獲取數組中對象的對象屬性

Question

使用普通的JavaScript，我試圖訪問屬性， theatricalrelease陣列中的所有對象， movies 。

 var movies = [{ "Black Panther" : { "title" : "Black Panther", "theatricalrelease" : "2/16/2018" }, "Infinity War" : { "title" : "Avengers: Infinity War", "theatricalrelease" : "5/4/2018" }, "Captain Marvel" : { "title" : "Captain Marvel", "theatricalrelease" : "TBA" } }]; for (var i = 0; i < movies.length; i++) { console.log(movies[i]); //TRIED for (var property in movies[i]) { if (movies[i].hasOwnProperty(property)) { console.log(property); } } } } 

如您所見，我試圖在另一個對象中使用另一個for循環，因為我希望它能遍歷對象的索引名稱。 相反，logging property為我提供了每個索引的名稱。 如何訪問每部電影的劇場版？

Answer 1

問題是您在代碼底部有一個包含一個對象的數組和一個額外的}括號。 我對您的陣列做了一些更改，以達到您的預期。 現在，這將在您的console.log顯示戲劇發行版。

 var movies = [{ "title" : "Black Panther", "theatricalrelease" : "2/16/2018" },{ "title" : "Avengers: Infinity War", "theatricalrelease" : "5/4/2018" },{ "title" : "Captain Marvel", "theatricalrelease" : "TBA" }]; for (var i = 0; i < movies.length; i++) { console.log(movies[i]); console.log('theatrical release', movies[i]['theatricalrelease']) } 

Answer 2

根據您的方法： 僅一個元素 ：

 var movies = [{ "title": "Black Panther", "theatricalrelease": "2/16/2018"}, { "title": "Avengers: Infinity War", "theatricalrelease": "5/4/2018"}, { "title": "Captain Marvel", "theatricalrelease": "TBA"}]; movies.forEach(({theatricalrelease}) => console.log(theatricalrelease)); 

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