使用AJAX解析JSON

I am trying to parse a JSON result with AJAX.

My JSON looks like this

[{
        "_id" : "54fb09b7d059bdf3107f9486",
        "lastName" : "Record",
        "firstName" : "First",
        "__v" : 0
    }, {
        "_id" : "54fb0a2fd059bdf3107f9487",
        "lastName" : "Record",
        "firstName" : "First",
        "__v" : 0
    }
]

I call this in Javascript

$.getJSON('api/people', function(data) {
       item3="+data.item3+"</p>");


  $.each(data,function(i,j){
    content ='<span>'+j[i].firstName+'<br />'+j[i].lastName+'<br /></span>';
  });
        alert(content);
  });

Unfortunately I get "Uncaught TypeError: Cannot read property 'firstName' of undefined" in the console.

Can someone please tell me how to properly parse this JSON?

jQuery.each's second argument (the function executed for each element) takes two arguments (in your example, i and j), the first representing the key and the second the value, so there's no need for j[i].

This should work:

$.getJSON('api/people', function(data) {
  $.each(data,function(i, item){
    content ='<span>'+item.firstName+'<br />'+item.lastName+'<br /></span>';
  });
  alert(content);
});