将原始数据转化成二维数组，根据二维数组的值对二维数组加一以及进一操作，最终得到组合的结果
const skuList = [
['red', 'green', 'black'],
['small', 'big'],
[12, 25, 54, 56],
['12g', '25g', '2g', '8g']
]
function combineProduct (sku) {
let skuT = [[]]
const arr = sku.map(col => {
skuT[0].push(col[0])
return col.length - 1
})
const l = arr.length
let o = Array.from({length: l}).fill(0)
const sum = arr.reduce((total, currentValue) => {
return total * (currentValue + 1)
}, 1)
let count = skuT.length
while(sum !== count) {
let begin = true
let j = l - 1
while (begin) {
if (j < 0) {
begin = false
break
}
if (o[j] < arr[j]) {
o[j] += 1
begin = false
} else {
o[j] = 0
j--
}
}
count++
skuT[count - 1] = []
o.forEach((col, index) => {
skuT[count - 1].push(sku[index][col])
})
}
return skuT
}
console.time('渲染时间：')
const a = combineProduct(skuList)
console.timeEnd('渲染时间：')
console.log(a)
