JavaScript实现屏幕唤醒：动态内容更新时激活休眠显示器

Hey Benny, great question! Let’s walk through practical ways to wake your monitor when dynamic content updates, covering the approaches you mentioned plus OS-specific methods that work reliably.

Core Approaches & OS-Specific Solutions #

Windows #

• Simulate a Harmless Keystroke
  You can use AutoHotkey to send a non-intrusive keystroke (like toggling Scroll Lock twice) to wake the display. This works because even minor input events trigger the monitor to wake up without disrupting your open apps.
  Example AutoHotkey script snippet:

  ; Toggle Scroll Lock twice to trigger wake without interfering with apps
  Send {ScrollLock}{ScrollLock}
  

  Pair this with a script that monitors your dynamic content (e.g., a log file, network feed, or app window) — when changes are detected, run this snippet.

• Wake Directly via System Calls (Better Than Notifications Alone)
  Windows notifications don’t natively wake displays, but you can combine a notification with a PowerShell command to force the monitor on. Here’s a one-liner to wake the display instantly:

  Add-Type @"
  using System;
  using System.Runtime.InteropServices;
  public class DisplayWake {
      [DllImport("user32.dll")]
      public static extern bool SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
      public const uint WM_SYSCOMMAND = 0x0112;
      public const uint SC_MONITORPOWER = 0xF170;
      public const int MONITOR_ON = -1;
  }
  "@
  [DisplayWake]::SendMessage([IntPtr]::Zero, [DisplayWake]::WM_SYSCOMMAND, [IntPtr][DisplayWake]::SC_MONITORPOWER, [IntPtr][DisplayWake]::MONITOR_ON)
  

  Run this command right after sending a notification to ensure the monitor wakes up to show it.

macOS #

• Simulate a Keystroke
  Use AppleScript to send a harmless key press (like left Shift) to trigger wake. Example:

  tell application "System Events" to key code 56 -- Presses left Shift
  

  Pair this with a content-monitoring tool like fswatch (install via Homebrew) to track file changes and trigger the script when updates happen.

• Wake Directly with Scripting
  macOS notifications won’t wake the display by default, but you can use AppleScript or terminal commands to force it awake:

  tell application "System Events" to wake up
  

  Or via terminal (forces wake for 1 second, which is enough to reactivate the monitor):

  caffeinate -u -t 1
  

Linux #

• Simulate a Keystroke
  Use the xdotool utility to send a non-disruptive key press (install it first with sudo apt install xdotool on Debian/Ubuntu):

  xdotool key Shift_L
  

• Wake Directly via DPMS Commands
  Linux uses DPMS for display power management — you can force the monitor on with a simple terminal command:

  xset dpms force on
  

  To trigger this when content changes, use tools like inotifywait to monitor files or network events, then run the above command automatically.

Key Notes #

• Content Detection First: The critical piece is setting up logic to detect when your dynamic content changes. This could involve monitoring a log file, a web API response, or an app’s window content — the method depends on exactly what your "dynamic content" is.
• Notifications Alone Aren’t Enough: On most operating systems, system notifications don’t wake a sleeping monitor by default. You’ll need to pair them with a wake command or keystroke simulation to get the result you want.

内容的提问来源于stack exchange，提问作者Benjamin P