Javascript: TypeError: ... 不是构造函数
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Javascript: TypeError: ... is not a constructor
提问by user2089120
I have a TypeError problem:
我有一个类型错误问题：
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;
}
}
gives the following error:
给出以下错误：
TypeError: album is not a constructor
TypeError: album is not a constructor
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?
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？
回答by Denys Séguret
This line
这条线
var album = new album(albumName);
shadows the external albumfunction. So yes, albumisn't a constructor inside the function. To be more precise it's undefinedat this point.
遮蔽外部album功能。所以是的，album不是函数内部的构造函数。更准确地说，是undefined在这一点上。
To avoid this kind of problem, I'd suggest naming your "classes" starting with an uppercase :
为避免此类问题，我建议您以大写字母开头命名您的“类”：
function Album(name) {
More generally I'd suggest to follow the Google style guidewhen in doubt.
更一般地说，我建议在有疑问时遵循Google 风格指南。
