原文链接及内容

原文链接：https://sandcastle.cesium.com/?src=DataSource%20Ordering.html&label=All

效果如下图所示：

示例代码如下：

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/**
 * 关于wsenDegrees属性，
 * 请参考：https://github.com/AnalyticalGraphicsInc/czml-writer/wiki/RectangleCoordinates中的定义
 *
 */

//显然为两个紧挨着的红色矩形和蓝色矩形
const czml1 = [
  {
    id: "document",
    name: "CZML Geometries: Rectangle",
    version: "1.0",
  },
  {
    rectangle: {
      coordinates: {
        wsenDegrees: [-120, 40, -110, 50],
      },
      fill: true,
      material: {
        solidColor: {
          color: {
            rgba: [255, 0, 0, 255],
          },
        },
      },
    },
  },
  {
    rectangle: {
      coordinates: {
        wsenDegrees: [-110, 40, -100, 50],
      },
      fill: true,
      material: {
        solidColor: {
          color: {
            rgba: [0, 0, 255, 255],
          },
        },
      },
    },
  },
];

//显然为两个紧挨着的黄色矩形和水蓝色矩形。
const czml2 = [
  {
    id: "document",
    name: "CZML Geometries: Rectangle",
    version: "1.0",
  },
  {
    rectangle: {
      coordinates: {
        wsenDegrees: [-120, 45, -110, 55],
      },
      fill: true,
      material: {
        solidColor: {
          color: {
            rgba: [255, 255, 0, 255],
          },
        },
      },
    },
  },
  {
    rectangle: {
      coordinates: {
        wsenDegrees: [-110, 45, -100, 55],
      },
      fill: true,
      material: {
        solidColor: {
          color: {
            rgba: [0, 255, 255, 255],
          },
        },
      },
    },
  },
];

const viewer = new Cesium.Viewer("cesiumContainer", {
  geocoder: false,
  sceneModePicker: false,
  homeButton: false,
  navigationHelpButton: false,
  baseLayerPicker: false,
  navigationInstructionsInitiallyVisible: false,
  fullscreenButton: false,
  selectionIndicator: false,
  skyBox: false,
  timeline: false,
  animation: false,
  shouldAnimate: true,
});
viewer.cesiumWidget.creditContainer.style.display = "none";
const promise1 = Cesium.CzmlDataSource.load(czml1);
viewer.dataSources.add(promise1);
const promise2 = Cesium.CzmlDataSource.load(czml2);
viewer.dataSources.add(promise2);

/**
 * raise方法表示将数据源在集合中向上移动一个位置。
 * lower方法表示将数据源在集合中的位置向下移动一位。
 */
Sandcastle.addToolbarButton("Swap(交换)", function () {
  Promise.all([promise1, promise2]).then(function (results) {
    const ds1 = results[0];
    const ds2 = results[1];
    if (viewer.dataSources.indexOf(ds1) === 0) {
      viewer.dataSources.raise(ds1);
    } else {
      viewer.dataSources.lower(ds1);
    }
  });
});