子类不写构造函数，子类能继承父类的属性吗？this._transform属性是不是继承来的？

// 继承

class MultiTransform extends Transform {

multi(value, time) {

return this._add('multi', value, time);

}

sleep(value) {

return this._add('speep', '', value);

}

_getTransform({ time, value, type }) {

const _tsf = this._transform;

switch (type) {

case 'translate':

_tsf.translate = `translate(${ value })`;

break;

case 'scale':

_tsf.scale = `scale(${ value })`;

break;

case 'rotate':

_tsf.rotate = `rotate(${value}deg)`;

break;

case 'multi':

value.forEach(item => {

this._getTransform(item);

});

case 'sleep':

break;

}

return `${_tsf.translate} ${_tsf.scale} ${_tsf.rotate}`;

}

}