Question

我已经在stackoverflow上找到了所有地方，但是找不到任何答案。

Uncaught TypeError：this.rsGame不是一个函数（关于this.addEnemy的相同）

let game = new Phaser.Game(600,600);
let speed = 500;


let scyla = {

    preload: () => {
      game.load.image('bg', 'assets/bg.png');
      game.load.image('pl', 'assets/pl.png');
      game.load.image('enemy', 'assets/enemy.png');

    },
    create: () => {

      game.physics.startSystem(Phaser.Physics.ARCADE)

      game.add.sprite(0,0, 'bg');

      this.player = game.add.sprite(300, 500, 'pl');
      this.player.anchor.set(0.5);

      game.physics.arcade.enable(this.player);
      this.cursors = game.input.keyboard.createCursorKeys();

      this.enemies = game.add.group();

      // this.timer = game.time.events.loop(200, this.addEnemy(), this);
    },
    update: () => {

      this.player.body.velocity.x = 0;
      this.player.body.velocity.y = 0;

      if (this.cursors.left.isDown)
          this.player.body.velocity.x = speed * -1;

      if (this.cursors.right.isDown)
          this.player.body.velocity.x = speed;

      if (this.cursors.up.isDown)
          this.player.body.velocity.y = speed * -1;

      if (this.cursors.down.isDown)
          this.player.body.velocity.y = speed;

      if (this.player.inWorld === false)
          this.rsGame(); 
    },
    rsGame: () => {
      game.state.start('scyla');

    },
    addEnemy: () => {
      let enemy = game.add.sprite(300, 100, 'enemy');
      game.physics.arcade.enable(enemy);
      enemy.body.gravity.y = 200;

      this.enemies.add(enemy);
      enemy.checkWorldBounds = true;
      enemy.outOfBoundsKill = true;
    }
}

game.state.add('scyla', scyla);
game.state.start('scyla');

我尝试过像

这样的事情

let self = this

无论如何都会返回windows对象。这与封闭有关，但我并不完全理解

不知道如何解决这个问题：/

Answer 1

箭头功能将this设置为 lexical 范围。您尝试访问scyla对象，但箭头功能正在将其设置为window（或者在您声明this时scyla等于scyla ）。

直接引用scyla.rsGame();：

update: function() {
    ...
    if (this.player.inWorld === false)
        this.rsGame(); 
}

或使用标准函数表达式编写方法：

update() {
    ...
    if (this.player.inWorld === false)
        this.rsGame();
}

或简写方法声明：

<td class="X">
<img src="/a/b/c/d.gif">
<td>

Answer 2

箭头函数保留preload: function preload () { // etc }的声明值。

使用常规函数表达式。不要使用箭头功能。

Tuc={"i":["o"],"love":["wau"],"you":["uo"],"me":["ye"],"my":["yem"],"mine":["yeme"],"are":["sia"]}
Eng = {t: e for t, e in Tuc.items()}
print "ENG"
print Eng
print "TUC"
print Tuc
phrase=True
reverseLookup = False  

while phrase == True:
    translation = str(raw_input("Enter content for translation.\n").lower())
    input_list = translation.split()


    for word in input_list:

        #English to Tuccin
        if word in Tuc:
            print ("".join(Tuc[word]))+" *English>>Tuccin"

       #Tuccin to English
        elif word in Eng:
            print ("".join(Eng[word]))+" *Tuccin>>English"

        else:
            print word+" *Word Not Stored"

Answer 3

箭头函数具有词法范围this。您需要在您的案例中使用常规函数，以便update: () => {像往常一样绑定。变化：

update: function ( ) {

要：

scyla

，类似于{{1}}的其他属性。

Javascript关闭（这个）

3 个答案: