func insertSliceAtIndex(slice_origin []int, slice_to_insert []int,      insertIndex int) (result []int, err error) {      if insertIndex > len(slice_origin) {          return nil, errors.New("insertIndex不能大于slice_origin的长度")      }        result = make([]int, len(slice_origin)+len(slice_to_insert))      for i := 0; i < len(result); i++ {          if i < insertIndex { //插入点之间              result[i] = slice_origin[i]          } else if i < insertIndex+len(slice_to_insert) { //插入内容              result[i] = slice_to_insert[i-insertIndex]          } else {              result[i] = slice_origin[i-len(slice_to_insert)]          }      }      return  }

d := []string{"Welcome", "for", "Tianjin", "Have", "a", "good", "journey"}      insertSlice := []string{"It", "is", "a", "big", "city"}      insertSliceIndex := 3      d = append(d[:insertSliceIndex],          append(insertSlice, d[insertSliceIndex:]...)...)      fmt.Printf("result:%v\n", d)