原因是看到下面一段代碼有點(diǎn)不明白，所以重新測試了下

var movies = [];for (var idx in moviesDouban.subjects) {//主要是這段代碼不清楚，以為對moviesDouban.subjects循環(huán)就能得到數(shù)組中的每一個(gè)對象，其實(shí)得到的只是下標(biāo)/索引，0、1、2...var subject = moviesDouban.subjects[idx];//獲取title及處理var title = subject.title;if (title.length >= 6) {title = title.substring(0, 6) + "...";}// [1,1,1,1,1] [1,1,1,0,0]var temp = {stars: util.convertToStarsArray(subject.rating.stars),title: title,average: subject.rating.average,coverageUrl: subject.images.large,movieId: subject.id}movies.push(temp) }

我們看數(shù)據(jù)（可以通過postman訪問http://t.yushu.im/v2/movie/in_theaters得到）：

{"count": 14,"start": 0,"subjects": [{"casts": [{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p44501.jpg"},"name": "劉若英"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1452260519.76.jpg"},"name": "井柏然"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p36798.jpg"},"name": "周冬雨"}],"comments_count": 642,"countries": ["中國大陸"],"directors": [{"avatars": {"large": null},"name": "劉若英"}],"genres": ["劇情","愛情"],"id": 326,"images": {"large": "https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2519994468.jpg"},"original_title": "后來的我們","rating": {"average": 7,"max": 10,"min": 0,"stars": "35"},"reviews_count": 119,"summary": "這是一個(gè)愛情故事，關(guān)于一對異鄉(xiāng)漂泊的年輕人。\\n十年前，見清和小曉偶然地相識(shí)在歸鄉(xiāng)過年的火車上。兩人懷揣著共同的夢想，一起在北京打拼，并開始了一段相聚相離的情感之路。\\n十年后，見清和小曉在飛機(jī)上再次偶然重逢……\\n命運(yùn)似乎是一個(gè)輪回。在一次次的偶然下，平行線交叉，再平行，故事始終有“然后”。可后來的他們，學(xué)會(huì)如何去愛了嗎？","title": "后來的我們","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 26250,"year": 2018},{"casts": [{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1520825133.06.jpg"},"name": "任鵬遠(yuǎn)"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p43738.jpg"},"name": "徐崢"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p18662.jpg"},"name": "王麗坤"}],"comments_count": 540,"countries": ["中國大陸"],"directors": [{"avatars": {"large": null},"name": "任鵬遠(yuǎn)"}],"genres": ["劇情","懸疑","犯罪"],"id": 305,"images": {"large": "https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2518645794.jpg"},"original_title": "幕后玩家","rating": {"average": 6.9,"max": 10,"min": 0,"stars": "35"},"reviews_count": 49,"summary": "坐擁數(shù)億財(cái)產(chǎn)的鐘小年(徐崢 飾)意外遭人綁架，不得不在一位神秘人的操控下完 成一道道令人兩難的選擇題。在選擇的過程中，鐘小年落入陷阱，不僅巨額財(cái)產(chǎn)被盜取、 瀕臨身敗名裂的邊緣，還將妻子魏思蒙(王麗坤 飾)牽扯進(jìn)一個(gè)個(gè)險(xiǎn)境。為了洗脫罪名， 救回愛人，鐘小年在重重危機(jī)中與神秘人展開了一場關(guān)乎生死和救贖的金錢游戲…","title": "幕后玩家","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 11432,"year": 2018},{"casts": [{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371547477.26.jpg"},"name": "哈斯朝魯"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1409055274.95.jpg"},"name": "陳偉霆"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1460438693.8.jpg"},"name": "林允"}],"comments_count": 508,"countries": ["中國大陸"],"directors": [{"avatars": {"large": null},"name": "哈斯朝魯"}],"genres": ["奇幻","冒險(xiǎn)"],"id": 313,"images": {"large": "https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2519726014.jpg"},"original_title": "戰(zhàn)神紀(jì)","rating": {"average": 