用 ES6 的 let

var express = require('express');
var cheerio = require('cheerio');
var superagent = require('superagent');
var items = [];

var app = express();
for(var i=1;i<100;i++) {
let j = i;
app.get('/', function (req, res, next) {
superagent.get('http://xxx/' + j + '.html')
.end(function (err, sres) {
if (err) {
return next(err);
}
var $ = cheerio.load(sres.text);
items.push($('.d1').attr('href'));
res.send(items);
});
});
}

app.listen(3000, function () {
console.log('app is listening at port 3000');
});