验证输入的是否数字
Code
<script language="javaScript">
<!--
function check(form) {
num = "0123456789";
str = form.tel.value;
for(i=0; i<str.length; i++) {
if(num.indexOf(str.charAt(i)) == -1) {
alert("只能输入数字");
return false;
}
}
}
//-->
</script>
验证字母
Code
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript">
<!--
function check(form) {
var frm = document.form1;
var letter = "abcdefghigklmnopqrstuvwxyz";
letter = letter + letter.toUpperCase();
for(i=0; i<frm.user.value.length; i++) {
if(letter.indexOf(frm.user.value.charAt(i)) == -1) {
alert("只能输入字母");
return false;
}
}
}
//-->
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="" onsubmit="return check(this);">
请你输入英文字母：
<label>
<input type="text" name="user" id="user" />
</label>
<label>
<input type="submit" name="button" id="button" value="提交" />
</label>
</form>
</body>
</html>
Code<script language="javaScript">
<!--
function check(form) {
num = "0123456789";
str = form.tel.value;
for(i=0; i<str.length; i++) {
if(num.indexOf(str.charAt(i)) == -1) {
alert("只能输入数字");
return false;
}
}
}
//-->
</script>
Code<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript">
<!--
function check(form) {
var frm = document.form1;
var letter = "abcdefghigklmnopqrstuvwxyz";
letter = letter + letter.toUpperCase();
for(i=0; i<frm.user.value.length; i++) {
if(letter.indexOf(frm.user.value.charAt(i)) == -1) {
alert("只能输入字母");
return false;
}
}
}
//-->
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="" onsubmit="return check(this);">
请你输入英文字母：
<label>
<input type="text" name="user" id="user" />
</label>
<label>
<input type="submit" name="button" id="button" value="提交" />
</label>
</form>
</body>
</html>
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