从 Request.js 请求方法返回结果? [英] Return results from Request.js request method?

问题描述

var request = require('request');varcheerio = require('cheerio');请求(网址，功能(错误，响应，html){if (!error && response.statusCode == 200) {var $ =cheerio.load(html);var link = $('.barbar li a');var Url = link.attr('href');var Title = link.find('span').first().text();var 结果 = [Url, Title];返回结果；}});控制台日志(结果)；

<块引用><块引用>

结果未定义...

我想使用结果向 HTML 页面添加超链接，但我不知道如何访问结果/在回调之外返回它们.我看过其他帖子，但它们都使用其他库，并且通常只有一个在范围内使用 console.log 的示例.

解决方案

var request = require('request');varcheerio = require('cheerio');功能 doYourThing(回调){请求(网址，功能(错误，响应，html){如果(错误){ 返回回调(错误)};if (!error && response.statusCode == 200) {var $ =cheerio.load(html);var link = $('.barbar li a');var Url = link.attr('href');var Title = link.find('span').first().text();var 结果 = [Url, Title];回调(空，结果)；}});函数主(){doYourThing(函数(错误，结果){控制台日志(错误，结果)；});};主要的();

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


    request(url, function (error, response, html) {
        if (!error && response.statusCode == 200) {
            var $ = cheerio.load(html);


            var link = $('.barbar li a');
            var Url = link.attr('href');
            var Title = link.find('span').first().text();
            var results = [Url, Title];


            return results;
        } 
    });

console.log(results);

results is undefined...

I want to use the results to add a hyperlink to an HTML page, but I don't know how to access the results/ return them outside of the callback. I've seen other posts but they all use other libraries and usually only have an example using console.log within the scope.

解决方案

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

function doYourThing(callback){
  request(url, function (error, response, html) {
    if(error){ return callback(error) };
    if (!error && response.statusCode == 200) {
      var $ = cheerio.load(html);
      var link = $('.barbar li a');
      var Url = link.attr('href');
      var Title = link.find('span').first().text();
      var results = [Url, Title];
      callback(null, results);
    } 
  });

function main(){
  doYourThing(function(err, results){
    console.log(err, results);
  });
};

main();

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