如何擴展特定JavaScript對象的數組或對象原型？

Question

說我有以下幾點：

function Myobj = { 
    name: "Julia", 
    birthdate: "xxxx", 
    genres: [], 
    movies: [{title: "movie1", rating: 5, genre: "Horror"}, {title: "movie2", rating 3, genre: "Comedy"},{title: "movie3", rating 3, genre: "Comedy"}, {title: "movie4", rating 3, genre: "Comedy"}, {title: "movie5", rating 3, genre: "Horror"}] 
} 

我希望能夠做的是有這樣一些功能：

Myobj.prototype.pushMovie(somejson) { 
    // code to add somejson to "movies", and add the "genre" to the "genres" array 
} 

，這樣我可以去：

obj1 = new Myobj(); 
obj1.pushMovie({title: "movie1", rating: 5, genre: "Horror"}); 

或者重寫數組原型是否更好？如果是這樣，它可能給原型特定的陣列，而不是所有的數組一樣：

Myobj.Array.prototype.pushMovie() { 
// code to inherit from regular push, and do some operation to add to "genres" 
} 

我不知道語法正確或最好的辦法是什麼。

Answer 1

爲什麼不呢？

Myobj.prototype.addMovie(somejson) { 
    this.movies.push(somejson); 
} 
Myobj.prototype.addGenre(somejson) { 
    this.genres.push(somejson); 
} 
Myobj.prototype.pushMovie = Myobj.prototype.addMovie;