TypeScript
clicked(data) {
    let that = this
    console.warn(data)
    if(data.getTag() == 'appUpload'){
        //如果不想用浏览器input标签和样式，完全可以只用自己的button，点击事件后用代码动态加载input标签不用体现出其界面即可！
        var inputObj=document.createElement('input')
        inputObj.setAttribute('id','file');
        inputObj.setAttribute('type','file');
        inputObj.setAttribute('name','file');
        inputObj.setAttribute("style",'visibility:hidden');
        document.body.appendChild(inputObj);
        //调用接口模拟鼠标点击，触发弹出文件选择窗口
        inputObj.click();
        //监听input file的事件，一般就是文件选择变化
        document.querySelector('#file').addEventListener('change', e => {
            //通过FormData来作为表单，注意，肯定不是获取文件的绝对路径
            var formData = new FormData();
            //文件请求
            var xmlHttp = new XMLHttpRequest();
            //事件回调中的文件对象
            var files = e.target.files
            if(files.length > 0){
                formData.append('file',files[0])
                // formData.append('csrfmiddlewaretoken', '{{csrf_token}}')
            }else{
                layui.layer.msg("{% trans '请选择文件' %}")
            }
            function isSubmit(){
                console.log(xmlHttp)
                if(xmlHttp.readyState == 4 ) {
                    layui.layer.confirm(xmlHttp.response, {icon: 3, title:'提示'}, function(index){
                        layui.layer.closeAll();
                    });
                    //为了保证能持续点击，持续执行上传文件，需要把前面创建的dom移除！
                    document.body.removeChild(inputObj)
                }
            }
            var loadingIndex = layui.layer.load(1);
            //POST请求提交
            xmlHttp.open("POST","/adApps/upload");
            xmlHttp.onreadystatechange=isSubmit;
            //表单文件发送
            xmlHttp.send(formData);
        });
    }
}

TypeScript
 e.post("/adApps/upload", f, function (req, res) {
    const fs = require('fs')
    console.log(req.files.file)
    // 使用fs模块的rename重命名方法重名字保存的文件，才能正常使用
    //rename('旧文件名，新文件， 回调 ')
    var oldPath = req.files.file.path    //这里是一个目录，并非浏览器前端对应本地机器的绝对目录，而是需要将这个带路径的文件名，重新另存为服务器的某个目录以及新的文件名，实现上传到服务器成功！
    var newPath = __dirname + '/../instance-enjoy/custom/libs/adApps/' + req.files.file.originalFilename

//1）fs.rename方式来接受前端input file模式结合FormData、XMLHttpRequest传递过来，有些目录存储会提示报错：EXDEV: cross-device link not permitted
    // fs.rename(oldPath, newPath, function (err) {
    //     if(err) {
    //         console.warn(err)
    //         res.send('上传失败')
    //     }else{
    //         res.send('上传成功')
    //     }
    //     res.end();
    // })

//2）用如下方式即可解决问题，不再提示报错，并且能后台接收文件保存成功！
    fs.readFile(oldPath, function (err, data) {
        if (err) throw err;
        console.log('File read!');

// Write the file
        fs.writeFile(newPath, data, function (err) {
            if (err) throw err;
            res.write('File uploaded and moved!');
            res.end();
            console.log('File written!');
        });

// Delete the file
        fs.unlink(oldPath, function (err) {
            if (err) throw err;
            console.log('File deleted!');
        });
    })

})

TypeScript
var js_files = files.filter((f)=>{
    return f.endsWith('.js');
});

TypeScript
var fn_hello = async (ctx, next) => {
    var name = ctx.params.name;
    ctx.response.body = `<h1>Hello, ${name}!</h1>`;
};
module.exports = {
    'GET /hello/:name': fn_hello
};

TypeScript
for (var f of js_files) {
    console.log(`process controller: ${f}...`);
    // 导入js文件:
    let mapping = require(__dirname + '/controllers/' + f);
    for (var url in mapping) {
        if (url.startsWith('GET ')) {
            // 如果url类似"GET xxx":
            var path = url.substring(4);
            router.get(path, mapping[url]);
            console.log(`register URL mapping: GET ${path}`);
        } else if (url.startsWith('POST ')) {
            // 如果url类似"POST xxx":
            var path = url.substring(5);
            router.post(path, mapping[url]);
            console.log(`register URL mapping: POST ${path}`);
        } else {
            // 无效的URL:
            console.log(`invalid URL: ${url}`);
        }
    }
}