我可以在Node.js中使用jQuery吗？

在运行之前,请安装依赖项:

npm安装请求iconv-lite cheerio

最后:

node crawler.js

以下链接

下一步是关注链接.假设您要在SO上列出每个热门问题的所有海报.您必须先列出所有热门问题(例如上面的代码),然后输入每个链接,解析每个问题的页面以获取相关用户的列表.

当你开始关注链接时,可以开始回调地狱.为了避免这种情况,你应该使用某种承诺,期货或其他什么.我总是在我的工具带中保持异步.所以,这是一个使用async的爬虫的完整示例:

var
    url = require('url'),
    request = require('request'),
    async = require('async'),
    cheerio = require('cheerio');

var
    baseUrl = 'http://stackoverflow.com/';

// Gets a page and returns a callback with a $ object
function getPage(url, parseFn) {
    request({
        url: url
    }, function (error, response, body) {
        parseFn(cheerio.load(body))
    });
}

getPage(baseUrl, function ($) {
    var
        questions;

    // Get list of questions
    questions = $('.question-summary .question-hyperlink').map(function () {
        return {
            title: $(this).text(),
            url: url.resolve(baseUrl, $(this).attr('href'))
        };
    }).get().slice(0, 5); // limit to the top 5 questions

    // For each question
    async.map(questions, function (question, questionDone) {

        getPage(question.url, function ($$) {

            // Get list of users
            question.users = $$('.post-signature .user-details a').map(function () {
                return $$(this).text();
            }).get();

            questionDone(null, question);
        });

    }, function (err, questionsWithPosters) {

        // This function is called by async when all questions have been parsed

        questionsWithPosters.forEach(function (question) {

            // Prints each question along with its user list
            console.info(question.title);
            question.users.forEach(function (user) {
                console.info('\t%s', user);
            });
        });
    });
});

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npm install jquery

var $ = require("jquery");

$.ajax({
    url: 'gimme_json.php',
    dataType: 'json',
    method: 'GET',
    data: { "now" : true }
});

var navigator = { userAgent: "node-js" };  
var jQuery = require("./node-jquery").jQueryInit(window, navigator);

const jsdom = require("jsdom");
const dom = new jsdom.JSDOM(``);
var $ = require("jquery")(dom.window);


$.getJSON('https://api.github.com/users/nhambayi',function(data) {
  console.log(data);
});

npm install jquery

var $ = require('jquery');
var http = require('http');

var options = {
    host: 'jquery.com',
    port: 80,
    path: '/'
};

var html = '';
http.get(options, function(res) {
res.on('data', function(data) {
    // collect the data chunks to the variable named "html"
    html += data;
}).on('end', function() {
    // the whole of webpage data has been collected. parsing time!
    var title = $(html).find('title').text();
    console.log(title);
 });
});

const jsdom = require("jsdom");
const { window } = new jsdom.JSDOM(`...`);
var $ = require("jquery")(window);