javascript 读取 object 出一个数组

Question

我如何读取列表中的玩家姓名？

let Players = []

let Player = {
    sprite: 1,
    coords: {M: 0, X: 0, Y: 0},
    name: ""
}

function LoadPlayers(){

console.log("total players: " + Players.length)

let player1 = Player
player1.sprite = 0
player1.coords = {M: 0, X: 6, Y: 1};
player1.name = "jimpie"

Players.push([player1]);



let player2 = Player         
player2.sprite = 0
player2.coords =  {M: 0, X: 1, Y: 17};
player2.name = "kolien"

Players.push([player2]);

console.log("total players: " + Players.length)

console.log("Player 1 name: " + Players[1].name)
console.log("Player 2 name: " + Players[0].name)
}

我现在得到“未定义”，我想从列表中的特定玩家读出玩家详细信息。

Answer 1

这是因为您没有正确创建Player 。 不要使用let player1 = Player ，而是使用let player1 = new Player() 。 此外，您需要创建一个Players数组。 最后，您需要制作一个Player class。

 class Player { constructor(sprite, coords, name) { this.sprite = sprite; this.coords = coords; this.name = name; } } var Players = []; // If you want to access this array // from outside thefunction, keep it here. // Otherwise, move it in the LoadPlayers function function LoadPlayers() { let player1 = new Player(0, { M: 0, X: 6, Y: 1 }, "jimpie"); Players.push(player1); let player2 = new Player(0, { M: 0, X: 1, Y: 17 }, "kolien") Players.push(player2); console.log("total players: " + Players.length) console.log("Player 1 name: " + Players[0].name) console.log("Player 2 name: " + Players[1].name) } LoadPlayers();

Answer 2

你有不同的错误。

首先，您必须使用new Player()而不仅仅是player 。

其次，你应该使用这个：

Players.push(player1);

而不是这个：

Players.push([player1]);

第一个将 player1 推送到 Players 数组，第二个将仅包含 player1 的新数组推送到数组 Players。 您还必须使用它来添加 player2。

Answer 3

谢谢@AlexH

function Player(sprite, coords, name){
    this.sprite = sprite;
    this.coords = coords;
    this.name = name;
}

let Players = []

function LoadPlayers(){

console.log("total players: " + Players.length)

let player1 = new Player(1, [32, 15, 14], "jimpie")

Players.push(player1);



let player2 = new Player(1, (1, 1, 1), "kolien")

Players.push(player2);

console.log("total players: " + Players.length)

console.log("Player 1 name: " + Players[0].coords)
console.log("Player 2 name: " + Players[1].name)

var allcoords = Players[0].coords
var xcoord = allcoords[1]
var ycoord = allcoords[2]
var mapnum = allcoords[0]

console.log("map: " + mapnum + " x: " + xcoord + " y: " + ycoord);

}

这很好用！