Raycaster questions of threejs in vuejs

Questions
1

I use raycaster of threejs in vue.My question is ,

when raycaster get intersectObjects ,and I can move the selected object position using custom div tag arrow.

But I moved the selected object two ~ three times, the object can not be selected using raycaster of threejs again.

if I refrash the web, I can select it again.

this is my code problem,or threejs sdk question?

Thank you.

this is my code:

    onPointerDown_move( event ) {
    var self =this;
    self.onDownPosition.x = event.clientX;
    self.onDownPosition.y = event.clientY;

    self.pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
     self.pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;


    // console.log(self.onDownPosition.x+";"+self.onDownPosition.y);
    // console.log(self.pointer.x+";"+self.pointer.y);
    var raycaster = new THREE.Raycaster(); // create once

    raycaster.setFromCamera(self.pointer, self.camera);
   // this.raycaster.linePrecision =0.1;

    // console.log(this.raycaster);
    // console.log(this.pointer);
    // console.log(this.camera);

    const intersects = raycaster.intersectObjects( this.splineHelperObjects );
    console.log(intersects);
    if ( intersects.length > 0 ) {

        const object = intersects[0].object;

        console.log(object);

        self.splineHelperObjects.forEach(element => {
            // console.log(element);
            if(element == object)
            {
                element.material = self.material_select;
                self.spline_Object_select.main = element;
                self.spline_Object_select.pos_screen = self.getScreenPos(self.spline_Object_select.main);
                //console.log(self.spline_Object_select.pos_screen);
            }
            else
            {
                element.material = self.material;
            }
        });
    }
    else
    {
        if(this.mouseEnter_x == false && this.mouseEnter_y == false)
        {
            //如果沒有點選東西 把點選的東西取消掉
            if(this.spline_Object_select.main !=null)
            {
                this.spline_Object_select.main.material = self.material;
                this.spline_Object_select.main =null;
                this.spline_Object_select.pos_screen =null;
            }
        }

    }
}