今天遇到的一个问题:给出任意一个二维数组,要求输出数组元素的所有排列组合。
如
var
myArr = [[
'A',
'B',
'C'],[
'A1',
'B1',
'C1'],[
'A2',
'B2']];
myArr数组元素的所有排列组合为:
"AA1A2"
"BA1A2"
"CA1A2"
"AB1A2"
"BB1A2"
"CB1A2"
"AC1A2"
"BC1A2"
"CC1A2"
"AA1B2"
"BA1B2"
"CA1B2"
"AB1B2"
"BB1B2"
"CB1B2"
"AC1B2"
"BC1B2"
"CC1B2"
代码如下:
function serialArray(arr){ var lengthArr = []; var productArr = []; var result = []; var length = 1; for(var i = 0; i < arr.length; i++){ var len = arr[i].length; lengthArr.push(len); var product = i === 0 ? 1 : arr[i - 1].length * productArr[i - 1]; productArr.push(product); length *= len; } for(var i = 0; i < length; i++){ var resultItem = ''; for(var j = 0; j < arr.length ; j ++){ resultItem += arr[j][Math.floor(i / productArr[j]) % lengthArr[j]]; } result.push(resultItem); } return result } var myArr = [['A','B','C'],['A1','B1','C1'],['A2','B2']]; console.log(serialArray(myArr)); var myArr1 = [['A','B','C'],['A1','B1','C1','D1','E1','F1'],['A2','B2','C2'],['A3','B3','C3','D3']]; console.log(serialArray(myArr1)); var myArr2 = [['A','B','C'],['A1','B1','C1','D1'],['A2','B2','C2']]; console.log(serialArray(myArr2));