[рони]

MoJlo4HuK,
непонятная проблема...

var objects = [{
 key: 25,
 key2: 33,
 key3: 14
 },{
 key: 25,
 key2: 33,
 key3: 14
 }];

 function rand(n)
 {
    return n * Math.random()|0
 }
 function randObj(arr)
 {
   var num = rand(arr.length);
   var item = arr[num];
   var keysItem = Object.keys(item);
   num = rand(keysItem.length);
   var key = keysItem[num];
   return item[key]
 }
 alert(randObj(objects));