一个傻问题，为什么JSon的格式2端要带"[]"

Question

我看了网上的格式，到最后，建议的Json格式是这样的：
[{"id":1,"name":"龙王的恐惧","size":"大型","difficult":"史诗","players":8,"dmap":true,"introduce":"我们在哭泣","comment":,"dnum":0},{"id":2,"name":"诸侯","size":"小型","difficult":"普通","players":4,"dmap":false,"introduce":"欢乐女神","comment":,"dnum":0}]为什么呢
那么在JS里又应该如何读取呢？

Answer 1

[]相当于new Array(); 和使用数组一样操作
arr = [{"id":1,"name":"龙王的恐惧","size":"大型","difficult":"史诗","players":8,"dmap":true,"introduce":"我们在哭泣","comment":"x","dnum":0},{"id":2,"name":"诸侯","size":"小型","difficult":"普通","players":4,"dmap":false,"introduce":"欢乐女神","comment":"xxx","dnum":0}]
for(var i=0;i<arr.length;i++){
   alert(arr[i].name)    
}

Answer 2

json对象是用大括号包围的，但是如果是对象数组，当然用方括号了

Answer 3

[]相当于new Array(); 和使用数组一样操作