underscorejs，其中运算符未按预期工作
[英]underscorejs where operator not working as expected
问题描述
这是album.tracks.items的json内容
[{
"disc_number": 1,
"duration_ms": 220613,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/5dcQ8zP4ruXLGvxvnaqiIR"
},
"href": "https://api.spotify.com/v1/tracks/5dcQ8zP4ruXLGvxvnaqiIR",
"id": "5dcQ8zP4ruXLGvxvnaqiIR",
"is_local": false,
"name": "It Ain't Love (feat. Lil Mo)",
"preview_url": "https://p.scdn.co/mp3-preview/b0b7c4631088cf6c358f3fd2f368621064c81169?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 1,
"type": "track",
"uri": "spotify:track:5dcQ8zP4ruXLGvxvnaqiIR",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/1"
},
{
"disc_number": 1,
"duration_ms": 206173,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/3skhDoiKAW73vulWCRsWjW"
},
"href": "https://api.spotify.com/v1/tracks/3skhDoiKAW73vulWCRsWjW",
"id": "3skhDoiKAW73vulWCRsWjW",
"is_local": false,
"name": "1000 Cigarettes",
"preview_url": "https://p.scdn.co/mp3-preview/157a6131e35c16519ef2a2b306523fc5c5f54dc0?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 2,
"type": "track",
"uri": "spotify:track:3skhDoiKAW73vulWCRsWjW",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/2"
},
{
"disc_number": 1,
"duration_ms": 171226,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/0u33BbRnsU2TCZyJaQ1NH3"
},
"href": "https://api.spotify.com/v1/tracks/0u33BbRnsU2TCZyJaQ1NH3",
"id": "0u33BbRnsU2TCZyJaQ1NH3",
"is_local": false,
"name": "Bounce (feat. Nore and Isis)",
"preview_url": "https://p.scdn.co/mp3-preview/2379a2e8849111c4a2faa1abddf273ba51711584?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 3,
"type": "track",
"uri": "spotify:track:0u33BbRnsU2TCZyJaQ1NH3",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/3"
},
{
"disc_number": 1,
"duration_ms": 219333,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/2REmc7SO87Ex6MtPQPafLl"
},
"href": "https://api.spotify.com/v1/tracks/2REmc7SO87Ex6MtPQPafLl",
"id": "2REmc7SO87Ex6MtPQPafLl",
"is_local": false,
"name": "Vuvuvu",
"preview_url": "https://p.scdn.co/mp3-preview/c996b13cf701175ce75d2a1ba4f1f8d54ff1b090?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 4,
"type": "track",
"uri": "spotify:track:2REmc7SO87Ex6MtPQPafLl",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/4"
},
{
"disc_number": 1,
"duration_ms": 192853,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/7d5Rp5q6XUegGhrIxEXja4"
},
"href": "https://api.spotify.com/v1/tracks/7d5Rp5q6XUegGhrIxEXja4",
"id": "7d5Rp5q6XUegGhrIxEXja4",
"is_local": false,
"name": "Heartbreaker",
"preview_url": "https://p.scdn.co/mp3-preview/5f280fbebded1b2ce5320e43f75ac32628ccae00?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 5,
"type": "track",
"uri": "spotify:track:7d5Rp5q6XUegGhrIxEXja4",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/5"
},
{
"disc_number": 1,
"duration_ms": 243840,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/07r3G29bZvODU5Lr0Nk6IZ"
},
"href": "https://api.spotify.com/v1/tracks/07r3G29bZvODU5Lr0Nk6IZ",
"id": "07r3G29bZvODU5Lr0Nk6IZ",
"is_local": false,
"name": "Fist Of God",
"preview_url": "https://p.scdn.co/mp3-preview/9453101e1568b713b0af6c1da4cfabd5d6664f03?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 6,
"type": "track",
"uri": "spotify:track:07r3G29bZvODU5Lr0Nk6IZ",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/6"
},
{
"disc_number": 1,
"duration_ms": 206880,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/66ZmwiF97Zk11pz5Jyfbwr"
},
"href": "https://api.spotify.com/v1/tracks/66ZmwiF97Zk11pz5Jyfbwr",
"id": "66ZmwiF97Zk11pz5Jyfbwr",
"is_local": false,
"name": "So Deep (feat. Jahmal of The Carps)",
