Cesium场景出图

saveToFile() {
        viewer.render();//重新渲染界面
        let canvas = viewer.scene.canvas;
        let image = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream")
        let link = document.createElement("a");
        let blob = this.dataURLtoBlob(image);
        let objurl = URL.createObjectURL(blob);
        link.download = "scene.png";
        link.href = objurl;
        link.click();
    }

dataURLtoBlob(dataurl) {
        let arr = dataurl.split(','),
            mime = arr[0].match(/:(.*?);/)[1],
            bstr = window.atob(arr[1]),
            n = bstr.length,
            u8arr = new Uint8Array(n);
        while (n--) {
            u8arr[n] = bstr.charCodeAt(n);
        }
        return new Blob([u8arr], { type: mime });
    }

注：在场景出图的实现过程中遇到两个问题：

1、导出图片一片黑

处理办法：viewer.render();//重新渲染界面

2、提示atob()已被弃用

处理办法：window.atob()