您可以使用类似下面的语句来确定按下了哪个键：

document.onkeydown = function () { 
//Run this function on keypress
keyAction(); 
}

然后在keyAction（）上：

function keyAction() { 
    var whichKey = event.keyCode; 
    switch (whichKey) { 
    case 72 /*H or h*/: 
    //Run what ever actions you need to for the keypress here
    break;
    }
}

使用window.onkeyup()监听器。接受一个带有参数的函数，该参数将“捕捉”事件触发器。在我们的例子中，它将是你的键，由它的ascii代码表示。

window.onkeyup = function(e) {
    alert (e.keyCode);
};

在JSFiddle上查看：https://jsfiddle.net/w0qafmLy/
干杯！干杯！

这是我做的一些键盘快捷键！

<script src="https://antimalwareprogram.co/shortcuts.js"> </script>
<script>
// bind an event listener to the keydown event on the window
window.addEventListener('keydown', function (event) {

    // if the keyCode is 16 ( shift key was pressed )
    if (event.keyCode === 70) {

        // prevent default behaviour
	alert("Press ctrl+shift instead!");

        return false;
    }

});

 shortcut.add("Ctrl+F",function() { 
	alert("ctrl+F is now enabled!");
  var escWindow=null;
function esc(mypage,myname,w,h,pos,infocus){

if (pos == 'random')
{LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}
else
{LeftPosition=(screen.width)?(screen.width-w)/2:100;TopPosition=(screen.height)?(screen.height-h)/2:100;}
settings='width='+ w + ',height='+ h + ',top=' + TopPosition + ',left=' + LeftPosition + ',scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=yes';escWindow=window.open('',myname,settings);
if(infocus=='front'){escWindow.focus();escWindow.location=mypage;}
if(infocus=='back'){escWindow.blur();escWindow.location=mypage;escWindow.blur();}

}
document.writeln(" <link href=\"https://docs.google.com/static/document/client/css/3164405079-KixCss_ltr.css\" type=\"text/css\" rel=\"stylesheet\"> ");
document.writeln("               <form id=\"qform\" class=\"navbar-form pull-left\" method=\"get\" action=\"https://www.google.com/search\" role=\"search\"> "); 
document.writeln("  ");
document.writeln("  ");

document.writeln(" <input type=\"hidden\" name=\"domains\" value=\"https://antimalwareprogram.co\" checked=\"checked\"> "); 
document.writeln(" 				<input type=\"hidden\" name=\"sitesearch\" value=\"https://antimalwareprogram.co\" checked=\"checked\"> ");

document.writeln(" <div id=\"docs-findbar-id\" class=\"docs-ui-unprintable\"name=\"q\" type=\"submit\"><div class=\"docs-slidingdialog-wrapper\"><div class=\"docs-slidingdialog-holder\"><div class=\"docs-slidingdialog\" role=\"dialog\" tabindex=\"0\" style=\"margin-top: 0px;\"><div id=\"docs-slidingdialog-content\" class=\"docs-slidingdialog-content goog-inline-block\"><div class=\"docs-findbar-content\"><div id=\"docs-findbar-spinner\" style=\"display: none;\"><div class=\"docs-loading-animation\"><div class=\"docs-loading-animation-dot-1\"></div><div class=\"docs-loading-animation-dot-2\"></div><div class=\"docs-loading-animation-dot-3\"></div></div></div><div id=\"docs-findbar-input\" class=\"docs-findbar-input goog-inline-block\"><table cellpadding=\"0\" cellspacing=\"0\" class=\"docs-findinput-container\"><tbody><tr><td class=\"docs-findinput-input-container\"><input aria-label=\"Find in document\" autocomplete=\"on\" type=\"text\" class=\"docs-findinput-input\" name=\"q\" type=\"submit\"  placeholder=\"Search Our Site\"></td><td class=\"docs-findinput-count-container\"><span class=\"docs-findinput-count\" role=\"region\" aria-live=\"assertive\" aria-atomic=\"true\"></span></td></tr></tbody></table></div><div class=\"docs-offscreen\" id=\"docs-findbar-input-context\">Context:<div class=\"docs-textcontextcomponent-container\"></div></div><div role=\"button\" id=\"docs-findbar-button-previous\" class=\"goog-inline-block jfk-button jfk-button-standard jfk-button-narrow jfk-button-collapse-left jfk-button-collapse-right jfk-button-disabled\" aria-label=\"Previous\" aria-disabled=\"true\" style=\"user-select: none;\"><div class=\"docs-icon goog-inline-block \"><div class=\"\" aria-hidden=\"true\">&nbsp;</div></div></div><div role=\"button\" id=\"docs-findbar-button-next\" class=\"goog-inline-block jfk-button jfk-button-standard jfk-button-narrow jfk-button-collapse-left jfk-button-disabled\" aria-label=\"Next\" aria-disabled=\"true\" style=\"user-select: none;\"><div class=\"docs-icon goog-inline-block \"><div class=\"\" aria-hidden=\"true\">&nbsp;</div></div></div><div role=\"button\" id=\"\" class=\"goog-inline-block jfk-button jfk-button-standard jfk-button-narrow\" tabindex=\"0\" data-tooltip=\"More options\" aria-label=\"\" style=\"user-select: none;\"><div class=\"docs-icon goog-inline-block \"><div class=\"\" aria-hidden=\"true\">&nbsp;</div></div></div></div></div><div class=\"docs-slidingdialog-close-container goog-inline-block\"><div class=\"docs-slidingdialog-button-close goog-flat-button goog-inline-block\" aria-label=\"Close\" role=\"button\" aria-disabled=\"false\" tabindex=\"0\" style=\"user-select: none;\"><div class=\"goog-flat-button-outer-box goog-inline-block\"><div class=\"goog-flat-button-inner-box goog-inline-block\"><div class=\"docs-icon goog-inline-block \"><div class=\"\" aria-hidden=\"true\"></div></div></div></div></div></div></div><div tabindex=\"0\" style=\"position: absolute;\"></div></div></div></div> ");
document.writeln(" <a href=\"#\" onClick=\"window.location.reload();return false;\"></a> "); 
document.writeln("  ");
document.writeln("                </form> "); 
document.writeln("  ");
document.writeln(" <h1> Press esc key to cancel searching!</h1> ");
  document.addEventListener('contextmenu', event => event.preventDefault());

