文本框中只能是数字输入或者是字母输入

文本框中只能是数字输入或者是字母输入

<script type="text/javascript">

function noNumbers(e)

{

var keynum;

var keychar;

var numcheck;

if(window.event) // IE

{

keynum = e.keyCode;

}

else if(e.which) // Netscape/Firefox/Opera

{

keynum = e.which;

}

keychar = String.fromCharCode(keynum);

numcheck = /\d/;

return  numcheck.test(keychar);

}

</script>

<form>

Type some text (numbers not allowed):

<input type="text" onkeypress="return noNumbers(event)" />

</form>