代码语言：javascript复制
// 自己实现
function chunk(list, size) {
let len = list.length;
if (size < 1 || !len) {
return [];
}
if (size > len) {
return [list];
}
// 最终返回数组
let res = [];
// 向下取整
let integer = Math.floor(len / size);
// 取余
let rest = len % size;
for (let i = 1; i <= integer; i ) {
res.push(list.splice(0, size));
}
if (rest) {
res.push(list.splice(0, rest));
}
return res;
}
// console.log(chunk([1, 2, 3, 4, 5], 0));
console.log(chunk([1, 2, 3, 4, 5], -1));
console.log(chunk([1, 2, 3, 4, 5], 2));
console.log(chunk([1, 2, 3, 4, 5], 3));
console.log(chunk([1, 2, 3, 4, 5], 4));
console.log(chunk([1, 2, 3, 4, 5], 5));
console.log(chunk([1, 2, 3, 4, 5], 6));
// []
// []
// [ [ 1, 2 ], [ 3, 4 ], [ 5 ] ]
// [ [ 1, 2, 3 ], [ 4, 5 ] ]
// [ [ 1, 2, 3, 4 ], [ 5 ] ]
// [ [ 1, 2, 3, 4, 5 ] ]
// [ [ 1, 2, 3, 4, 5 ] ]网上找到的lodash源码（供参考）：
代码语言：javascript复制function chunk(array, size) {
size = Math.max(size, 0)
const length = array == null ? 0 : array.length
if (!length || size < 1) {
return []
}
let index = 0
let resIndex = 0
const result = new Array(Math.ceil(length / size))
while (index < length) {
result[resIndex ] = slice(array, index, (index = size))
}
return result
}
