[英]Unable to access constructor's value from a prototype in javascript?
Question: Why is this.decks.push(data);
问题:为什么this.decks.push(data);
coming up undefined? 即将出现未定义? How can I get deckCtrl.decks
to properly log out? 如何获取deckCtrl.decks
正确注销?
Error: Uncaught TypeError: Cannot read property 'push' of undefined
错误: Uncaught TypeError: Cannot read property 'push' of undefined
var DECK_DATA = {};
DECK_DATA.cards = [
{
faces: [
{
name: 'a',
src: '',
link: ''
},
{
name: 'b',
src: '',
link: ''
},
{
name: 'b',
src: '',
link: ''
}
]
},
{
faces: [
{
name: 'a',
src: '',
link: ''
},
{
name: 'b',
src: '',
link: ''
},
{
name: 'b',
src: '',
link: ''
}
]
}
];
//Classes
var Deck = (function () {
function Deck(card) {
this.cards = card;
}
return Deck;
})();
var DeckController = (function () {
function DeckController() {
this.decks = [];
}
DeckController.prototype.addDeck = function (data) {
console.log(data, this.decks); //this.decks comes up undefined.
this.decks.push(data);
};
return DeckController;
})();
//main
var deckBuilder = Deck;
var deckCtrl = DeckController;
DECK_DATA.cards.forEach(function (item) {
deckCtrl.prototype.addDeck(new deckBuilder(item));
});
console.log(deckCtrl.decks);
You need to use new
to create a new instance: 您需要使用new
来创建新实例:
var deckBuilder = new Deck();
var deckCtrl = new DeckController();
And you want to use the addDeck of the instance, not of the prototype: 您想使用实例的addDeck而不是原型的addDeck:
DECK_DATA.cards.forEach(function (item) {
deckCtrl.addDeck(new deckBuilder(item));
});
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.