cesium listens to map zoom or zoom to control whether the content added on the map is displayed

Controlling the display and hiding of entities according to the height of the viewing angle, the specific effects are as follows:

The main code is as follows:

// Monitor map zoom or zoom to control whether the content added on the map is displayedcontrolVisible() {viewer.camera.changed.addEventListener(function() {//View change monitoringvar currentMagnitude = viewer.camera.getMagnitude();if (currentMagnitude > 13000000) {for (let i = 0; i < viewer.entities.values.length; i++) {viewer.entities.values[i].show = false;}} else {for (let i = 0; i < viewer.entities.values.length; i++) {viewer.entities.values[i].show = true;}}});},