这让我非常恼火，它似乎适用于所有人的机器和软件，但出于某种原因，我的node.js返回＆＃34; Undefined＆＃34;当我在console.log中记录数据时。
var fs = require('fs');
fs.readFile('./json.json', function read(err, data) {
if (err) {
throw err;
}
var config = JSON.parse(data);
console.log(config.age);
});
我的json是
[
{
"_id": "55cff321d9ed74fcdb050680",
"index": 0,
"guid": "11b7b82b-9e2c-44ed-a071-e9fc43f82957",
"isActive": false,
"balance": "$2,888.03",
"picture": "http://placehold.it/32x32",
"age": 26,
"eyeColor": "brown",
"name": "Wong Scott",
"gender": "male",
"company": "ROBOID",
"email": "wongscott@roboid.com",
"phone": "+1 (932) 588-3975",
"address": "126 Wakeman Place, Staples, Georgia, 3054",
"about": "Non nisi in veniam irure exercitation quis ipsum voluptate. Fugiat incididunt officia enim enim in ullamco deserunt quis cupidatat anim minim ea id proident. Cillum sit voluptate Lorem incididunt ut fugiat aute occaecat mollit ullamco esse cillum. Magna duis pariatur labore ullamco laboris Lorem deserunt voluptate quis adipisicing fugiat irure. Cupidatat qui commodo adipisicing tempor. Consequat aliqua esse deserunt fugiat ut occaecat eu id id ad. Velit et dolore do culpa in laboris officia nostrud reprehenderit duis.\r\n",
"registered": "2014-02-28T11:16:52 +05:00",
"latitude": 45.928161,
"longitude": 146.414649,
"tags": [
"proident",
"in",
"tempor",
"reprehenderit",
"dolor",
"sit",
"aliqua"
],
"friends": [
{
"id": 0,
"name": "Golden Chase"
},
{
"id": 1,
"name": "Yvonne Conley"
},
{
"id": 2,
"name": "Palmer Lindsey"
}
],
"greeting": "Hello, Wong Scott! You have 2 unread messages.",
"favoriteFruit": "banana"
},
{
"_id": "55cff321ea1689b4f93f53bb",
"index": 1,
"guid": "5565f002-7ca7-46f5-9189-e72770bb0b02",
"isActive": true,
"balance": "$3,160.94",
"picture": "http://placehold.it/32x32",
"age": 34,
"eyeColor": "green",
"name": "Waters Mcgee",
"gender": "male",
"company": "COMVEY",
"email": "watersmcgee@comvey.com",
"phone": "+1 (806) 474-3083",
"address": "817 Chester Avenue, Nanafalia, District Of Columbia, 6666",
"about": "Aliquip dolor ut laborum Lorem ipsum deserunt tempor ullamco ut deserunt. Elit esse pariatur et ex cillum laboris culpa dolore. Laboris nulla non mollit ullamco dolore est officia laboris aliquip irure ad. Voluptate excepteur est exercitation deserunt labore eu sit reprehenderit eiusmod irure proident fugiat do.\r\n",
"registered": "2014-04-05T10:59:32 +04:00",
"latitude": -78.141645,
"longitude": -178.247836,
"tags": [
"aute",
"qui",
"minim",
"culpa",
"laboris",
"quis",
"culpa"
],
"friends": [
{
"id": 0,
"name": "Chan Mathews"
},
{
"id": 1,
"name": "Tamara Drake"
},
{
"id": 2,
"name": "Serena Villarreal"
}
],
"greeting": "Hello, Waters Mcgee! You have 9 unread messages.",
"favoriteFruit": "banana"
},
{
"_id": "55cff3211e916e7859b4a060",
"index": 2,
"guid": "729c0b1a-7056-4beb-9b6c-0b08592acd50",
"isActive": true,
"balance": "$2,204.11",
"picture": "http://placehold.it/32x32",
"age": 29,
"eyeColor": "brown",
"name": "Laurel Reeves",
"gender": "female",
"company": "SNIPS",
"email": "laurelreeves@snips.com",
"phone": "+1 (948) 443-2648",
"address": "224 Thames Street, Brenton, Nebraska, 465",
