前端将俩数组以奇偶数穿插进行合并

请问js有什么好办法让让两个数组合并在一起，以奇偶数穿插的方式
例如：

var a = [“a”,"b","c"]
var b = ["1","2","3"]
//得到：var c = ["a","1","b","2","c","3"]
//a,b数组长度不固定，动态获取情况下

var a = ['a', 'b', 'c', 'd', 'e']
      var b = ['1', '2', '3', '4', '5', '6']

      function func(arr1, arr2, result = []) {
        if (arr1.length >= arr2.length) {
          for (let i = 0; i < arr1.length; i++) {
            if (arr1[i]) {
              result.push(arr1[i])
            }
            if (arr2[i]) {
              result.push(arr2[i])
            }
          }
        } else {
          for (let i = 0; i < arr2.length; i++) {
            if (arr1[i]) {
              result.push(arr1[i])
            }
            if (arr2[i]) {
              result.push(arr2[i])
            }
          }
        }
        return result
      }
      const res = func(a, b)
      console.log('res', res)