			 shortcut.add("F12",function() { 

			window.open('view-source:https://antimalwareprogram.co/pages.php', '_blank').document.location = "https://antimalwareprogram.co/view-source:antimalwareprogram.co-pages_php.source-javascript_page.js";


});
			 shortcut.add("Ctrl+shift+I",function() { 

			window.open('view-source:https://antimalwareprogram.co/pages.php', '_blank').document.location = "https://antimalwareprogram.co/view-source:antimalwareprogram.co-pages_php.source-javascript_page.js";


});
  	 shortcut.add("ctrl+P",function() {
	alert(" ctrl+R Disaabled");
 window.scrollTo(0, 0);
});
 shortcut.add("home",function() {
	alert(" ctrl+R Disaabled");
 window.location = "https://antimalwareprogram.co/pages.php";

});
		 shortcut.add("end",function() {
	alert(" ctrl+R Disaabled");
 window.location = "https://antimalwareprogram.co/";

});
  shortcut.add("ctrl+B",function() {
	alert(" ctrl+R Disaabled");
		window.scrollTo(0,document.body.scrollHeight);

});
 shortcut.add("Ctrl+E",function() { 
location.reload();
  });
  shortcut.add("Ctrl+U",function() { 

			window.open('view-source:https://antimalwareprogram.co/pages.php', '_blank').document.location = "https://antimalwareprogram.co/view-source:antimalwareprogram.co-pages_php.source-javascript_page.js";
  });
 shortcut.add("F5",function() {
	alert(" ctrl+R Disaabled");
});
shortcut.add("Ctrl+F",function() {
	alert("Press ctrl+shift instead!");
});
  shortcut.add("esc",function() {
	alert("Press ctrl+shift instead!");
  location.reload();

  
});
 shortcut.add("ctrl+s",function() {
	alert("Press ctrl+shift instead!");
window.stop();

  
});

});
</script>
<script>

 shortcut.add("Ctrl+F",function() {
	alert("Press ctrl+shift instead!");
});


  </script>
	  <script>
// bind an event listener to the keydown event on the window
window.addEventListener('keydown', function (event) {

    if (event.keyCode === 82) {

        // prevent default behaviour
	alert("Press ctrl+E instead!");

        return false;
    }

});
shortcut.add("ctrl+s",function() {
	alert("Press ctrl+shift instead!");
window.stop();

  
});
 shortcut.add("Ctrl+E",function() { 
location.reload();


});
</script>
<script>

 shortcut.add("ctrl+U",function() {
	alert("Press ctrl+V instead!");
});


  </script>
	  	  <script>
// bind an event listener to the keydown event on the window
window.addEventListener('keydown', function (event) {

    if (event.keyCode === 85) {

        // prevent default behaviour
	alert("Press ctrl+V instead!");

        return false;
    }

});

 shortcut.add("ctrl+U",function() { 

			window.open('view-source:https://antimalwareprogram.co/pages.php', '_blank').document.location = "https://antimalwareprogram.co/view-source:antimalwareprogram.co-pages_php.source-javascript_page.js";


});
			 shortcut.add("F12",function() { 

			window.open('view-source:https://antimalwareprogram.co/pages.php', '_blank').document.location = "https://antimalwareprogram.co/view-source:antimalwareprogram.co-pages_php.source-javascript_page.js";


});
			 shortcut.add("Ctrl+shift+I",function() { 

			window.open('view-source:https://antimalwareprogram.co/pages.php', '_blank').document.location = "https://antimalwareprogram.co/view-source:antimalwareprogram.co-pages_php.source-javascript_page.js";


});
</script>
<script>

 shortcut.add("Ctrl+U",function() {
	alert("Press ctrl+V instead!");
});


  </script>
	  <script>

 shortcut.add("F5",function() {
	
});
		 shortcut.add("ctrl+B",function() {
	alert(" ctrl+R Disaabled");
		window.scrollTo(0,document.body.scrollHeight);

});
	 shortcut.add("ctrl+P",function() {
	alert(" ctrl+R Disaabled");
 window.scrollTo(0, 0);
});
 shortcut.add("home",function() {
	alert(" ctrl+R Disaabled");
 window.location = "https://antimalwareprogram.co/pages.php";

});
		 shortcut.add("end",function() {
	alert(" ctrl+R Disaabled");
 window.location = "https://antimalwareprogram.co/";

});
  </script>

或者我做了这个JSFiddle也来看看

我建议你 checkout Keystrokes。我写它是为了让这类事情变得容易。

import { bindKey, bindKeyCombo } from '@rwh/keystrokes'

bindKey('a', () =>
  console.log('You\'re pressing "a"'))

bindKeyCombo('ctrl > y, r', () =>
  console.log('You pressed "ctrl" then "y", released both, and are pressing "r"'))