express.static（）不存在

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express.static（）不存在

[在下面的代码中使用express.static()时，出现错误消息，告诉我该函数不存在。

这是我的代码：

var app = require("express");
var consign = require("consign");
var bodyParser = require("body-parser")
var expressValidator = require("express-validator");

var express = app();
express.set('view engine', 'ejs');
express.set('views', './app/views');

express.use(express.static("./app/public"));
express.use(bodyParser.urlencoded({extended: true}));
express.use(expressValidator());

consign()
    .include('app/routes')
    .then('config/db.js')
    .then('app/models')
    .then('app/controllers')
    .into(express);

module.exports = express;

var express = require("express"); // !!!
var consign = require("consign");
var bodyParser = require("body-parser")
var expressValidator = require("express-validator");

var app = express(); // !!!
app.set('view engine', 'ejs');
app.set('views', './app/views');

app.use(express.static("./app/public"));
app.use(bodyParser.urlencoded({extended: true}));
app.use(expressValidator());

consign()
    .include('app/routes')
    .then('config/db.js')
    .then('app/models')
    .then('app/controllers')
    .into(app); // !!!

module.exports = express;

• https://expressjs/en/starter/static-files.html

Eu faloinglês，desculpe。 Eu normalmente daria umaexplicação。

英语：我说英语，对不起。我通常会给一个解释。