省份城市實現二級聯動效果

<script> var citys = new Array(); //一個二維數組，用於存儲省市，依次對應 citys[1]=new Array("濟南","青島","煙臺","濟寧","德州","萊蕪"); citys[2]=new Array("安慶","阜陽","合肥","馬鞍山","蕪湖"); citys[3]=new Array("北

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