0,"max": 10,"min": 0,"stars": "00"},"reviews_count": 62,"summary": "少年鐵木真(陳偉霆 飾）身為部落首領(lǐng)之子，年幼喪父，母親獨(dú)自將他撫養(yǎng)成人，鐵木真成人之際返回翁吉剌部落迎娶自幼定有婚約的孛爾帖（林允 飾），誰知途中卻逐步陷入叔父（趙立新 飾）設(shè)置的殺戮陷阱，而青梅竹馬的戀人孛爾帖也在新婚之夜被另一部落首領(lǐng)忽出魯（胡軍 飾）擄走，鐵木真在好兄弟札木合（李光潔 飾）的支持與薩滿長老的輔佐下，踏上拯救戀人和守衛(wèi)草原的征途……","title": "戰(zhàn)神紀(jì)","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 5439,"year": 2018},{"casts": [{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1400525104.38.jpg"},"name": "張家輝"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1400525104.38.jpg"},"name": "張家輝"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p20738.jpg"},"name": "徐靜蕾"}],"comments_count": 42,"countries": ["中國大陸","香港"],"directors": [{"avatars": {"large": null},"name": "張家輝"}],"genres": ["劇情","動(dòng)作","懸疑","犯罪"],"id": 314,"images": {"large": "https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2520457270.jpg"},"original_title": "低壓槽：欲望之城 低壓槽","rating": {"average": 0,"max": 10,"min": 0,"stars": "00"},"reviews_count": 6,"summary": "孤城，一座浮華卻墮落的罪惡之城，這里充斥著金錢與利益的爭奪。然而，在這個(gè)亡命之徒的樂園里，仍有少數(shù)人堅(jiān)持著自己心中的正義……\\n警方臥底于秋在上司阿占的運(yùn)籌帷幄下，多次成功打入當(dāng)?shù)貛团?#xff0c;斡旋于多方黑色勢力之中。于秋在黑幫生活中卻好像漸漸迷失自我，他開始懷疑，是否只有“非常”的手段才能主持公正，這讓阿占也開始質(zhì)疑。一次臥底行動(dòng)中，于秋冒著行動(dòng)失敗的風(fēng)險(xiǎn)和幫派老大激戰(zhàn)，結(jié)果全體命喪當(dāng)場。在道德和江湖道義的雙重質(zhì)疑下，于秋選擇了自我放逐，他逃離了孤城。\\n然而，于秋內(nèi)心對懲治罪惡的欲望從未消減，他重整旗鼓回到孤城，而這一次，阿占給他的任務(wù)竟然是調(diào)查罪惡之城背后最邪惡也最神秘的黑手、人人聞之色變的首腦——“老板”。\\n從一宗離奇的小童綁架案開始，于秋和阿占查出老板的身份和他背后的犯罪網(wǎng)絡(luò)。神秘的老板控制了商界和黑道，只有毀滅老板才能拯救這座墮落之城。事實(shí)上，于秋在...","title": "低壓槽：欲望之城 低壓槽","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 3205,"year": 2018},{"casts": [{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1505279964.74.jpg"},"name": "米林宏昌"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1363533549.64.jpg"},"name": "杉咲花"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p13768.jpg"},"name": "神木隆之介"}],"comments_count": 1079,"countries": ["日本"],"directors": [{"avatars": {"large": null},"name": "米林宏昌"}],"genres": ["動(dòng)畫","奇幻","冒險(xiǎn)"],"id": 315,"images": {"large": "https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2519631933.jpg"},"original_title": "瑪麗與魔女之花 メアリと魔女の花","rating": {"average": 6.5,"max": 10,"min": 0,"stars": "35"},"reviews_count": 21,"summary": "改編自瑪麗·斯圖爾特英國兒童文學(xué)小說，瑪麗被送到鄉(xiāng)下阿姨家過暑假，在一只小黑貓的帶領(lǐng)下，她進(jìn)入森林找到一束紫色魔法花，打掃院落時(shí)她用沾有花粉的手碰了掃帚，掃帚突然騰空而起，竟然把她送到森林深處的魔法學(xué)校，在這里她學(xué)習(xí)各種神奇有趣的魔法，但瑪麗也發(fā)現(xiàn)了這所學(xué)校不可告人的秘密。","title": "瑪麗與魔女之花 メアリと魔女の花","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 8696,"year": 2017},{"casts": [{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1419929763.48.jpg"},"name": "陳大利"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1378630537.29.jpg"},"name": "毛舜筠"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1516094049.72.jpg"},"name": "凌文龍"}],"comments_count": 159,"countries": ["中國大陸","香港"],"directors": [{"avatars": {"large": null},"name": "陳大利"}],"genres": ["劇情"],"id": 302,"images": {"large": "https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2520198192.jpg"},"original_title": "黃金花","rating": {"average": 6.4,"max": 10,"min": 0,"stars": "30"},"reviews_count": 13,"summary": "黃金花(毛舜筠 飾)與老公(呂良偉 飾) 合力照顧患有自閉癥的兒子(凌文龍 飾) 20 年，辛苦而重復(fù)的生活讓丈夫背離了本以搖搖欲墜的家庭。