如何使用 JS 從 JSON 文檔中提取值

Question

我在使用 JSON 和 JS 時非常新，所以我遇到了一個問題，我正在嘗試獲取對象附件 [{path = "..."}] 中的值，但由於我不這樣做，我得到了多個錯誤真的不知道該怎么做。

這是我的 JSON：

[{ "from": [{ "address": "luis@gmail.com", "name": "Luis " }], "date": "2022-06-16T14:01:08.000Z", "receivedDate": "2022-06-16T14:01:26.000Z", "to": [{ "address": "luis.@ton.edu.co", "name": "" }], "subject": "Facturacion electronica", "text": "\n", "textPlain": "\n", "hasAttachment": true, "original": { "body": "<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\" /><div dir=\"ltr\"><div class=\"gmail_default\" style=\"font-family:arial,helvetica,sans-serif;font-size:large\"><br></div></div>\n", "headers": { "received": ["from DM5PR1301MB2218.namprd13.prod.outlook.com (2603:10b6:4:30::30) by MN2PR13MB3693.namprd13.prod.outlook.com with HTTPS; Thu, 16 Jun 2022 14:01:26 +0000", "from SN4PR0201CA0046.namprd02.prod.outlook.com (2603:10b6:803:2e::32) by DM5PR1301MB2218.namprd13.prod.outlook.com (2603:10b6:4:30::30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5353.11; Thu, 16 Jun 2022 14:01:23 +0000", "from SN1NAM02FT0046.eop-nam02.prod.protection.outlook.com (2603:10b6:803:2e:cafe::73) by SN4PR0201CA0046.outlook.office365.com (2603:10b6:803:2e::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5353.14 via Frontend Transport; Thu, 16 Jun 2022 14:01:23 +0000", "from mail-pg1-f182.google.com (209.85.215.182) by SN1NAM02FT0046.mail.protection.outlook.com (10.97.5.4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5353.14 via Frontend Transport; Thu, 16 Jun 2022 14:01:22 +0000", "by mail-pg1-f182.google.com with SMTP id d129so1314505pgc.9 for <luis.villalba.9677@miremington.edu.co>; Thu, 16 Jun 2022 07:01:22 -0700 (PDT)"], "authentication-results": "spf=pass (sender IP is 209.85.215.182) smtp.mailfrom=gmail.com; dkim=pass (signature was verified) header.d=gmail.com;dmarc=pass action=none header.from=gmail.com;compauth=pass reason=100", "received-spf": "Pass (protection.outlook.com: domain of gmail.com designates 209.85.215.182 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.215.182; helo=mail-pg1-f182.google.com; pr=C", "dkim-signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=vQCl0MdNDi0YVPYmwIcLob2sZQ71Mebd3Yrxzhr2nV8=; b=hOasXO3PARCRh6q+OUeBy9jgqQMeCXFnFtqECYaqBHWLIMMEhmsEASC3TgBGD/e2aT ssZZWLPMebxtvH/MlywEDSpAT7XIaEPdng94OXrUeIFc3LeGwxc9XYpVqM4AYn3fIGko cxP9anbIq+X4a0wP5h8QZha4lR4ljPlsVFwk9vNMeEsjxcvdpeUR0wgFo2S5jLYx6dIp UoNKHM5+jtcYLvIozU9Jyo0SjZhTy6HjEQGBgLCq2qgliCsrJdr2U2jg1KvMfgCwe/ML sfsyCxxicz3k5vd7alNEui1sbCEvNw8NnKjOyuXygKQo3DOvDrR3sO4DGOpjaJTMUjlt nqsA==", "x-google-dkim-signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=vQCl0MdNDi0YVPYmwIcLob2sZQ71Mebd3Yrxzhr2nV8=; b=CDJrrRsU7P8GE+Wt91DoNru2dF7J2CBccSM7ST/dy+N7DJ3laHstwWF4qGcc/jdHXb yKDcUnA8tEH+SAlI+qMSVh2w60uyT7kVMKqMp9Pxf6oUj3ARanktSic0aZcVr/HN9kfh cu4FcU8AlUl+dSNg+dQ8fbmjvinuiMk1o2NG08HiXq9H5NQDMrss70sU7LA+yHqp0j9r +FrpsyAPlki58Kfj7MonmoqBSm9P5MCxVDRDp/N8lz0KCpMor5mXIUsb3Qb0F9YY97Ly 1Dfu31FmBSD2iVcYQ73xyEcpFNLRk22PiHHfBjmtkggRm5HvcPeqE8irblzRSP5zQoLX RAVw==", "x-gm-message-state": "AJIora+bCFuSkz5hlTY5ZdIyetiVpD0KGMzS4fcKCNGoEhA2qgQ9vp1G LtSF7qtu89FIJkcLfM3fasLPL8YL2M8KURKW5DCFUgbcurU=", "x-google-smtp-source": "AGRyM1vNXatnK7wAXbgyqbI4O/wuFK+BQ3cfP1jz3ra3mzWl/22XO5Q4YDaFGEZ4aq0pRFI/bFjqHnOWBWd1NauKNfo=", "x-received": "by 2002:a63:1b53:0:b0:3fd:168e:d9a with SMTP id