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Openlayers?extent??????fit()?????
????????Openlayers???????????????????????????????????extent???Openlayers??????????????????????setExtent????????????????fit()?????????????????????
??extent??????Openlayers??????extent?????????????????????????????????extent???????????????????????????setExtent????????????????????????x?y??????setExtent([-123.45, 45.67, -89.98, 131.42])???????????
????????????Openlayers???fit()????????????????????????????????????fit()???????????????????????????????????????????????????????????????
?????????????????setExtent?fit()?????????????????extent???????fit()?????????????????????????????????????????????????????
??????extent?fit()??????????????Openlayers?????????????????????????????????????Openlayers????????????????????
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