JSON输出与Node JS一团糟
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【中文标题】JSON输出与Node JS一团糟【英文标题】：JSON Output is a mess with Node JS 【发布时间】：2021-12-03 11:13:27 【问题描述】：我用 Node JS 创建了一个简单的网络爬虫来提取手表价格，代码如下：
import axios from 'axios'
import cheerio from 'cheerio'
import * as fs from 'fs'
let Array1=[];
let a = 0;
let b=1;
axios.get("URL").then((response) =>
let $ = cheerio.load(response.data);
$(".article-title").each((i, e) =>
let title = $(e).text();
Array1[a] = title;
a = a+2;
)
$(".article-price").each((i, e) =>
let price = $(e).text();
Array1[b] = price;
b = b+2;
)
let data = JSON.stringify(Array1);
fs.writeFileSync('sub.json', data);
);
但是，JSON 输出如下：
["\n Rolex Submariner 5513 Maxi MK5 Dial","\n \n \n 16 000 €\n ","\n Rolex Submariner Black Dial Date 41mm - 2021 - 126610LN","\n \n \n 14 839 €\n ","\n Rolex Black Dial Submariner Date 41mm - 2021 Card - 126610ln","\n \n \n 14 839 €\n ","\n Rolex Submariner Meter First MK1","\n \n \n 15 416 €\n ","\n Rolex Submariner 16610 military NATO 1994 S series","\n \n \n 35 000 €\n ","\n Rolex Submariner 126610LV Starbucks NEW 06/2021 Full set","\n \n \n 17 400 €\n ","\n Rolex 06/2021 - Submariner Date 126610 LN 99%new","\n \n \n 13 300 €\n ","\n Rolex Submariner 6536 Gilt James Bond 1956","\n \n \n 33 000 €\n ","\n Rolex Submariner Date Starbucks Automatik Edelstahl Herrenuhr...","\n \n \n 17 770 €\n ","\n Rolex Submariner","\n \n \n 12 500 €\n ","\n Rolex Submariner Date NOS avec stickers","\n \n \n 17 900 €\n ","\n Rolex Submariner 5513 \"Meter first\"","\n \n \n 16 000 €\n ","\n Rolex Submariner","\n \n \n 9 700 €\n ","\n Rolex Submariner 16610LV Kermit Y series 2003 Fat Four Mark 1...","\n \n \n 38 000 €\n ","\n Rolex Submariner Date 116610LN Boite/Papiers 2020","\n \n \n 13 790 €\n ","\n Rolex NEW 2021 some stickers - Submariner No Date 124060","\n \n \n 12 490 €\n ","\n Rolex Submariner 14060M Full Set","\n \n \n 10 900 €\n ","\n Rolex Submariner Date 18K Gold Automatik Herrenuhr Oyster...","\n \n \n 27 240 €\n ","\n Rolex \"Submariner \"\"Hulk\"\"\"Model 116610LV Full Set 2017","\n \n \n 19 950 €\n ","\n Rolex Submariner Date 116619LB Rolex Serviced 2017","\n \n \n 36 500 €\n ","\n Rolex Submariner 5513 Feet First","\n \n \n 16 000 €\n ","\n Rolex Submariner","\n \n \n 12 900 €\n ","\n Rolex Submariner 5513 Maxi dial 1979","\n \n \n 19 000 €\n ","\n Rolex Submariner Date 16610 Boite / Papiers","\n \n \n 11 750 €\n ","\n Rolex Mint 2021 KERMIT / STARBUCKS - Submariner Date 126610 LV...","\n \n \n 17 500 €\n ","\n Rolex Submariner 41 No-Date - 124060 - Full Set - 2021","\n \n \n 12 900 €\n ","\n Rolex Submariner Date Stahl / Gold Automatik Herrenuhr Oyster...","\n \n \n 9 550 €\n ","\n Rolex Submariner (No Date) 14060M 2 Lines Full set 2005","\n \n \n 11 200 €\n ","\n Rolex Submariner Date 