jquery遍历json的方法

json的数据为：{"0":["75","test4","test41","ddd"],"1":["76","test5","test51","ddd"]}

如何获取数组中第三个的数值，即遍历后得到test41和test51的值

JQ:

var j ={"0":["75","test4","test41","ddd"],"1":["76","test5","test51","ddd"]}
var arr= [];
$.each(j,function(i,o){
arr.push(o[2])
})
alert(arr)

JS:

var json = { "0": ["75", "test4", "test41", "ddd"], "1": ["76", "test5", "test51", "ddd"] };
for(k in json ){
alert(json[k][2]);
}