我有一些格式如下的JSON数据：
[ {"stage1" : [{
"checkpoints" :
[
{
"id" : "checkpoint1",
"name" : "a checkpoint name 1",
"purpose" : "a string about the purpose here",
},
{
"id" : "checkpoint2",
"name" : "a checkpoint name 2",
"purpose" : "a string about the purpose here",
}
],
"stages" :
[
{
"id" : "an id here",
"name" : "a checkpoint name 1",
"purpose" : "a string about the purpose here yah",
}
]
}
]},
{"stage2" : [{
"checkpoints" :
[
{
"id" : "checkpoint1",
"name" : "a checkpoint name 1",
"purpose" : "a string about the purpose here",
},
{
"id" : "checkpoint2",
"name" : "a checkpoint name 2",
"purpose" : "a string about the purpose here",
}
],
"stages" :
[
{
"id" : "an id here",
"name" : "a checkpoint name 1",
"purpose" : "a string about the purpose here yah",
}
]
}
]},
{"stage3" : [{
"checkpoints" :
[
{
"id" : "checkpoint1",
"name" : "a checkpoint name 1",
"purpose" : "a string about the purpose here",
},
{
"id" : "checkpoint2",
"name" : "a checkpoint name 2",
"purpose" : "a string about the purpose here",
}
],
"stages" :
[
{
"id" : "an id here",
"name" : "a checkpoint name 1",
"purpose" : "a string about the purpose here yah",
}
]
}
]},
]
目前我必须引用这样的数据才能进入某个阶段：
alert(data[0].stage1[0].checkpoints.length);
要获得第2阶段的数据，我必须这样做：
alert(data[1].stage2[0].checkpoints.length);
我希望能够做的只是使用阶段名称来访问数据，而无需在'data'声明后指定索引：
alert(data.stagex[0].checkpoints.length);
我不想在数据部分之后声明索引。如何重构我的JSON以便我可以使用阶段名称来获取我需要的数据而无需首先指定索引？
答案 0 :(得分：3)
不要将Stage1，Stage2放入数组中。它们可以直接作为键访问