $.each(people,function(index,value){
                $.each(value,function(index2,value2){
                     alert(value2.firstName);
                });
            });你这样不就都拿出来了吗 ？

Answer 3

自己有点晕了，一直用people[index1][index2].firstName，总是找不出来，谢谢楼上，