41mm NEW 09/2021","\n \n \n 14 500 €\n ","\n Rolex Submariner 16610LV \"Kermit\"","\n \n \n 17 500 €\n ","\n Rolex Submariner Céramique 40mm","\n \n \n 12 900 €\n ","\n Rolex Submariner 5513 Gilt Glossy 1966 Rolex warranty","\n \n \n 48 000 €\n ","\n Rolex Submariner 14060M Boite / Papiers","\n \n \n 11 450 €\n ","\n Rolex Submariner date - Oyster Perpetual","\n \n \n 18 000 €\n ","\n Rolex Submariner Date - 116610LN- Full Set - 2012","\n \n \n 12 500 €\n ","\n Rolex Submariner No Date Automatik Stahl Oyster Perpetual Ref....","\n \n \n 10 650 €\n ","\n Rolex Submariner 116610 \"Hulk\" 2010 SERIE G FULL SET STICKERS","\n \n \n 22 500 €\n ","\n Rolex Submariner Date Or Blanc 41mm New 07/2021","\n \n \n 43 900 €\n ","\n Rolex Submariner Date 2000 Full set","\n \n \n 10 800 €\n ","\n Rolex Submariner","\n \n \n 11 900 €\n ","\n Rolex Submariner 16610 COMEX M series full set 2008","\n \n \n 89 000 €\n ","\n Rolex Submariner Date Purple dial","\n \n \n 12 290 €\n ","\n Rolex Submariner (No Date)","\n \n \n 11 000 €\n ","\n Rolex Submariner 5508 Tropical James Bond - 1958","\n \n \n 26 000 €\n ","\n Rolex Submariner Date Kermit Automatik Stahl Herrenuhr Ref....","\n \n \n 16 950 €\n ","\n Rolex montre rolex 5513 submariner 39 mm automatique en acier...","\n \n \n 11 120 €\n ","\n Rolex Submariner \"Kermit\"1661OLV","\n \n \n 17 000 €\n ","\n Rolex Submariner Date 1996 série W Full set","\n \n \n 10 900 €\n ","\n Rolex Submariner","\n \n \n 11 900 €\n ","\n Rolex Submariner 16610 S series 1994 tritium from Hawaii","\n \n \n 14 900 €\n ","\n Rolex Submariner Date Mk1 military NATO rare country code 905...","\n \n \n 13 290 €\n ","\n Rolex Submariner Date","\n \n \n 15 000 €\n ","\n Rolex Submariner 5513","\n \n \n 12 500 €\n ","\n Rolex Submariner Date Stahl / Gold Automatik Oyster Perpetual...","\n \n \n 14 250 €\n ","\n Rolex submariner 16613t 40 mm automatique or & acier gold new...","\n \n \n 12 845 €\n ","\n Rolex Submariner Date de 1988","\n \n \n 8 900 €\n ","\n Rolex Submariner No Date 14060 4 Lignes 2009 Full Set","\n \n \n 12 000 €\n ","\n Rolex Submariner \"Kermit\"","\n \n \n 17 000 €\n ","\n Rolex Submariner","\n \n \n 9 600 €\n ","\n Rolex Submariner Date 116613 LN","\n \n \n 13 500 €\n ","\n Rolex Submariner Date Blue Dial 40mm Gold steel FULL SET","\n \n \n 12 980 €\n ","\n Rolex Submariner No Date Stickers - 124060 - Full Set - 2020","\n \n \n 12 500 €\n ","\n Rolex Submariner Stahl / Gold Automatik Herrenuhr Ref....","\n \n \n 16 020 €\n ","\n Rolex Submariner Date","\n \n \n 11 150 €\n "]
为了使用 jQuery 获取数据并在 html 表中显示，我怎样才能使它变得更好？我想要一个如下所示的 JSON 输出：
[
"title": "Rolex Submariner 5513 Maxi MK5 Dial",
"price": "16 000"
,
"title": "Rolex Submariner Black Dial Date 41mm - 2021 - 126610LN",
"price": "14 839"
,
非常感谢！！几天以来一直卡在这里......
