播放暂停的时候，httpworker 有没有办法停止，播放的时候重新请求url。 about h265player HOT 2 OPEN

if ($box.offsetWidth <= 0) {
  $box.style.width =  canvasWidth + 'px'
}
if ($box.offsetHeight <= 0) {
  $box.style.height = canvasHeight + 'px'
}

const widthProportion = $box.offsetWidth / canvasWidth
const heightProportion = $box.offsetHeight / canvasHeight

if (heightProportion > widthProportion) {
  proportion = widthProportion
} else {
  proportion = heightProportion
}
$canvas.style.top = $box.offsetTop + (($box.offsetHeight - canvasHeight * proportion) / 2)  + 'px'
****$canvas.style.left = 0+'px'//$box.offsetLeft + (($box.offsetWidth - canvasWidth * proportion) / 2)  + 'px'
//$canvas.style.transform = `scale(${proportion }, ${proportion }) //页面发生伸缩的时候定位会错位。 我的做法直接铺满screen_canve
$canvas.style.transform = `scale(${widthProportion}, ${heightProportion})`****
$canvas.style['transform-origin'] = `top left`;
$canvas.style.display = 'inline-block'