js 长数组拆分成 3个一组怎么实现具体代码

问个问题 怎么把一个数组查分出来 分组 例如：
var xx = [
{"id": 01, "url": 'http/stat/00041.png'},
{"id": 02, "url": 'http/stat/00042.png'},
{"id": 03, "url": 'http/stat/00043.png'},
{"id": 04, "url": 'http/stat/00044.png'},
{"id": 05, "url": 'http/stat/00045.png'},
{"id": 06, "url": 'http/stat/00046.png'}
];
怎么变成如下格式 3个一组
var cc = [
[
{"id": 01, "url": 'http/stat/00041.png'},
{"id": 02, "url": 'http/stat/00042.png'},
{"id": 03, "url": 'http/stat/00043.png'}
],
[
{"id": 04, "url": 'http/stat/00044.png'},
{"id": 05, "url": 'http/stat/00045.png'},
{"id": 06, "url": 'http/stat/00046.png'}
],
];

测试

onclick="getArr()">测试

var xx = [

{"id": 01, "url": 'http/stat/00041.png'},
{"id": 02, "url": 'http/stat/00042.png'},
{"id": 03, "url": 'http/stat/00043.png'},
{"id": 04, "url": 'http/stat/00044.png'},
{"id": 05, "url": 'http/stat/00045.png'},
{"id": 06, "url": 'http/stat/00046.png'},
{"id": 07, "url": 'http/stat/00044.png'},
{"id": 08, "url": 'http/stat/00045.png'},
{"id": 09, "url": 'http/stat/00045.png'},
{"id": 10, "url": 'http/stat/00046.png'}
];

var cc = [];
var bb = [];
for(var i=0;i<xx.length;i++){
    bb.push(xx[i]);
    if(i%3==2 || (i+1)==xx.length){
        cc.push(bb);
        bb=[];
    }  
}
console.log(cc);

思路：首先新建一个大数组，通过循环遍历，再构造一个小的数组，然后进行数量限制，当小数组数量足够的时候，将其加入到大数组中。

<script>
            var arr = [
            {"id": 01, "url": 'http/stat/00041.png'},
            {"id": 02, "url": 'http/stat/00042.png'},
            {"id": 03, "url": 'http/stat/00043.png'},
            {"id": 04, "url": 'http/stat/00044.png'},
            {"id": 05, "url": 'http/stat/00045.png'},
            {"id": 06, "url": 'http/stat/00046.png'}
            ];
            var result = [];
            var aa = [];
            for(var i = 0;i < arr.length;i++){
            aa.push(arr[i]);
            if((i + 1) % 3 == 0){
            result.push(aa);
            aa = [];
            }
            }
            for(var i=0;i<result.length;i++){
                for(var j=0;j<result[0].length;j++){
                    console.log((result[i])[j]);
                }
            }
        </script>

运行结果：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
        <button onclick="TestOne()">Click me</button>
    <div id="demo">

    </div>
</body>
    <script>
        var test = [
        {id:1,url:'a'},
        {id:2,url:'b'},
        {id:3,url:'c'},
        {id:4,url:'d'},
        {id:5,url:'e'},
        {id:6,url:'f'},
        {id:7,url:'g'},
        {id:8,url:'h'},
        {id:9,url:'i'},
        ];
        let bagList = []; let limtList = [];
        demo = document.getElementById("demo");
       function TestOne(){
           for(let i=0;i<test.length;i++){
            if((i+1)%3 === 0){
                limtList = [];
              for(let j=i-2;j<i+1;j++){
                  limtList.push(test[j]);
              }
              bagList.push(limtList);
          }  
           }
           console.log(bagList);
       }
    </script>
</html>

不知是否满足你的问题，有不懂的可以问我

最简单的方案

var cc = [];
for (var i = 0; i < xx.length; i+=3) {
    cc.push(xx.slice(i, i+3));
}

比较有意思的写法

xx.reduce((lastArr, thisV, index)=>{
  let lIndex = ~~(index/3)
  if(index%3){
      lastArr[lIndex].push(thisV)
  }else{
      lastArr[lIndex] = [thisV] 
  }
  return lastArr
},[])

js 长数组 拆分成 3个一组怎么实现 具体代码

测试

js 长数组拆分成 3个一组怎么实现具体代码