移相器:this.game在Update函数中未定义 [英] Phaser: this.game is undefined in the Update function

问题描述

晚上好， 很抱歉再次提出要求，但我需要在明天上学之前完成.基本上，当我尝试在更新函数中访问this.game变量时，它说它是未定义的，具体来说，我得到了这个. 未捕获的TypeError:无法读取未定义的属性'状态'". 在我的更新功能中，我有这个:

Good evening, sorry for asking again, but I need to be done with this by tomorrow for school. Basically, when I try to access the this.game variable in the update function, it says that it is undefined, to be specific, I get this; "Uncaught TypeError: Cannot read property 'state' of undefined". In my update function I have this:

create: function() {
    [...]
    map.setCollisionByExclusion([], true, doorLayer);
    [...]
}

当我尝试在碰撞操作的更新功能中访问this.game时，出现上述错误. 这是代码；

When I try to access this.game in the update function on the collision action, I get the error mentioned above. Here's the code;

update: function() {
    [...]
    this.game.physics.arcade.collide(player, doorLayer, function() {
        if (hasItem) {
            this.game.state.start('Hallway'); //This is where I get the error
        }
    });
    [...]
}

谢谢您的时间.

推荐答案

this.game.physics.arcade.collide(player, doorLayer, function() { if (hasItem) { this.game.state.start('Hallway'); //This is where I get the error } });

this.game.physics.arcade.collide(player, doorLayer, function() { if (hasItem) { this.game.state.start('Hallway'); //This is where I get the error } });

请注意，内部this指的是您传递的匿名函数，该函数显然没有名为game的成员.

Notice the inner this refers to the anonymous function you are passing which clearly does not have a member named game.

理想情况下，将this重命名为其他名称，然后再使用它. 现在，您可以在传递的匿名函数中使用myself变量，并访问myself的属性.

Ideally, rename this to something else and then use it. Now you can use myself variable inside the anonymous function passed and access myself's properties.

即

var myself = this;

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