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javascript 响应键盘特定按键(只响应数字键)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
<title>响应键盘特定按键(只响应数字键)</title> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20type%3D%22text%2Fjavascript%22%3E%3C!--%20%0D%0A%2F%2F%E9%99%90%E5%88%B6%E5%8F%AA%E8%83%BD%E8%BE%93%E5%85%A5%E6%95%B0%E5%AD%97%20%0D%0Afunction%20checkNum()%20%0D%0A%7B%20%2F%2Falert(event.keyCode)%3B%20%0D%0Aif((event.keyCode%3E%3D48%26%26event.keyCode%3C%3D57)%7C%7Cevent.keyCode%3D%3D8%7C%7C(event.keyCode%3E%3D96%26%26event.keyCode%3C%3D105)%20%0D%0A%7C%7Cevent.keyCode%3D%3D46%7C%7Cevent.keyCode%3D%3D37%7C%7Cevent.keyCode%3D%3D39%7C%7Cevent.keyCode%3D%3D190)%20%0D%0A%2F%2F%7C%7Cevent.keyCode%3D%3D110)%2F%2F%E5%8A%A0%E4%B8%8A%E8%BF%99%E4%B8%AA%E5%B0%B1%E5%8F%AF%E4%BB%A5%E8%BE%93%E5%85%A5%E5%B0%8F%E6%95%B0%E7%82%B9%E4%BA%86.%20%0D%0A%7B%20%0D%0Aevent.returnValue%3Dtrue%3B%20%0D%0A%7D%20%0D%0Aelse%20%0D%0A%7B%20%0D%0Aevent.returnValue%3Dfalse%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%0D%0A%2F%2F%20--%3E%3C%2Fscript%3E"> 
</head> 
<body> 
<input id="txtShow" type="text" onkeydown="checkNum();"/> 
</body> 
</html>

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