从对象列表中获取数据的最有效方法？

Question

我有这样的对象列表（从PHP，然后JSON编码创建）：

{"10":{"10":["4","7","2","2","0","32"],"11":["5","22","1","1","0","0"]}} 

translated: 

{"X":{"Y":["unique_id","data","data","data","data","data"],"Y":["unique_id","data","data","data","data","data"] 

但是我试图找到一种方式来获得X：通过寻找UNIQUE_IDŸ可以说这是4。

什么是最有效的方法来做到这一点？

Answer 1

如果它们是唯一的ID，请创建一个单独的查找表。

var id_lookup = {}; 

for(var x in data) 
    for(var y in data[x]) 
     id_lookup[data[x][y][0]] = [x,y] 

var coords = id_lookup[4]; 

alert(coords); // [10,10] 

alert(data[coords[0]][coords[1]]); // ["4","7","2","2","0","32"] 

DEMO：http://jsfiddle.net/LXE3B/