<html>
<head>
<meta charset="UTF-8">
</head>
<script>
function return_value(e){
var e = e || window.event;
var charCode=e.keyCode || e.charCode;
if(charCode<48||charCode>75)
{
alert("对不起,你输入的不是数字字符!");
e.returnValue=false;
}
}
</script>
<body>
<textarea name="textarea" onKeyPress="return return_value(event)"></textarea>
<!-- onKeyPress="return return_value(event) 支持firefox、IE、chrome
onKeyPress="return_value() 只支持IE、chrome
-->
</body>
</html>
只能输入字母的
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<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>
<body>
<form>
<input type="text" onkeypress="return noNumbers(event)" />
</form>
</body>
</html>