interaction.on('drawend', function () {
var areaMeasureParam = new SuperMap.MeasureParameters(feature.getGeometry());
new ol.supermap.MeasureService(url).measureArea(areaMeasureParam,
function(serviceResult) {
widgets.alert.showAlert(serviceResult.result.area + resources.msg_sqm, true);
});
});
无法显示测量信息。