擷取 costco 商品資料，如果商品沒有貨， result 的結果會是已售完

scapeCostco.js

var request = require('request');
var cheerio = require('cheerio');

var url = 'https://www.costco.com.tw/Baby-Care-Kids-Toys/Toys/Infant-%26-Preschool/VTech-Sit-To-Stand-Ultimate-Alphabet-Train/p/105123';
request(url, function(err, res, body){

    var $ = cheerio.load(body);

    var result = $('.stock-status').text().trim();

    console.log(result);

});