Express ?????

?????????

??????????????????????JavaScript ?????????????????????????????????

function static(root, options = {}) {    const {         dotfiles = "ignore",        etag = true,        lastModified = true,        maxAge = 0,        setHeaders    } = options;        return function (req, res, next) {        const { pathname } = url.parse(req.url, true);        const file = path.join(root, pathname);        const parts = file.split(path.sep);        const isDotFile = parts[parts.length - 1][0] === ".";                if (isDotFile && dotfiles === "deny") {            res.setHeader("Content-Type", "text/html");            res.statusCode = 403;            return res.end(http.STATUS_CODES[403]);        }                fs.stat(file, (error, stat) => {            if (error) {                next();            } else {                if (etag) {                    res.setHeader("ETag", stat.mtime.toLocaleDateString());                }                if (lastModified) {                    res.setHeader("Last-Modified", stat.mtime.toUTCString());                }                if (typeof setHeaders === "function") {                    setHeaders(req, req, (params) => {                        console.log(params);                    });                }                res.setHeader("Cache-Control", `max-age=${maxAge}`);                res.setHeader("Content-Type", mime.getType(file));                fs.createReadStream(file).pipe(res);            }        });    };}

bodyParser ???

bodyParser ?????????????????????????????????????

1. JSON ???

function json(options) {    return function (req, res, next) {        const contentType = req.headers["content-type"];        if (contentType === "application/json") {            const buffer = [];            req.on("data", (data) => {                buffer.push(data);            });            req.on("end", () => {                const result = buffer.toString();                req.body = JSON.parse(result);                next();            });        } else {            next();        }    };}

2. URL-encoded ???

function urlencoded(options) {    const { extended } = options;    return function (req, res, next) {        const contentType = req.headers["content-type"];        if (contentType === "application/x-www-form-urlencoded") {            const buffer = [];            req.on("data", (data) => {                buffer.push(data);            });            req.on("end", () => {                const result = buffer.toString();                if (extended) {                    req.body = qs.parse(result);                } else {                    req.body = querystring.parse(result);                }                next();            });        } else {            next();        }    };}

3. ?????

function text(options) {    return function (req, res, next) {        const contentType = type.parse(req.headers["content-type"]);        const charset = contentType.parameters.charset;        const cType = contentType.type;        if (cType === "text/plain") {            const buffer = [];            req.on("data", (data) => {                buffer.push(data);            });            req.on("end", () => {                const r = Buffer.concat(buffer);                if (charset === "gbk") {                    req.body = iconv.decode(r, charset);                } else {                    req.body = buffer.toString();                }                next();            });        } else {            next();        }    };}

???????? Express ????????????????????????????

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