【解决方案】
var waterLayer =scene.layers.find('srsb_water');
var a=Cesium.Math.toDegrees(waterLayer.layerBounds.west);
var b=Cesium.Math.toDegrees(waterLayer.layerBounds.south);
var c=Cesium.Math.toDegrees(waterLayer.layerBounds.east);
var d=Cesium.Math.toDegrees(waterLayer.layerBounds.north);
viewer.camera.setView({
destination : Cesium.Rectangle.fromDegrees(a,b,c,d),
});
