約30行代碼實現一個簡單nodejs爬蟲工具，定時抓取網頁數據。

使用npm模塊

var request = require(‘request‘);
var fs = require("fs");

var JJurl = "https://recommender-api-ms.juejin.im/v1/get_recommended_entry?suid=6bYFY7IRbfmijiJeeeIQ&ab=welcome_3&src=web"
var title = ""

var
 
 options = {
    uri: JJurl,
    headers: {
        ‘User-Agent‘: ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36‘,
    },
    json: true
};

setInterval(function() {
    request(options, function(error, response, body) {
        if (!error) {
            
 
for (var i in body.d) {
                title += body.d[i].title + "\n"
            }
            fs.writeFile(‘./result.txt‘, title, function(err) {
                if (err) {
                    throw err;
                }
            });
        } else {
            console.log(‘抓取失敗‘)
        }
    });
}, 
 
5000);

簡單實現nodejs爬蟲工具