获取youtube视频其实有两种

1、youtube公共api（不需要ApiKey）
2、GoogleDevelopers平台（需要ApiKey）

youtube公共api

请求地址

http://youtube.com/get_video_info?video_id=${id}

请求返回的内容

adaptive_fmts=bitrate%3D1783360%26index%3D714-2917%26size%3D1280x720%26itag%3D136%26xtags%3D%26lmt%3D1517546482525371%26url%3Dhttps%253A%252F%252Fr1---sn-i3b7kn76.googlevideo.com%252Fvideoplayback%253Fkey%253Dyt6%2526signature%253D41B97CEAE18453A563E0DFA05B362DAD59E220C3.758A9F00E2381D173046B69FCA5168DE565E5536%2526mime%253Dvideo%25252Fmp4%2526pl%253D24%2526sparams%253Daitags%25252Cclen%25252Cdur%25252Cei%25252Cgir%25252Cid%25252Cinitcwndbps%25252Cip%25252Cipbits%25252Citag%25252Ckeepalive%25252Clmt%25252Cmime%25252Cmm%25252Cmn%25252Cms%25252Cmv%25252Cpl%25252Crequiressl%25252Csource%25252Cexpire%2526initcwndbps%253D1361250%2526ipbits%253D0%2526expire%253D1521810932%2526lmt%253D1517546482525371%2526fvip%253D4%2526aitags%253D133%25252C134%25252C135%25252C136%25252C160%25252C242%25252C243%25252C244%25252C247%25252C278%2526c%253DWEB%2526mn%253Dsn-i3b7kn76%25252Csn-npoe7n7z%2526mm%253D31%25252C26%2526gir%253Dyes%2526dur%253D963.766%2526id%253Do-AO5RKni5emCWOHKqXQzO28ytVLEVE4CBDpAvcNUfTp4e%2526clen%253D131481856%2526source%253Dyoutube%2526mv%253Dm%2526mt%253D1521789225%2526ms%253Dau%25252Conr%2526keepalive%253Dyes%2526ip%253D47.52.237.194%2526itag%253D136%2526requiressl%253Dyes%2526ei%253DlKm0Wq_9B4-ogAP356PgDw%26type%3Dvideo%252Fmp4%253B%2Bcodecs%253D%2522avc1.4d401f%2522%26quality_label%3D720p%26projection_type%3D1%26fps%3D30%26clen%3D131481856%26init%3D0-713%2Cbitrate%3D1515061%26index%3D226-3450%26size%3D1280x720%26itag%3D247%26xtags%3D%26lmt%3D1517548606804708%26url%3Dhttps%253A%252F%252Fr1---sn-i3b7kn76.googlevideo.com%252Fvideoplayback%253Fkey%253Dyt6%2526signature%253D7D60C4EAA66DE22F796AA98FE424B9088822550D.AC3426FCE8E4CDDC43800CB15791DFC25D9B9338%2526mime%253Dvideo%25252Fwebm%2526pl%253D24%2526sparams%253Daitags%25252Cclen%25252Cdur%25252Cei%25252Cgir%25252Cid%25252Cinitcwndbps%25252Cip%25252Cipbits%25252Citag%25252Ckeepalive%25252Clmt%25252Cmime%25252Cmm%25252Cmn%25252Cms%25252Cmv%25252Cpl%25252Crequiressl%25252Csource%25252Cexpire%2526initcwndbps%253D1361250%2526ipbits%253D0%2526expire%253D1521810932%2526lmt%253D1517548606804708%2526fvip%253D4%2526aitags%253D133%25252C134%25252C135%25252C136%25252C160%25252C242%25252C243%25252C244%25252C247%25252C278%2526c%253DWEB%2526mn%253Dsn-i3b7kn76%25252Csn-npoe7n7z%2526mm%253D31%25252C26%2526gir%253Dyes%2526dur%253D963.766%2526id%253Do-AO5RKni5emCWOHKqXQzO28ytVLEVE4CBDpAvcNUfTp4e%2526clen%253D135557746%2526source%253Dyoutube%2526mv%253Dm%2526mt%253D1521789225%2526