重播 2 次後,靜止
if( !this.alreadyExecuted ){
    this.alreadyExecuted = true;
    this.loopTime = 1;
} else {
    this.loopTime++;
    
    if( this.loopTime == 2 ){
        
        this.stop();
    }
}
if( !this.alreadyExecuted ){
    this.alreadyExecuted = true;
    this.loopTime = 1;
} else {
    this.loopTime++;
    
    if( this.loopTime == 2 ){
        
        this.stop();
    }
}