Google Chrome浏览器不提示用户在我的网站上启用Flash

Question

Google Chrome浏览器不再提示我的网站上的用户启用Flash，这是播放用户上传的视频所必需的。 这是最近的更改，我认为这是由于Chrome在2017年缓慢禁用了Flash（我没有做任何更改）。 它在Firefox上运行良好。

最好的解决方案是将视频转换为mp4而不是flv，但是现在我需要针对那些积极使用该网站的用户解决此问题。 我需要一种强制浏览器提示用户启用Flash的方法。 我知道这是有可能的，就像我在其他站点上看到的那样，但我不确定ATM的运行方式。 有任何想法吗？

这是播放视频的代码：

<script type='text/javascript' src='/jwplayer/swfobject.js'>/script>
<div id='mediaspaceX'>This text will be replaced</div>

<script type='text/javascript'>
  var so = new SWFObject('/jwplayer/player.swf','mpl',640,480,'9');
  so.addParam('allowfullscreen','true');
  so.addParam('allowscriptaccess','always');
  so.addParam('wmode','opaque');
  so.addVariable('file',escape('the_video.flv'));
  so.addVariable('backcolor','111111');
  so.addVariable('frontcolor','7fc9eb');
  so.addVariable('lightcolor','cd6a28');
  so.addVariable('screencolor','000000');

  so.addVariable('playlistsize','0');
  so.addVariable('skin','/jwplayer/stylish.swf');
  so.write('mediaspaceX');
</script>

Answer 1

一个简单的

<a href="https://get.adobe.com/flashplayer">Enable Flash</a>

会做的工作。

Answer 2

您可以使用以下技巧强制浏览器显示权限提示：

/**
 * Tries to show browser's promt for enabling flash
 *
 * Chrome starting from 56 version and Edge from 15 are disabling flash
 * by default. To promt user to enable flash, they suggest to send user to
 * flash player download page. Then this browser will catch such request
 * and show a promt to user:
 * https://www.chromium.org/flash-roadmap#TOC-Developer-Recommendations
 * In this method we are forcing such promt by navigating user to adobe
 * site in iframe, instead of top window
 */
function requestFlashPermission() {
    var iframe = document.createElement('iframe');
    iframe.src = 'https://get.adobe.com/flashplayer';
    iframe.sandbox = '';
    document.body.appendChild(iframe);
    document.body.removeChild(iframe);
}


var isNewEdge = (navigator.userAgent.match(/Edge\/(\d+)/) || [])[1] > 14;
var isNewSafari = (navigator.userAgent.match(/OS X (\d+)/) || [])[1] > 9;
var isNewChrome = (navigator.userAgent.match(/Chrom(e|ium)\/(\d+)/) || [])[2] > 56
    && !/Mobile/i.test(navigator.userAgent);
var canRequestPermission = isNewEdge || isNewSafari || isNewChrome;

if (!swfobject.hasFlashPlayerVersion('10') && canRequestPermission) {
    // in case, when flash is not available, try to prompt user to enable it
    requestFlashPermission();
    // Chrome requires user's click in order to allow iframe embeding
    $(window).one('click', requestFlashPermission);
}

基于： https : //www.chromium.org/flash-roadmap#TOC-Developer-Recommendations