js实现键盘按键检测

 1 DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 2 <HTML>
 3 <HEAD>
 4     <TITLE>js 按键记录TITLE>
 5 HEAD>
 6 <BODY>
 7     <script type="text/javascript">
 8         var keystring = "";//记录按键的字符串
 9         function $(s) { return document.getElementById(s) ? document.getElementById(s) : s; }
10         function keypress(e) {
11             var currKey = 0, CapsLock = 0, e = e || event;
12             currKey = e.keyCode || e.which || e.charCode;
13             CapsLock = currKey >= 65 && currKey <= 90;
14             switch (currKey) {
15                 //屏蔽了退格、制表、回车、空格、方向键、删除键
16                 case 8: case 9: case 13: case 32: case 37: case 38: case 39: case 40: case 46: keyName = ""; break;
17                 default: keyName = String.fromCharCode(currKey); break;
18             }
19             keystring += keyName;
20         }
21         function keydown(e) {
22             var e = e || event;
23             var currKey = e.keyCode || e.which || e.charCode;
24             if ((currKey > 7 && currKey < 14) || (currKey > 31 && currKey < 47)) {
25                 switch (currKey) {
26                     case 8: keyName = "[退格]"; break;
27                     case 9: keyName = "[制表]"; break;
28                     case 13: keyName = "[回车]"; break;
29                     case 32: keyName = "[空格]"; break;
30                     case 33: keyName = "[PageUp]"; break;
31                     case 34: keyName = "[PageDown]"; break;
32                     case 35: keyName = "[End]"; break;
33                     case 36: keyName = "[Home]"; break;
34                     case 37: keyName = "[方向键左]"; break;
35                     case 38: keyName = "[方向键上]"; break;
36                     case 39: keyName = "[方向键右]"; break;
37                     case 40: keyName = "[方向键下]"; break;
38                     case 46: keyName = "[删除]"; break;
39                     default: keyName = ""; break;
40                 }
41                 keystring += keyName;
42             }
43             $("content").innerHTML = keystring;
44         }
45         function keyup(e) {
46             $("content").innerHTML = keystring;
47         }
48         document.onkeypress = keypress;
49         document.onkeydown = keydown;
50         document.onkeyup = keyup;
51     script>
52     <input type="text" />
53     <input type="button" value="清空记录" onclick="$('content').innerHTML = '';keystring = '';" />
54     <br />请按下任意键查看键盘响应键值:<span id="content">span>
55 BODY>
56 HTML> 

 

转载于:https://www.cnblogs.com/tl2f/p/5604813.html

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