JS：数组排列组合

1. 原数组

   const source = [
     ['black', 'white', 'red', 'blue'],
     ['128GB', '256GB', '512GB'],
     ['zhengzhou', 'shenzhen', 'vietnam'],
   ]
   

2. 方法

   let temp = []
   let results = []
   
   function combine(arr, index = 0) {
     arr[index].forEach(item => {
       temp[index] = item
   
       index + 1 < arr.length
         ? combine(arr, index + 1)
         : results.push(temp.slice())
     })
   }
   

3. 执行

   combine(source)
   
   console.log(results)
   

4. 输出

   [
     [ 'black', '128GB', 'zhengzhou' ],
     [ 'black', '128GB', 'shenzhen' ],
     [ 'black', '128GB', 'vietnam' ],
     [ 'black', '256GB', 'zhengzhou' ],
     [ 'black', '256GB', 'shenzhen' ],
     [ 'black', '256GB', 'vietnam' ],
     [ 'black', '512GB', 'zhengzhou' ],
     [ 'black', '512GB', 'shenzhen' ],
     [ 'black', '512GB', 'vietnam' ],
     [ 'white', '128GB', 'zhengzhou' ],
     [ 'white', '128GB', 'shenzhen' ],
     [ 'white', '128GB', 'vietnam' ],
     [ 'white', '256GB', 'zhengzhou' ],
     [ 'white', '256GB', 'shenzhen' ],
     [ 'white', '256GB', 'vietnam' ],
     [ 'white', '512GB', 'zhengzhou' ],
     [ 'white', '512GB', 'shenzhen' ],
     [ 'white', '512GB', 'vietnam' ],
     [ 'red', '128GB', 'zhengzhou' ],
     [ 'red', '128GB', 'shenzhen' ],
     [ 'red', '128GB', 'vietnam' ],
     [ 'red', '256GB', 'zhengzhou' ],
     [ 'red', '256GB', 'shenzhen' ],
     [ 'red', '256GB', 'vietnam' ],
     [ 'red', '512GB', 'zhengzhou' ],
     [ 'red', '512GB', 'vietnam' ],
     [ 'blue', '128GB', 'zhengzhou' ],
     [ 'blue', '128GB', 'shenzhen' ],
     [ 'blue', '128GB', 'vietnam' ],
     [ 'blue', '256GB', 'zhengzhou' ],
     [ 'blue', '256GB', 'shenzhen' ],
     [ 'blue', '256GB', 'vietnam' ],
     [ 'blue', '512GB', 'zhengzhou' ],
     [ 'blue', '512GB', 'shenzhen' ],
     [ 'blue', '512GB', 'vietnam' ]
   ]