Question

我正在开发网络抓取工具，并且已经成功地能够从该站点检索信息。唯一的问题是，我需要有关如何传递多个命令行参数的帮助，就我而言，我想传递多个音乐艺术家以返回在网站上找到的内容，这将允许返回更多数据。

我尝试使用for循环来获取命令行参数的数量。然后尝试使用foreach循环。

var request = require('request');
var cheerio = require('cheerio');
const args = process.argv.slice(2);


//request function that uses three parameters were we check for the error and response type

request(' https://www.billboard.com/charts/rap-song', function (error, response, html){ 
    if(!error && response.statusCode === 200) { 
        var $ = cheerio.load(html);


        var results = $('div').find('.chart-list-item__artist:contains("'+ artist +'")').each(function () { 
            // console.log($(this).text());
        }).text();
});

也许是因为包含操作符只能处理一个命令行参数？或仅获得指定的第一位艺术家。

Expected output: node artists.js "Post Malone" "Lil Baby"
----------------
Post Malone & Swae Lee

Post Malone

Lil Baby

Yo Gotti Featuring Lil Baby



Actual Output: node artists.js "Post Malone" "Lil Baby"
--------------
Post Malone & Swae Lee

Post Malone

Answer 1

据我所知，您应该迭代艺术家并检查每个艺术家的匹配项，而不是仅在匹配一位艺术家之后对元素进行迭代。

我认为这样-基于您的拥有

var request = require('request');
var cheerio = require('cheerio');
const args = process.argv.slice(2);


//request function that uses three parameters were we check for the error and response type

request(' https://www.billboard.com/charts/rap-song', function (error, response, html){ 
  if(!error && response.statusCode === 200) { 
    var $ = cheerio.load(html);

    var results = [];
    args.forEach(artist => {
      $('div').find('.chart-list-item__artist:contains("'+ artist +'")').each(function () { 
          // console.log($(this).text());
          results.push(this); // push current element into results
      }).text();
    });
  });
})

如何处理多个字符串节点命令行参数？

1 个答案: