Jump animation dont stop

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1 
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var AnimationBlending = pc.createScript('animationBlending');

AnimationBlending.states = {
    idle: {
        animation: 'Idle.json'
    },
    Jump: {
        animation: 'Jump.json'
    },
     Left: {
        animation: 'Left.json'
    },
     Right: {
        animation: 'Right.json'
    },
    Back: {
        animation: 'Back.json'
    },
    Walk: {
        animation: 'Walk.json'
    }
};

// initialize code called once per entity
AnimationBlending.prototype.initialize = function() {
    this.blendTime = 0.2;

    this.setState('idle');

    this.app.keyboard.on(pc.EVENT_KEYDOWN, this.keyDown, this);
    this.app.keyboard.on(pc.EVENT_KEYUP, this.keyUp, this);
};

AnimationBlending.prototype.setState = function (state) {
    var states = AnimationBlending.states;

    this.state = state;
    // Set the current animation, taking 0.2 seconds to blend from
    // the current animation state to the start of the target animation.
    this.entity.animation.play(states[state].animation, this.blendTime);
};

AnimationBlending.prototype.keyDown = function (e) {
    if ((e.key === pc.KEY_W) && (this.state !== 'Walk')) {
        this.setState('Walk');
    }
     // e.g. jumping works with space key
    if ((e.key === pc.KEY_SPACE) && (this.state !== 'Jump')) {
        this.setState('Jump');
    }
    
     if ((e.key === pc.KEY_S) && (this.state !== 'Back')) {
        this.setState('Back');
    }
    
    if ((e.key === pc.KEY_D) && (this.state !== 'Right')) {
        this.setState('Right');
    }
    
    if ((e.key === pc.KEY_A) && (this.state !== 'Left')) {
        this.setState('Left');
    }
    
};

AnimationBlending.prototype.keyUp = function (e) {
    if ((e.key === pc.KEY_W) && (this.state === 'Walk')) {
        this.setState('idle');
    }
    
    if ((e.key === pc.KEY_S) && (this.state === 'Back')) {
        this.setState('idle');
    }
    
    if ((e.key === pc.KEY_SACE) && (this.state === 'Jump')) {
        this.setState('idle');
    }
    
    if ((e.key === pc.KEY_D) && (this.state === 'Right')) {
        this.setState('idle');
    }
    
    if ((e.key === pc.KEY_A) && (this.state === 'Left')) {
        this.setState('idle');
    }
   
};
2

Try to set the animation loop on false.

if (this.state === 'Jump') {
    this.entity.animation.loop = false;
}
else {
    this.entity.animation.loop = true;
}
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