Scratch3.0 页面初始化同时加载sb3文件的操作代码

componentDidMount() { 

    var _this = this;
		
	// 作品所在存放地址
	var sb3Path = null;
	
	
	console.log("尚未初始加载Sb3文件");
	$(window).on("load",function(){
		console.log("即将初始加载Sb3文件");
		let reader = new FileReader();
		let request = new XMLHttpRequest();
		console.log("加载的资源路径", sb3Path);
		request.open('GET', sb3Path, true);
		request.responseType = "blob";
		request.onload = function() {
			if(request.status==404){
				alert("未找到sb3类型的资源文件");
				location.href='/scratch';
			}
			let blobs = request.response
			reader.readAsArrayBuffer(blobs);
			reader.onload = () => _this.props.vm.loadProject(reader.result).then(() => {
				analytics.event({
					cateGory: 'project',
					action: 'Import Project File',
					nonInteraction: true
				});
				_this.props.onLoadingFinished(_this.props.loadingState);
			}).catch(error => {
				log.warn(error);
			});
		}
		request.send();
	});
}

// 必须加载这个文件
import SBFileUploader from '../../containers/sb-file-uploader.jsx';

class MenuBar extends React.Component {
   
    render () {
    
        return (
            <Box
                className={classNames(
                    this.props.className,
                    styles.menuBar,
                    {[styles.saveInProgress]: this.props.isUpdating}
                )}
            >
				<SBFileUploader onUpdateProjectTitle={PropTypes.func} >
					{(className, renderFileInput, loadProject) => (
						<button onClick={loadProject} className={classNames(styles.scratchHide)}></button>
					)}
				</SBFileUploader>
            </Box>
        );
    }
}

export default injectIntl(connect(
    mapStateToProps,
    mapDispatchToProps
)(MenuBar));