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HTML5 Video Playback Speed Control Keyboard Shortcut

Add keyboard shortcuts to decrease (CTRL+,), increase (CTRL+.), and reset (CTRL+;) HTML5 video playback rate. Available playback speeds are between 0.25 to 2.0 inclusive in 0.25 increments. Speed of 1.0 is used when resetting playback speed. Note: the video playback speed menu selection on YouTube will not be affected.

当前为 2017-09-12 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        HTML5 Video Playback Speed Control Keyboard Shortcut
  3. // @namespace   HTML5VideoPlaybackSpeedControlKeyboardShortcut
  4. // @description Add keyboard shortcuts to decrease (CTRL+,), increase (CTRL+.), and reset (CTRL+;) HTML5 video playback rate. Available playback speeds are between 0.25 to 2.0 inclusive in 0.25 increments. Speed of 1.0 is used when resetting playback speed. Note: the video playback speed menu selection on YouTube will not be affected.
  5. // @version     1.0.2
  6. // @author      jcunews
  7. // @include     http://*/*
  8. // @include     https://*/*
  9. // @grant       none
  10. // ==/UserScript==
  11.  
  12. addEventListener("keydown", function(ev) {
  13.   var ele = document.querySelector("VIDEO"), rate;
  14.   if (ele && ev.ctrlKey) {
  15.     rate = rate = ele.playbackRate;
  16.     if ((ev.key === ",") || (ev.keyIdentifier === "U+00BC")) {
  17.       rate -= 0.25;
  18.       if (rate < 0.25) rate = 0.25;
  19.     } else if ((ev.key === ".") || (ev.keyIdentifier === "U+00BE")) {
  20.       rate += 0.25;
  21.       if (rate > 2) rate = 2;
  22.     } else if ((ev.key === ";") || (ev.keyIdentifier === "U+00BA")) {
  23.       rate = 1;
  24.     }
  25.     rate = Math.trunc(rate * 4) / 4;
  26.     ele.playbackRate = rate;
  27.   }
  28. });