Question

使用普通的Javascript，我正在尝试访问数组theatricalrelease中所有对象的属性movies。

＆＃13;

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);
      }
    }
  }
}

＆＃13;

正如你所看到的，我试图在另一个循环中使用另一个for循环，因为我希望它循环遍历对象的索引名称。相反，记录property给了我每个索引的名称。如何访问每部电影的戏剧版？

Answer 1

问题是您在代码底部有一个对象和一个额外}括号的数组。我对你的阵列进行了一些修改，以达到我的目的。现在，您可以在console.log打印剧场版。

＆＃13;

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'])
}

＆＃13;

Answer 2

根据您的方法： 只有一个元素：

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));

.as-console-wrapper { max-height: 100% !important; top: 0; }

获取数组中对象的对象属性

2 个答案: