最近遇到这个问题，需要每隔n个将数组分开进行操作，开始想想觉得很简单，结果楞是废了一会儿功夫才实现，感觉最近业务逻辑写少了，脑子也不太转得动了，方法一是我当时写的，后来发现其实很简单（捂脸），此处做个记录...

方法一：

function cutArray (array, subLength) {
    let count = 1;
    let newArr = [];
    let resultArr = [];
    array.forEach(function (item) {
        newArr.push(item);
        if (count % subLength == 0) {
            resultArr.push(newArr);
            newArr = [];
        }
        if (count == array.length - 1) {
            resultArr.push(newArr);
        }
        count++;
    });
    return resultArr;
}

let array= [1,2,3,4,5,6,7,8,9,10,11,12,13,14];
let subArray = cutArray(array, 5);
console.log(subArray );

方法二：

function cutArray(array, subLength) {
    let index = 0;
    let newArr = [];
    while(index < array.length) {
        newArr.push(array.slice(index, index += subLength));
    }
    return newArr;
}

let array= [1,2,3,4,5,6,7,8,9,10,11,12,13,14];
let subArray= cutArray(array, 5);
console.log(subArray);