问未定义的TypeError:无法读取未定义的属性(读取“照相机”)

EN

  bindIFrameMousemove(iframe){
  iframe.contentWindow.addEventListener('mousemove', function(event) {
  const mouse = new Vector2();
  var clRect = iframe.getBoundingClientRect();
  var evt = new CustomEvent('mousemove', {bubbles: true, cancelable: false});
  const clientX = (window.TouchEvent && event instanceof TouchEvent) ? 
  event.changedTouches[0].clientX : event.clientX;
  const clientY = (window.TouchEvent && event instanceof TouchEvent) ? 
  event.changedTouches[0].clientY : event.clientY;
  const x = ( clientX / window.innerWidth ) * 2 - 1;
  const y = - ( clientY / window.innerHeight ) * 2 + 1;
  iframe.dispatchEvent(evt);
   event.preventDefault();
   mouse.x= ( clientX / window.innerWidth ) * 2 - 1;
   mouse.y =  - ( clientY / window.innerHeight ) * 2 + 1;
   Raycaster.setFromCamera( mouse, this.context.camera );
   const intersects = Raycaster.getIntersectObjects(this.scene.children ,true );
   console.log(intersects)
   if (intersects.length > 0) {
     console.log("intersects !!");

   }
});};