省份与城市的二级级联 用javascript实现答:230715|红星区,230716|上甘岭区,230722|嘉荫县,230781|铁力市,230800|佳木斯市,230801|市辖区,230803|向阳区,230804|前进区,230805|东风区,230811|郊区,230822|桦南县,230826|桦川县,230828|汤原县,230833|抚远县,230881|同江市,230882|富锦市,230900|七台河市,230901|市辖区,230902|新兴区,230903|桃山区,230904|...