向现有的javascript对象添加新属性

Question

I am trying to add format: "film" to each object in the array but I can't figure it out.

var movie = [
    {title: "A Clockwork Orange", year: "1971", raiting: "8.3", genre: "Crime, Drama, Sci-Fi"},
    {title: "Full Metal Jacket", year: "1987", raiting: "8.3", genre: " Drama, War"},
    {title: "Pulp Fiction", year: "1994", raiting: "8.9", genre: "Crime, Drama"},
    {title: "Fight Club", year: "1999", raiting: "8.8", genre: "Drama"},
    {title: "Interstellar", year: "2014", raiting: "8.6", genre: "Adventure, Drama, Sci-Fi"}
];


movie.forEach(function () {
    movie.format = "film";
});


movie.forEach(function (element) {
    console.log(element);
});

Answer 1

You need to pass an argument to function and add the new property to it

movie.forEach(function (element) {
    element.format = "film";
});

Answer 2

Using goes to operator.

 var movie = [ {title: "A Clockwork Orange", year: "1971", raiting: "8.3", genre: "Crime, Drama, Sci-Fi"}, {title: "Full Metal Jacket", year: "1987", raiting: "8.3", genre: " Drama, War"}, {title: "Pulp Fiction", year: "1994", raiting: "8.9", genre: "Crime, Drama"}, {title: "Fight Club", year: "1999", raiting: "8.8", genre: "Drama"}, {title: "Interstellar", year: "2014", raiting: "8.6", genre: "Adventure, Drama, Sci-Fi"}]; let i = movie.length; while (i --> 0) movie[i].format = 'film'; console.log(movie); 

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

Answer 3

如果您也喜欢ES6，则可以使用粗箭头进行确认。

movie.forEach(element => element.format = "film");