[英]How to access methods inside another classes through instance of another class in Javascript
[英]Is it possible to access to a class instance that it is inside another class in JavaScript?
我試圖訪問在類中實例化的對象,但有些東西不起作用。
我有三個類:應用程序、地圖、播放器
應用類實例化地圖類
class App { constructor(canvas, sizeX, sizeY, sizeCase) { this.map = new Map(canvas, sizeX, sizeY, sizeCase); } }
地圖
在Map
類中,實例化了Player
類。 我的主要問題是我無法訪問Player
的實例來訪問它的方法
class Map { constructor(canvas, sizeX, sizeY, sizeCase) { this.canvas = document.getElementById("canvas"); this.canvas.width = sizeX * sizeCase; this.canvas.height = sizeY * sizeCase; this.size = { x: sizeX, y: sizeY, case: sizeCase }; } setPlayers(quantity) { for (let index = 0; index < quantity; index++) { let x = App.random(this.size.x); let y = App.random(this.size.y); if (this.mapGame[x][y] == 0) { switch (index) { case 0: let player1 = new Player("vampi", 100, y, x); break; case 1: let player2 = new Player("wolfi", 100, y, x); break; default: break; } }else { console.log("Position occupied"); index--; } } } }
播放器
class Player { constructor(name, score, positionY, positionX) { this.name = name; this.score = score; } drawPlayer(playerImage) { app.map.mapGame[this.y][this.x] = 2; } }
我在這里讀到的大多數問題都與 java 相關,而我發現的 javascript 問題與我的問題無關,或者我在閱讀它們后沒有找到關系。
控制台說:
“類型錯誤:app.map.player1 未定義”
變量與類屬性不同。 要使app.map.player1
工作,您需要分配該屬性。
setPlayers(quantity) {
for (let index = 0; index < quantity; index++) {
let x = App.random(this.size.x);
let y = App.random(this.size.y);
if (this.mapGame[x][y] == 0) {
switch (index) {
case 0:
this.player1 = new Player("vampi", 100, y, x);
break;
case 1:
this.player2 = new Player("wolfi", 100, y, x);
break;
default:
break;
}
} else {
console.log("Position occupied");
index--;
}
}
}
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