ms%253Dau%25252Conr%2526keepalive%253Dyes%2526ip%253D47.52.237.194%2526itag%253D247%2526requiressl%253Dyes%2526ei%253DlKm0Wq_9B4-ogAP356PgDw%26type%3Dvideo%252Fwebm%253B%2Bcodecs%253D%2522vp9%2522%26quality_label%3D720p%26projection_type%3D1%26fps%3D30%26clen%3D135557746%26init%3D0-225%2Cbitrate%3D1612051%26index%3D715-2918%26size%3D854x480%26itag%3D135%26xtags%3D%26lmt%3D1517546332727535%26url%3Dhttps%253A%252F%252Fr1---sn-i3b7kn76.googlevideo.com%252Fvideoplayback%253Fkey%253Dyt6%2526signature%253D8C740472DEE6F7C7F8894DDD2E4DB44D04793CC7.9EB8113CE286447E9E3D28459CEC833E8DE8D565%2526mime%253Dvideo%25252Fmp4%2526pl%253D24%2526sparams%253Daitags%25252Cclen%25252Cdur%25252Cei%25252Cgir%25252Cid%25252Cinitcwndbps%25252Cip%25252Cipbits%25252Citag%25252Ckeepalive%25252Clmt%25252Cmime%25252Cmm%25252Cmn%25252Cms%25252Cmv%25252Cpl%25252Crequiressl%25252Csource%25252Cexpire%2526initcwndbps%253D1361250%2526ipbits%253D0%2526expire%253D1521810932%2526lmt%253D1517546332727535%2526fvip%253D4%2526aitags%253D133%25252C134%25252C135%25252C136%25252C160%25252C242%25252C243%25252C244%25252C247%25252C278%2526c%253DWEB%2526mn%253Dsn-i3b7kn76%25252Csn-npoe7n7z%2526mm%253D31%25252C26%2526gir%253Dyes%2526dur%253D963.766%2526id%253Do-AO5RKni5emCWOHKqXQzO28ytVLEVE4CBDpAvcNUfTp4e%2526clen%253D92161752%2526source%253Dyoutube%2526mv%253Dm%2526mt%253D1521789225%2526ms%253Dau%25252Conr%2526keepalive%253Dyes%2526ip%253D47.52.237.194%2526itag%253D135%2526requiressl%253Dyes%2526ei%253DlKm0Wq_9B4-ogAP356PgDw%26type%3Dvideo%252Fmp4%253B%2Bcodecs%253D%2522avc1.4d401f%2522%26quality_label%3D480p%26projection_type%3D1%26fps%3D30%26clen%3D92161752%26init%3D0-714%2Cbitrate%3D772884%26index%3D226-3432%26size%3D854x480%26itag%3D244%26xtags%3D%26lmt%3D1517548733093977%26url%3Dhttps%253A%252F%252Fr1---sn-i3b7kn76.googlevideo.com%252Fvideoplayback%253Fkey%253Dyt6%2526signature%253D43BBCDCE35313F4D4A8E9EF6F7F599EBEAEF9E4E.76BCA80C096946ECBB46A54707A97FD0A007C19F%2526mime%253Dvideo%25252Fwebm%2526pl%253D24%2526sparams%253Daitags%25252Cclen%25252Cdur%25252Cei%25252Cgir%25252Cid%25252Cinitcwndbps%25252Cip%25252Cipbits%25252Citag%25252Ckeepalive%25252Clmt%25252Cmime%25252Cmm%25252Cmn%25252Cms%25252Cmv%25252Cpl%25252Crequiressl%25252Csource%25252Cexpire%2526initcwndbps%253D1361250%2526ipbits%253D0%2526expire%253D1521810932%2526lmt%253D1517548733093977%2526fvip%253D4%2526aitags%253D133%25252C134%25252C135%25252C136%25252C160%25252C242%25252C243%25252C244%25252C247%25252C278%2526c%253DWEB%2526mn%253Dsn-i3b7kn76%25252Csn-npoe7n7z%2526mm%253D31%25252C26%252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需要进行解码

观察返回结果，仔细分析后，发现需要解码才能进行下一步工作，解码的大致思路：

1、用 & 将query字段分开
2、再通过= 将其分开 用decodeURIComponent分别进行解码操作
3、转为数组

       const content = '返回的结果'const lines = split('&')const val = {}for (const line of lines) {let [left, right] = line.split('=')right = decodeURIComponent(right)val[left] = right}

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'10_13_3',iv_load_policy: '1',videostats_playback_base_url: 'https://s.youtube.com/api/stats/playback?len=964&of=Vlmb4PaTIvVmW2VR0AZ2Tw&cl=189937396&vm=CAEQABgB&docid=LPljK07-F2U&plid=AAVoDzCR4Tcn00Vv&el=embedded&fexp=23708904%2C23708906%2C23708910%2C23710476%2C23712544%2C23713711%2C23716256%2C23716972%2C23721698%2C23721753%2C23721898%2C23721992%2C23723618%2C23724492%2C23724833%2C23725948%2C23726102%2C23726354%2C23726568%2C23726633%2C23726797%2C23727194%2C23729397%2C23729689%2C23731309%2C23731442%2C23732086%2C23733221%2C23733511%2C23733586%2C9422596%2C9431754%2C9441347%2C9449243%2C9463578%2C9469037%2C9471239%2C9474360%2C9475679%2C9485000%2C9486106&ei=lKm0Wq_9B4-ogAP356PgDw&ns=yt',atc: 'a=3&b=SWqemEDp0domwZZCAGlh4B3gSHk&c=1521789332&d=1&e=LPljK07-F2U&c3a=18&c1a=1&c6a=1&hh=5C_mGEqjPRFok27XDVnGZkQnPE-wnEjUYZ6h-kOt-5M',player_response: '{"playbackTracking":{},"captions":{"playerCaptionsTracklistRenderer":{"captionTracks":[{"baseUrl":"https://www.youtube.com/api/timedtext?key=yttt1\\u0026expire=1521814532\\u0026asr_langs=pt%2Ces%2Cru%2Cnl%2Cde%2Cko%2Cit%2Cen%2Cja%2Cfr\\u0026sparams=asr_langs%2Ccaps%2Cv%2Cexpire\\u0026signature=C74D02BF563E2D5BCD2A7250929AB2E28C6B3BF3.70B018EFE2B36AC0C7ACD8466571D613E5499D42\\u0026hl=zh_CN\\u0026v=LPljK07-F2U\\u0026caps=asr\\u0026kind=asr\\u0026lang=en","name":{"simpleText":"英语+(自动生成)"},"vssId":"a.en","languageCode":"en","kind":"asr","isTranslatable":true},{"baseUrl":"https://www.youtube.com/api/timedtext?key=yttt1\\u0026expire=1521814532\\u0026asr_langs=pt%2Ces%2Cru%2Cnl%2Cde%2Cko%2Cit%2Cen%2Cja%2Cfr\\u0026sparams=asr_langs%2Ccaps%2Cv%2Cexpire\\u0026signature=C74D02BF563E2D5BCD2A7250929AB2E28C6B3BF3.70B018EFE2B36AC0C7ACD8466571D613E5499D42\\u0026hl=zh_CN\\u0026v=LPljK07-F2U\\u0026caps=asr\\u0026lang=en","name":{"simpleText":"英语"},"vssId":".en","languageCode":"en","isTranslatable":true}],"audioTracks":[{"captionTrackIndices":[1,0],"visibility":"UNKNOWN"}],"translationLanguages":[{"languageCode":"sq","languageName":{"simpleText":"阿尔巴尼亚语"}},{"languageCode":"ar","languageName":{"simpleText":"阿拉伯语"}},{"languageCode":"am","languageName":{"simpleText":"阿姆哈拉语"}},{"languageCode":"az","languageName":{"simpleText":"阿塞拜疆语"}},{"languageCode":"ga","languageName":{"simpleText":"爱尔兰语"}},{"languageCode":"et","languageName":{"simpleText":"爱沙尼亚语"}},{"languageCode":"eu","languageName":{"simpleText":"巴斯克语"}},{"languageCode":"be","languageName":{"simpleText":"白俄罗斯语"}},{"languageCode":"bg","languageName":{"simpleText":"保加利亚语"}},{"languageCode":"is","languageName":{"simpleText":"冰岛语"}},{"languageCode":"pl","languageName":{"simpleText":"波兰语"}},{"languageCode":"bs","languageName":{"simpleText":"波斯尼亚语"}},{"languageCode":"fa","languageName":{"simpleText":"波斯语"}},{"languageCode":"da","languageName":{"simpleText":"丹麦语"}},{"languageCode":"de","languageName":{"simpleText":"德语"}},{"languageCode":"ru","languageName":{"simpleText":"俄语"}},{"languageCode":"fr","languageName":{"simpleText":"法语"}},{"languageCode":"fil","languageName":{"simpleText":"菲律宾语"}},{"languageCode":"fi","languageName":{"simpleText":"芬兰语"}},{"languageCode":"km","languageName":{"simpleText":"高棉语"}},{"languageCode":"ka","languageName":{"simpleText":"格鲁吉亚语"}},{"languageCode":"gu","languageName":{"simpleText":"古吉拉特语"}},{"languageCode":"kk","languageName":{"simpleText":"哈萨克语"}},{"languageCode":"ht","languageName":{"simpleText":"海地克里奥尔语"}},{"languageCode":"ko","languageName":{"simpleText":"韩语"}},{"languageCode":"ha","languageName":{"simpleText":"豪萨语"}},{"languageCode":"nl","languageName":{"simpleText":"荷兰语"}},{"languageCode":"gl","languageName":{"simpleText":"加利西亚语"}},{"languageCode":"ca","languageName":{"simpleText":"加泰罗尼亚语"}},{"languageCode":"cs","languageName":{"simpleText":"捷克语"}},{"languageCode":"kn","languageName":{"simpleText":"卡纳达语"}},{"languageCode":"ky","languageName":{"simpleText":"柯尔克孜语"}},{"languageCode":"xh","languageName":{"simpleText":"科萨语"}},{"languageCode":"co","languageName":{"simpleText":"科西嘉语"}},{"languageCode":"hr","languageName":{"simpleText":"克罗地亚语"}},{"languageCode":"ku","languageName":{"simpleText":"库尔德语"}},{"languageCode":"la","languageName":{"simpleText":"拉丁语"}},{"languageCode":"lv","languageName":{"simpleText":"拉脱维亚语"}},{"languageCode":"lo","languageName":{"simpleText":"老挝语"}},{"languageCode":"lt","languageName":{"simpleText":"立陶宛语"}},{"languageCode":"lb","languageName":{"simpleText":"卢森堡语"}},{"languageCode":"ro","languageName":{"simpleText":"罗马尼亚语"}},{"languageCode":"mt","languageName":{"simpleText":"马耳他语"}},{"languageCode":"mr","languageName":{"simpleText":"马拉地语"}},{"languageCode":"mg","languageName":{"simpleText":"马拉加斯语"}},{"languageCode":"ml","languageName":{"simpleText":"马拉雅拉姆语"}},{"languageCode":"ms","languageName":{"simpleText":"马来语"}},{"languageCode":"mk","languageName":{"simpleText":"马其顿语"}},{"languageCode":"mi","languageName":{"simpleText":"毛利语"}},{"languageCode":"mn","languageName":{"simpleText":"蒙古语"}},{"languageCode":"bn","languageName":{"simpleText":"孟加拉语"}},{"languageCode":"my","languageName":{"simpleText":"缅甸语"}},{"languageCode":"hmn","languageName":{"simpleText":"苗语"}},{"languageCode":"af","languageName":{"simpleText":"南非荷兰语"}},{"languageCode":"st","languageName":{"simpleText":"南索托语"}},{"languageCode":"ne","languageName":{"simpleText":"尼泊尔语"}},{"languageCode":"no","languageName":{"simpleText":"挪威语"}},{"languageCode":"pa","languageName":{"simpleText":"旁遮普语"}},{"languageCode":"pt","languageName":{"simpleText":"葡萄牙语"}},{"languageCode":"ps","languageName":{"simpleText":"普什图语"}},{"languageCode":"ny","languageName":{"simpleText":"齐切瓦语"}},{"languageCode":"ja","languageName":{"simpleText":"日语"}},{"languageCode":"sv","languageName":{"simpleText":"瑞典语"}},{"languageCode":"sm","languageName":{"simpleText":"萨摩亚语"}},{"languageCode":"sr","languageName":{"simpleText":"塞尔维亚语"}},{"languageCode":"si","languageName":{"simpleText":"僧伽罗语"}},{"languageCod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数据有点多，想要研究的可以看看，部分数据由于太长用...省略了。
我们只要图片地址、标题以及Id就可以完成工作了

