两个数组合并成一个数组 请把两个数组 ['A1', 'A2', 'B1', 'B2', 'C1', 'C2', 'D1', 'D2'] 和 ['A', 'B', 'C', 'D']，合并为 ['...

方案1

 let arr1 = ['A1', 'A2', 'B1', 'B2', 'C1', 'C2', 'D1', 'D2']
  let arr2 = ['A', 'B', 'C', 'D']
  arr2 = arr2.map(v => `${v}3`);
  let arr3=[...arr1, ...arr2].sort().map(v => v.replace('3', ''))
  console.log(arr3)

方案2

  let arr1 = ['A1', 'A2', 'B1', 'B2', 'C1', 'C2', 'D1', 'D2']
  let arr2 = ['A', 'B', 'C', 'D']
  let arr3=[]
  while(arr1.length){
    arr3.unshift(arr2.pop());
    arr3.unshift(arr1.pop());
    arr3.unshift(arr1.pop());

  }
  console.log(arr3)

方案3

 let arr1 = ['A1', 'A2', 'B1', 'B2', 'C1', 'C2', 'D1', 'D2']
 let arr2 = ['A', 'B', 'C', 'D']
 let arr3 = []
 let x, y, z;
 while (arr1.length) {
   [[x, y, ...arr1], [z, ...arr2]] = [arr1, arr2];
   arr3.push(x, y, z);
 }

 console.log(arr3)