如何为Google Street View实施“前进”操作？

function difference(link) {
  return Math.abs(pano.pov.heading%360 - link.heading);
}

function moveForward() {
  var curr;
  for(i=0; i < pano.links.length; i++) {
    var differ = difference(pano.links[i]);
    if(curr == undefined) {
      curr = pano.links[i];
    }

    if(difference(curr) > difference(pano.links[i])) {
      curr = curr = pano.links[i];
    }
  }
  pano.setPano(curr.pano);
}

function difference(link) {

    var diff = Math.abs(panorama.pov.heading % 360 - link.heading);
    if(diff>180)
       diff=Math.abs(360-diff);

    return diff;

}