1.Chrome控制臺中 net::ERR_CONNECTION_REFUSED
js頻繁發送請求，有可能連接被拒絕，可用setTimeout，過幾秒發送，給個緩沖時間
var overlayAnalystService = L.supermap.spatialAnalystService(serviceUrl); setTimeout(function () { var datasetOverlayAnalystParameters = new SuperMap.DatasetOverlayAnalystParameters({sourceDataset: dataset,operateRegions: [polygon],tolerance: 0,operation: SuperMap.OverlayOperationType.CLIP,resultSetting: new SuperMap.DataReturnOption({expectCount: 0})});overlayAnalystService.overlayAnalysis(datasetOverlayAnalystParameters, function (serviceResult) {if(serviceResult && serviceResult.result && serviceResult.result.recordset) {var features = serviceResult.result.recordset.features.features;...}})
}, 1000);
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