默认背景:
Cesium：改变地球背景_3d

更改后:
Cesium：改变地球背景_3d_02

主要代码:

.map3d{
            background-image: url("凯尔特人.jpg");
        }

<script>
    var viewer = new Cesium.Viewer('map3d', {
        animation: false,
        baseLayerPicker: false,
        geocoder: true,
        timeline: false,
        sceneModePicker: true,
        navigationHelpButton: false,
        infoBox: true,
        orderIndependentTranslucency: false,
        contextOptions: {
            webgl: {
                alpha: true,
            }
        },
    });
    viewer.scene.skyBox.show = false;
    viewer.scene.backgroundColor = new Cesium.Color(0.0, 0.0, 0.0, 0.0);
</script>

其中

orderIndependentTranslucency: false,
        contextOptions: {
            webgl: {
                alpha: true,
            }
        },

用来去掉地球表面的大气效果的黑圈问题