methods: {
    setCameraPostion: (()=>{
        let _eye = new Vector3();
        let eyeDirection = new Vector3();
        let target = new Vector3();
        let distance, newDistance;
        return function setCameraPostion(args) {
            _eye.copy(args.pos).sub(target);
            eyeDirection.copy(_eye).normalize();
            distance = _eye.length();
            newDistance = ...(有點長，略過);
            eyeDirection.setLength(newDistance).add(target);
            return eyeDirection;
        }
    })(),
}

以上寫法是可以執(zhí)行的，我想問得是這種寫法是否可??？需不需要優(yōu)化？
個人感覺這種輔助變量寫在data里很別扭...強迫癥了快
但缺點是無法使用this——不知道怎么用
謝謝