clearInterval不清除间隔-Java 学习之路

-1

谢谢你的回复 . 我已经解决了我的问题 . 我确实看到了它的回调函数列表 . 经过一些工作，我设法间隔拍摄，但第一次拍摄是在1秒后 . 1 - 一个问题 - 如果我在imIniatly中调用setInterval中的函数然后设置interval - 快速射击 . 2 - 我通过使setTimeout在1秒后将bool值hasShooted设置为false来解决问题，如果该值为false，我可以拍摄 . 在我这样做的功能中，我将其设置为true . 3 - 我意识到我只需要设置超时的最后一个函数而不是setInterval . var PlayerManager =（function（parent）{'use strict';

var bulletPossLeft,
    bulletPossTop,
    FIRE_SPEED = 1000,
    hasShot = false;

PlayerManager.prototype = Object.create(parent.prototype);

function PlayerManager() {
     parent.call(this);

     this.moveLeft= false;
     this.moveRight= false;
     this.moveForward= false;
     this.moveBack= false;
     this.isShooting= false;
     this.bulletManager = new BulletManager();
}

PlayerManager.prototype.onGameLoop = function(obj) {
    if (this.isShooting) {
        bulletPossLeft = obj.positionLeft + Math.floor(obj.planeWidth /2);
        bulletPossTop = obj.positionTop - Math.ceil(obj.planeHeight /2);

        if(!hasShot){
            this.shoot();
            hasShot = true;
            setTimeout(function(){
                hasShot = false;
            }, FIRE_SPEED);
        }
    }

    if (this.moveLeft && (obj.positionLeft - obj.speed) > 0) {
        obj.positionLeft -= obj.speed;
    }
    if (this.moveRight && (obj.positionLeft + obj.speed) < Game.getContextValue('width')) {
        obj.positionLeft += obj.speed;
    }
    if (this.moveForward && (obj.positionTop - obj.speed) > 0) {
        obj.positionTop -= obj.speed;
    }
    if (this.moveBack && (obj.positionTop + obj.speed) < Game.getContextValue('height')) {
        obj.positionTop += obj.speed;
    }

    obj.move();
};

PlayerManager.prototype.shoot = function(){
    this.bulletManager.spawn(new Bullet(bulletPossLeft, bulletPossTop, 'orange'));
};

PlayerManager.prototype.keyboardListener  =  function(e) {

    var value = e.type == 'keydown';

    switch (e.keyCode) {
        case 37:
            this.moveLeft = value;
            break;
        case 38:
            this.moveForward = value;
            break;
        case 39:
            this.moveRight = value;
            break;
        case 40:
            this.moveBack = value;
            break;
        case 32:
            this.isShooting = value;
            break;
        default:
            break;
    }
};

return PlayerManager;

}）（经理）;

1 回答

每次执行 onGameLoop 并且 this.isShooting 等于 true 时，您将设置新的间隔 . 因此，当您使用 clearInterval 时，您只清除最后一个间隔，而不是所有间隔 .

我建议您在清除间隔后清除变量 shootInterval （例如： shootInterval = null; ），并在第一个条件（ if (this.isShooting) ）中检查 shootInterval 是否为空 .

您的代码应如下所示：

var bulletPossLeft,
    bulletPossTop,
    fireSpeed = 1000,
    shootInterval,
    self;

PlayerManager.prototype = Object.create(parent.prototype);

function PlayerManager() {
     parent.call(this);

     this.moveLeft= false;
     this.moveRight= false;
     this.moveForward= false;
     this.moveBack= false;
     this.isShooting= false;
     this.bulletManager = new BulletManager();

     self = this;
}

PlayerManager.prototype.onGameLoop = function(obj) {
    if (this.isShooting && shootInterval == null) {
        bulletPossLeft = obj.positionLeft + Math.floor(obj.planeWidth /2);
        bulletPossTop = obj.positionTop - Math.ceil(obj.planeHeight /2);
        shootInterval = setInterval(function(){
            self.shoot();

        } , fireSpeed);
    }

    if(!this.isShooting) {
        clearInterval(shootInterval);
        shootInterval = null;
    }

    if (this.moveLeft && (obj.positionLeft - obj.speed) > 0) {
        obj.positionLeft -= obj.speed;
        debugger;

    }
    if (this.moveRight && (obj.positionLeft + obj.speed) < Game.getContextValue('width')) {
        obj.positionLeft += obj.speed;
    }
    if (this.moveForward && (obj.positionTop - obj.speed) > 0) {
        obj.positionTop -= obj.speed;
    }
    if (this.moveBack && (obj.positionTop + obj.speed) < Game.getContextValue('height')) {
        obj.positionTop += obj.speed;
    }

    obj.move();
};

PlayerManager.prototype.shoot = function(){
    this.bulletManager.spawn(new Bullet(bulletPossLeft, bulletPossTop, 'orange'));
};

PlayerManager.prototype.keyboardListener  =  function(e) {

    var value = e.type == 'keydown';

    switch (e.keyCode) {
        case 37:
            this.moveLeft = value;
            break;
        case 38:
            this.moveForward = value;
            break;
        case 39:
            this.moveRight = value;
            break;
        case 40:
            this.moveBack = value;
            break;
        case 32:
            this.isShooting = true;
            break;
        default:
            break;
    }

    if(e.type == 'keyup'){
        this.isShooting = false;
    }
};

return PlayerManager;

})(Manager);

回复于 2024-05-12T18:35:53+08:00

clearInterval不清除间隔

1 回答

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