javascript从数组中读取对象

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

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 2

这是因为您没有Player正确创建一个。而不是使用let player1 = Player，使用let player1 = new Player()。此外，您需要创建一个Players数组。最后，你需要Player上课。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 functionfunction 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 3

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].coordsvar xcoord = allcoords[1]var ycoord = allcoords[2]var mapnum = allcoords[0]console.log("map: " + mapnum + " x: " + xcoord + " y: " + ycoord);}这很好用！