省份城市实现二级联动效果

<script> var citys = new Array(); //一个二维数组，用于存储省市，依次对应 citys[1]=new Array("济南","青岛","烟台","济宁","德州","莱芜"); citys[2]=new Array("安庆","阜阳","合肥","马鞍山","芜湖"); citys[3]=new Array("北

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