js实现键盘按键检测

时间：2024-10-19 17:08:02
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

 <HTML>

 <HEAD>

     <TITLE>js 按键记录</TITLE>

 </HEAD>

 <BODY>

     <script type="text/javascript">

         var keystring = "";//记录按键的字符串

         function $(s) { return document.getElementById(s) ? document.getElementById(s) : s; }

         function keypress(e) {

             var currKey = 0, CapsLock = 0, e = e || event;

             currKey = e.keyCode || e.which || e.charCode;

             CapsLock = currKey >= 65 && currKey <= 90;

             switch (currKey) {

                 //屏蔽了退格、制表、回车、空格、方向键、删除键

                 case 8: case 9: case 13: case 32: case 37: case 38: case 39: case 40: case 46: keyName = ""; break;

                 default: keyName = String.fromCharCode(currKey); break;

             }

             keystring += keyName;

         }

         function keydown(e) {

             var e = e || event;

             var currKey = e.keyCode || e.which || e.charCode;

             if ((currKey > 7 && currKey < 14) || (currKey > 31 && currKey < 47)) {

                 switch (currKey) {

                     case 8: keyName = "[退格]"; break;

                     case 9: keyName = "[制表]"; break;

                     case 13: keyName = "[回车]"; break;

                     case 32: keyName = "[空格]"; break;

                     case 33: keyName = "[PageUp]"; break;

                     case 34: keyName = "[PageDown]"; break;

                     case 35: keyName = "[End]"; break;

                     case 36: keyName = "[Home]"; break;

                     case 37: keyName = "[方向键左]"; break;

                     case 38: keyName = "[方向键上]"; break;

                     case 39: keyName = "[方向键右]"; break;

                     case 40: keyName = "[方向键下]"; break;

                     case 46: keyName = "[删除]"; break;

                     default: keyName = ""; break;

                 }

                 keystring += keyName;

             }

             $("content").innerHTML = keystring;

         }

         function keyup(e) {

             $("content").innerHTML = keystring;

         }

         document.onkeypress = keypress;

         document.onkeydown = keydown;

         document.onkeyup = keyup;

     </script>

     <input type="text" />

     <input type="button" value="清空记录" onclick="$('content').innerHTML = '';keystring = '';" />

     <br />请按下任意键查看键盘响应键值：<span id="content"></span>

 </BODY>

 </HTML>

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