When installing mars3d, you need to install the copy webpack plugin plug-in
and then configure it in vue.config.js report an error: Error: error: [copy webpack plugin] patterns must be an array
the current node version is 12.2.0

const plugins = [
            // Identifies the home directory where cesium resources are located, which is needed for resource loading, multithreading, etc. inside cesium
            new webpack.DefinePlugin({
                CESIUM_BASE_URL: JSON.stringify(path.join(config.output.publicPath, cesiumRunPath))
            }),
            // Cesium-related resource directories need to be copied to the system directory (some CopyWebpackPlugin versions may not have patterns in their syntax)
           new CopyWebpackPlugin({
                patterns: [
                { from: path.join(cesiumSourcePath, 'Workers'), to: path.join(config.output.path, cesiumRunPath, 'Workers') },
                { from: path.join(cesiumSourcePath, 'Assets'), to: path.join(config.output.path, cesiumRunPath, 'Assets') },
                { from: path.join(cesiumSourcePath, 'ThirdParty'), to: path.join(config.output.path, cesiumRunPath, 'ThirdParty') },
                { from: path.join(cesiumSourcePath, 'Widgets'), to: path.join(config.output.path, cesiumRunPath, 'Widgets') }
                ]
            })
        ];

new CopyWebpackPlugin is changed as follows:

const plugins = [
            // Identifies the home directory where cesium resources are located, which is needed for resource loading, multithreading, etc. within cesium
         new webpack.DefinePlugin({
                CESIUM_BASE_URL: JSON.stringify(path.join(config.output.publicPath, cesiumRunPath))
         }),
         new CopyWebpackPlugin([
	        { from: path.join(cesiumSourcePath, 'Workers'), to: path.join(config.output.path, cesiumRunPath, 'Workers') },
	        { from: path.join(cesiumSourcePath, 'Assets'), to: path.join(config.output.path, cesiumRunPath, 'Assets') },
	        { from: path.join(cesiumSourcePath, 'ThirdParty'), to: path.join(config.output.path, cesiumRunPath, 'ThirdParty') },
	        { from: path.join(cesiumSourcePath, 'Widgets'), to: path.join(config.output.path, cesiumRunPath, 'Widgets') }
        ])
 ];

Run successfully