代码如下：
省：
市：
县：
因引用的citys.js的数据太多，所以截取了一部分如下：
citys.js
var citys = {
"districts": [{
"adcode": "100000",
"name": "中华人民共和国",
"districts": [{
"adcode": "410000",
"name": "河南省",
"districts": [{
"citycode": "0379",
"adcode": "410300",
"name": "洛阳市",
"center": "112.434468,34.663041",
"level": "city",
"districts": [{
"citycode": "0379",
"adcode": "410323",
"name": "新安县",
"center": "112.141403,34.728679",
"level": "district",
"districts": []
}]
},
{
"citycode": "0398",
"adcode": "411200",
"name": "三门峡市",
"center": "111.194099,34.777338",
"level": "city",
"districts": [{
"citycode": "0398",
"adcode": "411221",
"name": "渑池县",
"center": "111.762992,34.763487",
"level": "district",
"districts": []
}]
}
]
},
{
"citycode": [],
"adcode": "440000",
"name": "广东省",
"center": "113.280637,23.125178",
"level": "province",
"districts": [{
"citycode": "0754",
"adcode": "440500",
"name": "汕头市",
"center": "116.708463,23.37102",
"level": "city",
"districts": [{
"citycode": "0754",
"adcode": "440513",
"name": "潮阳区",
"center": "116.602602,23.262336",
"level": "district",
"districts": []
}]
}]
}]
}]
}
代码就以上所示。
