Javascript: TypeError: ... 不是构造函数 [英] Javascript: TypeError: ... is not a constructor

问题描述

我有一个类型错误问题:

I have a TypeError problem:

function artist(name) {
    this.name = name;
    this.albums = new Array();

    this.addAlbum = function(albumName) {
        for (var i = 0; i < this.albums.length; i++) {
            if (this.albums[i].name == albumName) {
                return this.albums[i];
            }
        }

        var album = new album(albumName);
        this.albums.push(album);

        return album;
    }
}

function album(name) {
    this.name = name;
    this.songs = new Array();
    this.picture = null;

    this.addSong = function(songName, track) {
        var newSong = new songName(songName, track);
        this.songs.push(newSong);

        return newSong;
    }
}

给出以下错误:

TypeError:专辑不是构造函数

我找不到问题.我阅读了很多其他帖子，但找不到类似的问题.难道是不允许在另一个对象中创建一个对象?我该如何解决这个问题?

I can't find the problem. I read a lot of other posts, but I could not find a similar problem. Could it be that it's not allowed to create an object in another object? How I can solve this problem?

推荐答案

此行

var album = new album(albumName);

隐藏外部album 功能.所以是的，album 不是函数内部的构造函数.更准确地说，此时它是 undefined.

shadows the external album function. So yes, album isn't a constructor inside the function. To be more precise it's undefined at this point.

为了避免这种问题，我建议您以大写开头命名您的类":

To avoid this kind of problem, I'd suggest naming your "classes" starting with an uppercase :

function Album(name) {

更一般地说，我建议在使用时遵循 Google 风格指南怀疑.

More generally I'd suggest to follow the Google style guide when in doubt.

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