面對殘破狼藉的生活，黃金花產(chǎn)生了不計(jì)后果報(bào)復(fù)一切的想法，天真單純的兒子成為她布局的關(guān)鍵點(diǎn)。然而兒子并非對母親的所作所為沒有感知，他沉默的以自己的方式挽回步入歧途母親……面對兒子深沉溫暖的愛，黃金花恍然大悟，但等待她的是光明燦爛的未來又或是無邊痛楚的地獄？","title": "黃金花","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 1912,"year": 2017},{"casts": [{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1432840050.06.jpg"},"name": "布拉德·佩頓"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p196.jpg"},"name": "道恩·強(qiáng)森"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1486878030.07.jpg"},"name": "娜奧米·哈里斯"}],"comments_count": 17021,"countries": ["美國"],"directors": [{"avatars": {"large": null},"name": "布拉德·佩頓"}],"genres": ["動(dòng)作","科幻","冒險(xiǎn)"],"id": 333,"images": {"large": "https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2516079193.jpg"},"original_title": "狂暴巨獸 Rampage","rating": {"average": 6.7,"max": 10,"min": 0,"stars": "35"},"reviews_count": 367,"summary": "巨石強(qiáng)森飾演的靈長類動(dòng)物學(xué)家一直與人類保持距離, 卻跟極為聰明的銀背大猩猩喬治有著深厚的感情。但是一次基因?qū)嶒?yàn)出錯(cuò), 讓這只溫馴的大猩猩變成狂怒難馴的龐然巨獸。更可怕的是, 其他動(dòng)物也發(fā)生了同樣基因異變。他必須阻止這場全球性的災(zāi)難, 更重要是要拯救他的好友喬治。","title": "狂暴巨獸 Rampage","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 10494,"year": 2018},{"casts": [{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p34602.jpg"},"name": "史蒂文·斯皮爾伯格"},{"avatars": {"large": "https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1464678182.3.jpg"},"name": "泰伊·謝里丹"},{"avatars": {"large": "https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p8u95Rxw3ebIcel_avatar_uploaded1365073023.28.jpg"},"name": "奧利維亞·庫克"}],"comments_count": 156940,"countries": ["美國"],"directors": [{"avatars": {"large": null},"name": "史蒂文·斯皮爾伯格"}],"genres": ["動(dòng)作","科幻","冒險(xiǎn)"],"id": 335,"images": {"large": "https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2516578307.jpg"},"original_title": "頭號(hào)玩家 Ready Player One","rating": {"average": 8.9,"max": 10,"min": 0,"stars": "45"},"reviews_count": 4274,"summary": "","title": "頭號(hào)玩家 Ready Player One","warning": "數(shù)據(jù)來源于網(wǎng)絡(luò)整理，僅供學(xué)習(xí)，禁止他用。如有侵權(quán)請聯(lián)系公眾號(hào)：小樓昨夜又秋風(fēng)。我將及時(shí)刪除。","wish_count": 54245,"year": 2018}],"total": 26 }

數(shù)據(jù)格式如下圖：
一個(gè)對象，首先是key為count、start、subjects、total，前面的key對應(yīng)相應(yīng)的value，其中subjects的value是一個(gè)數(shù)組，包含若干個(gè)對象，對象中用key/value保存了很多關(guān)于影片的詳細(xì)信息。

針對上面的數(shù)據(jù)，我們測試下for in循環(huán)：

var amovie = moviesDouban;for (var idx in amovie){console.log(idx); } count start subjects totalfor (var idx in amovie.subjects){console.log(idx); } 0 1 2 3 4 5 6 7 8 9 10 11 12 13

總結(jié)：for in循環(huán)的只是key/value中的key，也就是下標(biāo)/索引

總結(jié)

以上是生活随笔為你收集整理的再说for in循环的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

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