b19-20020a631b53000000b003fd168e0d9amr4681929pgm.617.1655388081210; Thu, 16 Jun 2022 07:01:21 -0700 (PDT)", "from": "Luis  <luis@gmail.com>", "date": "Thu, 16 Jun 2022 09:01:08 -0500", "message-id": "<CAL0BCDnijtvACn6Y408hX6+XDRih6zKg+td6digWxcT7khWrBA@mail.gmail.com>", "subject": "Facturacion electronica", "to": "luis@ton.edu.co", "content-type": "multipart/mixed; boundary=\"0000000000008bea1805e191122e\"", "return-path": "luis@gmail.com", "x-ms-exchange-organization-expirationstarttime": "16 Jun 2022 14:01:22.8465 (UTC)", "x-ms-exchange-organization-expirationstarttimereason": "OriginalSubmit", "x-ms-exchange-organization-expirationinterval": "1:00:00:00.0000000", "x-ms-exchange-organization-expirationintervalreason": "OriginalSubmit", "x-ms-exchange-organization-network-message-id": "08cd21ef-317f-4b77-cff7-08da4fa0b224", "x-eopattributedmessage": "0", "x-eoptenantattributedmessage": "3855fd0e-2e9a-4fcc-9552-878a0fe4a05d:0", "x-ms-exchange-organization-messagedirectionality": "Incoming", "x-ms-publictraffictype": "Email", "x-ms-exchange-organization-authsource": "SN1NAM02FT0046.eop-nam02.prod.protection.outlook.com", "x-ms-exchange-organization-authas": "Anonymous", "x-ms-office365-filtering-correlation-id": "08cd21ef-317f-4b77-cff7-08da4fa0b224", "x-ms-traffictypediagnostic": "DM5PR1301MB2218:EE_", "x-ms-exchange-organization-scl": "1", "x-microsoft-antispam": "BCL:0;", "x-forefront-antispam-report": "CIP:209.85.215.182;CTRY:US;LANG:es;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail-pg1-f182.google.com;PTR:mail-pg1-f182.google.com;CAT:NONE;SFS:(13230016)(84050400002)(42186006)(1096003)(4006050)(6916009)(5660300002)(76482006)(356005)(7636003)(21480400003)(8676002)(86362001)(7596003)(7116003)(21470400002)(75640400001)(73392003)(55446002)(33964004)(26005)(336012)(82202003)(3480700007)(6666004)(564344004)(563144003);DIR:INB;", "x-ms-exchange-crosstenant-originalarrivaltime": "16 Jun 2022 14:01:22.7840 (UTC)", "x-ms-exchange-crosstenant-network-message-id": "08cd21ef-317f-4b77-cff7-08da4fa0b224", "x-ms-exchange-crosstenant-id": "3855fd0e-2e9a-4fcc-9552-878a0fe4a05d", "x-ms-exchange-crosstenant-authsource": "SN1NAM02FT0046.eop-nam02.prod.protection.outlook.com", "x-ms-exchange-crosstenant-authas": "Anonymous", "x-ms-exchange-crosstenant-fromentityheader": "Internet", "x-ms-exchange-transport-crosstenantheadersstamped": "DM5PR1301MB2218", "x-ms-exchange-transport-endtoendlatency": "00:00:03.4778129", "x-ms-exchange-processed-by-bccfoldering": "15.20.5353.014", "x-microsoft-antispam-mailbox-delivery": "ucf:0;jmr:0;auth:0;dest:I;ENG:(910001)(944506458)(944626604)(920097)(930097);", "x-microsoft-antispam-message-info": "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", "mime-version": "1.0" } }, "uid": "2243", "attachments": [{ "path": "C:\\Users\\usuario\\Desktop\\ioio\\Proyectos\\ioio\\2022-06-16\\1655388696749.oioio.zip" }] }]

附件部分位於 JSON 的末尾，這就是我從 JS 中嘗試的

const jsonData = require('./prueba.json');
var strngJson = JSON.parse(JSON.stringify(jsonData))
console.log(strngJson)
console.log(jsonData.attachments.path);
//console.log(data.attachments.path[0]);

正如我所說，我對 JS 真的很陌生； 兒子對它如何工作的任何解釋，將不勝感激！ 非常感謝

Answer 1

我認為您的問題是您從該 json 中獲取了一個數組，然后您又遇到了同樣的問題，我的意思是附件是另一個數組。 因此，您必須執行以下操作：

const jsonData = require("./prueba.json");
var strngJson = JSON.parse(JSON.stringify(jsonData));
console.log(strngJson);
console.log(strngJson[0].attachments[0].path);