1. let result = {
    2.   splitSymbol: ''
    3. }
    4. freeCombination([1,2,3,4], result);
    5. function freeCombination(arr, result, before, next) {
    6.   var objectResult = false
    7.   var splitSymbol = '-'
    8.   if (Object.prototype.toString.call(result) === '[object Object]') {
    9.     splitSymbol = result.splitSymbol !== undefined ? result.splitSymbol : '-'
    10.     if (result.list == undefined) {
    11.       result.list = []
    12.     }
    13.     objectResult = true
    14.   }
    15.   if (next) {
    16.     before += `${next}${splitSymbol}`
    17.   }
    18.   if (!before) {
    19.     before = ''
    20.   }
    21.   if (!result) {
    22.     result = []
    23.   }
    24.   arr.forEach((item, index) => {
    25.     if (arr.length > 1) {
    26.       let children = JSON.parse(JSON.stringify(arr));
    27.       children.splice(index, 1)
    28.       freeCombination(children, result, before, item)
    29.     } else {
    30.       objectResult ? result.list.push(before += `${item}${splitSymbol}`) : result.push(before += `${item}${splitSymbol}`)
    31.     }
    32.   })
    33. }
    34. console.log(result)
    1. let suitList  = [[['A_1_1','A_1_2'],"A_2","A_3","A_4","A_5"],[['B_1_1','B_1_2'],"B_2","B_3","B_4","B_5","B_6"], ["C_1","C_2","C_3","C_4","C_5"]];
    2. let result = [];
    3. suitName(suitList,{
    4.   result: []
    5. })
    6. function suitName(arr) {
    7.   let brr = []
    8.   arr.forEach((item, index) => {
    9.     if (typeof item === 'string') {
    10.       if (result) {
    11.         result.forEach(a => {
    12.           brr.push(`${a},${item}`)
    13.         })
    14.       } else {
    15.         brr.push(`${item}`)
    16.       }
    17.       if (index === arr.length - 1) {
    18.         result = brr;
    19.       }
    20.     } else {
    21.       if (result && !result.length) {
    22.         result = arr[index - 1]
    23.       }
    24.       suitName(item)
    25.     }
    26.   })
    27. }
    28. console.log(JSON.stringify(result))