将字符串坐标数组（如：[[[109.2041015625,30.088107753367257],[115.02685546875,30.088107753367257], [115.02685546875,32.7872745269555],[109.2041015625,32.7872745269555],[109.2041015625,30.088107753367257]]]）和属性字段统一转成geojson数据格式！
geojson格式举例： { "type": "FeatureCollection", "features": [ {"type":"Feature", "properties":{}, "geometry":{ "type":"Point", "coordinates":[105.380859375,31.57853542647338] } } ] }