"about": "Officia Lorem nisi minim esse. Reprehenderit exercitation culpa quis Lorem sunt occaecat fugiat anim aliqua. Consectetur consequat ut proident pariatur anim anim laboris ad. Qui dolore est id tempor ex quis cillum ut incididunt amet duis magna nulla mollit. Laboris fugiat tempor laboris ullamco commodo in sint do exercitation. Quis ex eu velit quis eiusmod magna do et laborum.\r\n",
"registered": "2015-01-13T10:16:04 +05:00",
"latitude": -35.583701,
"longitude": -156.036728,
"tags": [
"nostrud",
"aute",
"dolor",
"exercitation",
"est",
"mollit",
"aliqua"
],
"friends": [
{
"id": 0,
"name": "Wiggins Mcdowell"
},
{
"id": 1,
"name": "Jacobs Anderson"
},
{
"id": 2,
"name": "Obrien Harrington"
}
],
"greeting": "Hello, Laurel Reeves! You have 9 unread messages.",
"favoriteFruit": "banana"
},
{
"_id": "55cff3219a7d55646dca265c",
"index": 3,
"guid": "ba00c623-ff76-493b-96d8-d24750491f53",
"isActive": true,
"balance": "$2,708.00",
"picture": "http://placehold.it/32x32",
"age": 22,
"eyeColor": "brown",
"name": "Becker Becker",
"gender": "male",
"company": "CEPRENE",
"email": "beckerbecker@ceprene.com",
"phone": "+1 (955) 554-2612",
"address": "972 Flatlands Avenue, Sattley, Northern Mariana Islands, 5453",
"about": "Aute consectetur dolore ex labore occaecat. Reprehenderit nulla labore sint quis aliquip. Veniam ipsum consequat incididunt ipsum sint ullamco incididunt id.\r\n",
"registered": "2014-07-23T08:20:56 +04:00",
"latitude": -78.745659,
"longitude": 128.883716,
"tags": [
"labore",
"culpa",
"nostrud",
"labore",
"quis",
"dolor",
"sunt"
],
"friends": [
{
"id": 0,
"name": "Brittany Tran"
},
{
"id": 1,
"name": "Debra Nielsen"
},
{
"id": 2,
"name": "Cheri Melendez"
}
],
"greeting": "Hello, Becker Becker! You have 2 unread messages.",
"favoriteFruit": "banana"
},
{
"_id": "55cff3217d7d4e40c24e4094",
"index": 4,
"guid": "5591dee1-d6f6-4c09-925f-63c16307f4ab",
"isActive": true,
"balance": "$1,360.06",
"picture": "http://placehold.it/32x32",
"age": 31,
"eyeColor": "brown",
"name": "Wheeler Howe",
"gender": "male",
"company": "TEMORAK",
"email": "wheelerhowe@temorak.com",
"phone": "+1 (969) 421-3626",
"address": "801 Suydam Place, Glenbrook, Wyoming, 4669",
"about": "Est mollit tempor ipsum reprehenderit dolor adipisicing quis commodo irure labore deserunt consectetur amet. Officia non qui ex nostrud do pariatur pariatur qui aliqua anim enim deserunt. Laborum consequat reprehenderit quis officia veniam adipisicing dolore veniam officia sunt. Et irure magna laborum irure occaecat commodo in irure sint sit.\r\n",
"registered": "2014-01-30T11:14:52 +05:00",
"latitude": -26.344453,
"longitude": -91.688423,
"tags": [
"anim",
"aute",
"est",
"exercitation",
"amet",
"dolore",
"sit"
],
"friends": [
{
"id": 0,
"name": "Flossie Bernard"
},
{
"id": 1,
"name": "Janette Daniels"
},
{
"id": 2,
"name": "Thomas Hoffman"
}
],
"greeting": "Hello, Wheeler Howe! You have 8 unread messages.",
"favoriteFruit": "apple"
}
]
这可能是JSON问题吗？
请告知。
非常感谢！
答案 0 :(得分：2)
看起来你的json是一个对象数组。
尝试访问数组的第一个元素，然后尝试访问age属性，如下所示
console.log(config[0].age)