js二维数组var arr = [['a','b','c'],[1,2,3],['x','y','z']]生成一维数组

var arr = [['a','b','c'],[1,2,3],['x','y','z']]

function doExchange(arr){

var newArr= [];

let a1 = arr[0]

let a2 = arr[1]

let a3 = arr[2]

for(var i = 0; i < a1.length; i ++) {

for(var j = 0; j < a2.length; j ++) {

for(var k = 0; k < a3.length; k ++) {

newArr.push(a1[i]+a2[j]+a3[k])

}

}

}

return newArr

}

let arrNew = doExchange(arr)

console.log(arrNew);