怎么获取getJSON中的responseJSON？

var data=$.getJSON("url");
console.log(data);
我想获取respnseJSON里面的东西怎么写？

var data=$.getJSON("url");
    var opts = {
            data:data,
            selStyle: 'margin-left: 3px;',
            select: "[name='demo12']",
            dataReader: {id: 'id', name: 'majorname', cell: 'submajor'}
    };       
    console.log(data);
    var linkageSel = new LinkageSel(opts);
    });

---

http://api.jquery.com/jQuery.getJSON/

$.getJSON("url", function(data){
  var opts = {
    data:data,
    selStyle: 'margin-left: 3px;',
    select: "[name='demo12']",
    dataReader: {id: 'id', name: 'majorname', cell: 'submajor'}
  };
  console.log(data);
  var linkageSel = new LinkageSel(opts);
});