请各位大佬指点！JS把数组重新分组?

Question

假设一个数组长这样
varqq=[
{
"group":100,
"info":{"event":123},
"main":true,
},
{
"group":100,
"info":{"event":323},
"main":false,
"sp":12
},
{
"group":103,
"info":{"event":123},
"main":true,
"sp":13,
},
{
"group":103,
"info":{"event":323},
"main":false,
"sp":10
},
{
"group":103,
"info":{"event":123},
"main":false,
"sp":1
}
];
group是同数字表示是一组的，我想要把同一组的放在一起，還有一個特殊情况，sp===1的话，就把它放到前一个阵列的最后一个位置
也就是最后输出要这样
varqq=[
[
{
"group":100,
"info":{"event":123},
"main":true,
},
{
"group":100,
"info":{"event":323},
"main":false,
"sp":12
},
{
"group":103,
"info":{"event":123},
"main":false,
"sp":1
}
],
[
{
"group":103,
"info":{"event":123},
"main":true,
"sp":13,
},
{
"group":103,
"info":{"event":323},
"main":false,
"sp":10
}
]
];
这样具体该怎么实现?