例如：
var giftlist[1490011777] = [];
giftlist[1490011777][‘id‘] = 1490011777;
giftlist[1490011777][‘name‘] = "礼包测试";
giftlist[1490011777][‘desc‘] = "详情";
转换json串
var jsonStr = JSON.stringify(giftlist[1490011777]);
原文：http://www.cnblogs.com/longzhongren/p/6761202.html