"preview_url": "https://p.scdn.co/mp3-preview/6b62f7c210d42b266ac39064d90adf842db33465?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 7,
"type": "track",
"uri": "spotify:track:66ZmwiF97Zk11pz5Jyfbwr",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/7"
},
{
"disc_number": 1,
"duration_ms": 208133,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/4syNWEL0JzzybCfZ9MZHPv"
},
"href": "https://api.spotify.com/v1/tracks/4syNWEL0JzzybCfZ9MZHPv",
"id": "4syNWEL0JzzybCfZ9MZHPv",
"is_local": false,
"name": "Click Click (feat. E-40)",
"preview_url": "https://p.scdn.co/mp3-preview/62b6d3becb7fdabf6d0d706cf2ef273bdc477754?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 8,
"type": "track",
"uri": "spotify:track:4syNWEL0JzzybCfZ9MZHPv",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/8"
},
{
"disc_number": 1,
"duration_ms": 231040,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/5oBKd1jkmrZ6h9FbvdIzDS"
},
"href": "https://api.spotify.com/v1/tracks/5oBKd1jkmrZ6h9FbvdIzDS",
"id": "5oBKd1jkmrZ6h9FbvdIzDS",
"is_local": false,
"name": "Word Up (feat. Ghostface Killah)",
"preview_url": "https://p.scdn.co/mp3-preview/20d1b61b80ded729248f58cfbab178f92b17004a?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 9,
"type": "track",
"uri": "spotify:track:5oBKd1jkmrZ6h9FbvdIzDS",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/9"
},
{
"disc_number": 1,
"duration_ms": 218453,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/6RsIWxNzE82KdYztIT1IK1"
},
"href": "https://api.spotify.com/v1/tracks/6RsIWxNzE82KdYztIT1IK1",
"id": "6RsIWxNzE82KdYztIT1IK1",
"is_local": false,
"name": "Breakaway (feat. Jahmal of The Carps)",
"preview_url": "https://p.scdn.co/mp3-preview/8ea8912ae9bad9936090cee3ad85614142782d2c?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 10,
"type": "track",
"uri": "spotify:track:6RsIWxNzE82KdYztIT1IK1",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/10"
},
{
"disc_number": 1,
"duration_ms": 191560,
"explicit": false,
"external_urls": {
"spotify": "https://open.spotify.com/track/2RYqwivWy9seoylZt6qUmH"
},
"href": "https://api.spotify.com/v1/tracks/2RYqwivWy9seoylZt6qUmH",
"id": "2RYqwivWy9seoylZt6qUmH",
"is_local": false,
"name": "1000 Cigarettes (feat. Freeway)",
"preview_url": "https://p.scdn.co/mp3-preview/0d38c708b8605d60fdaa386c790fe3a7be4cb0e1?cid=774b29d4f13844c495f206cafdad9c86",
"track_number": 11,
"type": "track",
"uri": "spotify:track:2RYqwivWy9seoylZt6qUmH",
"url_path": "http://localhost:5000/music/4tnnrgXBrdF0b4q3lZqL0v/1/11"
}
]
我正在尝试根据disc_number为1和track_number为4的两个条件在上述json数组中获取元素（第四个元素）
req.params.disc_number: 1, req.params.track_number: 4
var _ = require('underscore');
...
var track = _.where(album.tracks.items, {disc_number: req.params.disc_number, track_number: req.params.track_number});
console.log('track: ' + track)
track返回任何内容（ [console] track: ，但应返回第四个元素（此元素）：
{ disc_number: 1,
duration_ms: 293600,
explicit: false,
external_urls:
{ spotify: 'https://open.spotify.com/track/616NBqU3gbjICFB1npf2vg' },
href: 'https://api.spotify.com/v1/tracks/616NBqU3gbjICFB1npf2vg',
id: '616NBqU3gbjICFB1npf2vg',
is_local: false,
name: 'Twilight Galaxy',
preview_url: null,
track_number: 4,
type: 'track',
uri: 'spotify:track:616NBqU3gbjICFB1npf2vg'}
我认为在传递disc_number和track_number时不需要parseInt() 。 _where运算符在我有一个条件之前曾经工作过
不知道怎么了
编辑1：我修复了从代码复制json时的错字（现在有效），但仍然无法正常工作
1 个解决方案
解决方案1
2 2018-03-27 23:24:32