【问题讨论】：
从外观上看，您应该从值中去除换行符。title = title.replace(/[\n\r]/g, '');***.com/questions/25582820/…
您确定这是 JSON 编码问题，而不是原始数据的问题吗？
看起来您的数组正确分离了所有内容，即 [product1, price1, product2, price2, ...]。然后它只是一种提取文本和数字并从中创建json对象的方式。您可以使用正则表达式或类似的东西提取数据。或者只是删除\n 字符和周围的空白。
我试过title = title.replace(/[\n\r]/g, '');，我的JSON输出现在是[" Rolex Submariner"," 10 900 € ",；没有 \n 会更好，但如果在 html 中显示数据之前有类名，我的问题
我会去掉新行和双倍行距（不关闭单个空格）。
【参考方案1】：
以下是如何将 JSON 输出转换为所需格式的示例：
function jsonToPrettyJson(json)
const list = [];
for (const line of json)
list.push(line.trim());
const prettyJson = [];
for (let i = 0; i < list.length; i += 2)
prettyJson.push( title: list[i], price: list[i + 1] );
return prettyJson;
const json = ["\n Rolex Submariner 5513 Maxi MK5 Dial","\n \n \n 16 000 €\n ","\n Rolex Submariner Black Dial Date 41mm - 2021 - 126610LN","\n \n \n 14 839 €\n ","\n Rolex Black Dial Submariner Date 41mm - 2021 Card - 126610ln","\n \n \n 14 839 €\n ","\n Rolex Submariner Meter First MK1","\n \n \n 15 416 €\n ","\n Rolex Submariner 16610 military NATO 1994 S series","\n \n \n 35 000 €\n ","\n Rolex Submariner 126610LV Starbucks NEW 06/2021 Full set","\n \n \n 17 400 €\n ","\n Rolex 06/2021 - Submariner Date 126610 LN 99%new","\n \n \n 13 300 €\n ","\n Rolex Submariner 6536 Gilt James Bond 1956","\n \n \n 33 000 €\n ","\n Rolex Submariner Date Starbucks Automatik Edelstahl Herrenuhr...","\n \n \n 17 770 €\n ","\n Rolex Submariner","\n \n \n 12 500 €\n ","\n Rolex Submariner Date NOS avec stickers","\n \n \n 17 900 €\n ","\n Rolex Submariner 5513 \"Meter first\"","\n \n \n 16 000 €\n ","\n Rolex Submariner","\n \n \n 9 700 €\n ","\n Rolex Submariner 16610LV Kermit Y series 2003 Fat Four Mark 1...","\n \n \n 38 000 €\n ","\n Rolex Submariner Date 116610LN Boite/Papiers 2020","\n \n \n 13 790 €\n ","\n Rolex NEW 2021 some stickers - Submariner No Date 124060","\n \n \n 12 490 €\n ","\n Rolex Submariner 14060M Full Set","\n \n \n 10 900 €\n ","\n Rolex Submariner Date 18K Gold Automatik Herrenuhr Oyster...","\n \n \n 27 240 €\n ","\n Rolex \"Submariner \"\"Hulk\"\"\"Model 116610LV Full Set 2017","\n \n \n 19 950 €\n ","\n Rolex Submariner Date 116619LB Rolex Serviced 2017","\n \n \n 36 500 €\n ","\n Rolex Submariner 5513 Feet First","\n \n \n 16 000 €\n ","\n Rolex Submariner","\n \n \n 12 900 €\n ","\n Rolex Submariner 5513 Maxi dial 1979","\n \n \n 19 000 €\n ","\n Rolex Submariner Date 16610 Boite / Papiers","\n \n \n 11 750 €\n ","\n Rolex Mint 2021 KERMIT / STARBUCKS - Submariner Date 126610 LV...","\n \n \n 17 500 €\n ","\n Rolex Submariner 41 No-Date - 124060 - Full Set - 2021","\n \n \n 12 900 €\n ","\n Rolex Submariner Date Stahl / Gold Automatik Herrenuhr Oyster...","\n \n \n 9 550 €\n ","\n Rolex Submariner (No Date) 14060M 2 Lines Full set 2005","\n \n \n 11 200 €\n ","\n Rolex Submariner Date 41mm NEW 09/2021","\n \n \n 14 500 €\n ","\n Rolex Submariner 16610LV \"Kermit\"","\n \n \n 17 500 €\n ","\n Rolex Submariner Céramique 40mm","\n \n \n 12 900 €\n ","\n Rolex Submariner 5513 Gilt Glossy 1966 Rolex warranty","\n \n \n 48 000 €\n ","\n Rolex Submariner 14060M Boite / Papiers","\n \n \n 11 450 €\n ","\n Rolex Submariner date - Oyster Perpetual","\n \n \n 18 000 €\n ","\n Rolex Submariner Date - 116610LN- Full Set - 2012","\n \n \n 12 500 €\n ","\n Rolex Submariner No Date Automatik Stahl Oyster Perpetual Ref....","\n \n \n 10 650 €\n ","\n Rolex Submariner 116610 \"Hulk\" 2010 SERIE G FULL SET STICKERS","\n \n \n 22 500 €\n ","\n Rolex Submariner Date Or Blanc 41mm New 07/2021","\n \n \n 43 900 €\n ","\n Rolex Submariner Date 2000 Full set","\n \n \n 10 800 €\n ","\n Rolex Submariner","\n \n \n 11 900 €\n ","\n Rolex Submariner 16610 COMEX M series full set 2008","\n \n \n 89 000 €\n ","\n Rolex Submariner Date Purple dial","\n \n \n 12 290 €\n ","\n Rolex Submariner (No Date)","\n \n \n 11 000 €\n ","\n Rolex Submariner 5508 Tropical James Bond - 1958","\n \n \n 26 000 €\n ","\n Rolex Submariner Date Kermit Automatik Stahl Herrenuhr Ref....","\n \n \n 16 950 €\n ","\n Rolex montre rolex 5513 submariner 39 mm automatique en acier...","\n \n \n 11 120 €\n ","\n Rolex Submariner \"Kermit\"1661OLV","\n \n \n 17 000 €\n ","\n Rolex Submariner Date 1996 série W Full set","\n \n \n 10 900 €\n ","\n Rolex Submariner","\n \n \n 11 900 €\n ","\n Rolex Submariner 16610 S series 1994 tritium from Hawaii","\n \n \n 14 900 €\n ","\n Rolex Submariner Date Mk1 military NATO rare country code 905...","\n \n \n 13 290 €\n ","\n Rolex Submariner Date","\n \n \n 15 000 €\n ","\n Rolex Submariner 5513","\n \n \n 12 500 €\n ","\n Rolex Submariner Date Stahl / Gold Automatik Oyster Perpetual...","\n \n \n 14 250 €\n ","\n Rolex submariner 16613t 40 mm automatique or & acier gold new...","\n \n \n 12 845 €\n ","\n Rolex Submariner Date de 1988","\n \n \n 8 900 €\n ","\n Rolex Submariner No Date 14060 4 Lignes 2009 Full Set","\n \n \n 12 000 €\n ","\n Rolex Submariner \"Kermit\"","\n \n \n 17 000 €\n ","\n Rolex Submariner","\n \n \n 9 600 €\n ","\n Rolex Submariner Date 116613 LN","\n \n \n 13 500 €\n ","\n Rolex Submariner Date Blue Dial 40mm Gold steel FULL SET","\n \n \n 12 980 €\n ","\n Rolex Submariner No Date Stickers - 124060 - Full Set - 2020","\n \n \n 12 500 €\n ","\n Rolex Submariner Stahl / Gold Automatik Herrenuhr Ref....","\n \n \n 16 020 €\n ","\n Rolex Submariner Date","\n \n \n 11 150 €\n "];
console.log(jsonToPrettyJson(json));
输出：
title: 'Rolex Submariner Stahl / Gold Automatik Herrenuhr Ref....',
price: '16 020 €'
,
title: 'Rolex Submariner Date', price: '11 150 €'
...
【讨论】：
非常感谢 - 但是，我在运行时收到“(node:1636) UnhandledPromiseRejectionWarning: ReferenceError: json is not defined”错误 - 知道为什么吗？ 也许我没有把你的代码放在正确的地方，是不是就在let data = JSON.stringify(Array1);上方？谢谢！
@Victor jsonToPrettyJson 函数是同步的，它与承诺无关。确保在 promise 得到解决并获取数据后调用该函数。【参考方案2】：
Array1.push(title: $(e).text());
Array1.push(price: $(e).text());
你应该把键和它们的值放在对象中，然后把它放在数组中。 您将值放入 title 变量中，然后将其传递给数组 所以它替换为它们的值而不是单词：“title”等等......
【讨论】：
这行得通！非常感谢！！！当我在 HTML 表格中显示时，我得到了很多“未定义”的单元格，但我会找到一种方法来删除我猜的 :) 太棒了...主要问题是围绕制作变量而不是字符串（在组成对象时），然后将信息放入其中。感谢您发现它有用，请选择此回复作为答案以上是关于JSON输出与Node JS一团糟的主要内容，如果未能解决你的问题，请参考以下文章
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