Methods of using arrays as function parameters in shell

#!/bin/bash
 
function showArr(){
  arr=$1
  for i in ${arr[*]}; do
    echo $i
  done
 
}
 
regions=("GZ" "SH" "BJ")
# Double quotation marks cannot be less 
showArr "${regions[*]}"
exit 0

Output results ：

GZ
SH
BJ