var data = [ { disc_number: 1, duration_ms: 286013, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/0cahtHEywK64NSWqm2SDTi' }, href: 'https://api.spotify.com/v1/tracks/0cahtHEywK64NSWqm2SDTi', id: '0cahtHEywK64NSWqm2SDTi', is_local: false, name: 'Help I\\'m Alive', preview_url: null, track_number: 1, type: 'track', uri: 'spotify:track:0cahtHEywK64NSWqm2SDTi'}, { disc_number: 1, duration_ms: 257413, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/2uxLjFYEoQ7xsqfMPuwTQ9' }, href: 'https://api.spotify.com/v1/tracks/2uxLjFYEoQ7xsqfMPuwTQ9', id: '2uxLjFYEoQ7xsqfMPuwTQ9', is_local: false, name: 'Sick Muse', preview_url: null, track_number: 2, type: 'track', uri: 'spotify:track:2uxLjFYEoQ7xsqfMPuwTQ9'}, { disc_number: 1, duration_ms: 222933, explicit: true, external_urls: { spotify: 'https://open.spotify.com/track/5lVXRLV1LgQgd7kUGt3Mae' }, href: 'https://api.spotify.com/v1/tracks/5lVXRLV1LgQgd7kUGt3Mae', id: '5lVXRLV1LgQgd7kUGt3Mae', is_local: false, name: 'Satellite Mind', preview_url: null, track_number: 3, type: 'track', uri: 'spotify:track:5lVXRLV1LgQgd7kUGt3Mae'}, { disc_number: 1, duration_ms: 293600, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/616NBqU3gbjICFB1npf2vg' }, href: 'https://api.spotify.com/v1/tracks/616NBqU3gbjICFB1npf2vg', id: '616NBqU3gbjICFB1npf2vg', is_local: false, name: 'Twilight Galaxy', preview_url: null, track_number: 4, type: 'track', uri: 'spotify:track:616NBqU3gbjICFB1npf2vg'}, { disc_number: 1, duration_ms: 245280, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/6JhUq57XpJeNMxboI4Ne3S' }, href: 'https://api.spotify.com/v1/tracks/6JhUq57XpJeNMxboI4Ne3S', id: '6JhUq57XpJeNMxboI4Ne3S', is_local: false, name: 'Gold Guns Girls', preview_url: null, track_number: 5, type: 'track', uri: 'spotify:track:6JhUq57XpJeNMxboI4Ne3S'}, { disc_number: 1, duration_ms: 234586, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/4z2xy1UYMu70xCkWudeL96' }, href: 'https://api.spotify.com/v1/tracks/4z2xy1UYMu70xCkWudeL96', id: '4z2xy1UYMu70xCkWudeL96', is_local: false, name: 'Gimme Sympathy', preview_url: null, track_number: 6, type: 'track', uri: 'spotify:track:4z2xy1UYMu70xCkWudeL96'}, { disc_number: 1, duration_ms: 286320, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/5dmGvCOyJi943jZgiMdmDC' }, href: 'https://api.spotify.com/v1/tracks/5dmGvCOyJi943jZgiMdmDC', id: '5dmGvCOyJi943jZgiMdmDC', is_local: false, name: 'Collect Call', preview_url: null, track_number: 7, type: 'track', uri: 'spotify:track:5dmGvCOyJi943jZgiMdmDC'}, { disc_number: 1, duration_ms: 214440, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/3Ecg2M5kzSEzz6tR3fOg6g' }, href: 'https://api.spotify.com/v1/tracks/3Ecg2M5kzSEzz6tR3fOg6g', id: '3Ecg2M5kzSEzz6tR3fOg6g', is_local: false, name: 'Front Row', preview_url: null, track_number: 8, type: 'track', uri: 'spotify:track:3Ecg2M5kzSEzz6tR3fOg6g'}, { disc_number: 1, duration_ms: 266840, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/7Apb2lh3o9cYUUHziHNuNN' }, href: 'https://api.spotify.com/v1/tracks/7Apb2lh3o9cYUUHziHNuNN', id: '7Apb2lh3o9cYUUHziHNuNN', is_local: false, name: 'Blindness', preview_url: null, track_number: 9, type: 'track', uri: 'spotify:track:7Apb2lh3o9cYUUHziHNuNN'}, { disc_number: 1, duration_ms: 253693, explicit: false, external_urls: { spotify: 'https://open.spotify.com/track/73PtlKAy67oP9EGeK1fZPi' }, href: 'https://api.spotify.com/v1/tracks/73PtlKAy67oP9EGeK1fZPi', id: '73PtlKAy67oP9EGeK1fZPi', is_local: false, name: 'Stadium Love', preview_url: null, track_number: 10, type: 'track', uri: 'spotify:track:73PtlKAy67oP9EGeK1fZPi'} ]; var track = _.where(data, {disc_number: 1, track_number: 10}); console.log(JSON.stringify(track))
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> <div id="content"></div>
数据对象中存在语法错误。 缺少}。 而且，首先，它不是有效的JSON，因为JSON应该是字符串，但是它仍然可以与下划线一起使用。
Underscorejs'发现'不能按预期工作
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