标题 ： val.title.replace(/\+/g, ' ')
video id：val.video_id
图片地址：val.thumbnail_url

GoogleDevelopers平台

YouTube数据API概述：https://developers.google.com/youtube/v3/getting-started#part
用此方法的话就简单多了，而且想要什么东西就让它给什么东西，上面概述里有讲到part和fields这两个属性。

part 参数标识应为资源返回的属性组。 fields 参数将API响应过滤为仅返回请求的资源部分中的特定属性。

v3请求地址

示例：

https://www.googleapis.com/youtube/v3/videos?id=7lCDEYXw3mM&key=[YOUR_API_KEY]&part=snippet,statistics&fields=items(id,snippet,statistics)

返回参数

{   "kind": "youtube#videoListResponse",   "etag": "\"UCBpFjp2h75_b92t44sqraUcyu0/sDAlsG9NGKfr6v5AlPZKSEZdtqA\"","snippet": [   {  "id": "7lCDEYXw3mM",   "kind": "youtube#video",  "etag": "\"UCBpFjp2h75_b92t44sqraUcyu0/iYynQR8AtacsFUwWmrVaw4Smb_Q\"",   "snippet": {   "publishedAt": "2012-06-20T22:45:24.000Z",   "channelId": "UC_x5XG1OV2P6uZZ5FSM9Ttw",   "title": "Google I/O 101: Q&A On Using Google APIs",   "description": "Antonio Fuentes speaks to us and takes questions on working with Google APIs and OAuth 2.0.",   "thumbnails": {   "default": {   "url": "https://i.ytimg.com/vi/7lCDEYXw3mM/default.jpg"   },   "medium": {   "url": "https://i.ytimg.com/vi/7lCDEYXw3mM/mqdefault.jpg"   },   "high": {   "url": "https://i.ytimg.com/vi/7lCDEYXw3mM/hqdefault.jpg"   }   },   "categoryId": "28"   },   "contentDetails": {   "duration": "PT15M51S",   "aspectRatio": "RATIO_16_9"   },   "statistics": {   "viewCount": "3057",   "likeCount": "25",   "dislikeCount": "0",   "favoriteCount": "17",   "commentCount": "12"   },   "status": {   "uploadStatus": "STATUS_PROCESSED",   "privacyStatus": "PRIVACY_PUBLIC"   }   }   ]
}

通过snippet 获取详情信息相关的参数字段就行了。