说明: 上海地图边界坐标JSON文件 样例:{"type": "Feature","properties":{"id":"310114","name":"嘉定区","cp":[121.2437,31.3625],"childNum":1},"geometry":{"type":"Polygon","coordinates":[[[121.3014,31.4971],[121.3042,31.4971],[12 1.3097,31.4923],[121.3097,31.4882],[121.3124,3
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