app.js

var express = require('express');
var app = express();

var router = express.Router();

router.get('/', function (req, res) {
        res.send('hello world');
});

router.get('/reset', function (req, res) {
    var router_stack = router.stack.concat([]);
    router.stack.length = 0;
    router_stack.forEach(function (item) {
        if (item.route.path !== '/') {
            router.stack.push(item);
        }
    });
    res.send('ok');
});

process.on('SIGTERM', function() {
    console.log('Controller will be reload');
});

app.use(router);
app.listen(3000);

问一个小白问题,router.stack 明明是数组，为什么还要.concat([])呢?