编写了一个函数,想限制字符长度,可是一直不成功,请教高手啊~~
function lengthless(username,4)
{
if(window.document.form1.username.value.length<4)
{
window.alert("不能少于4位!");
document.form1.username.focus();
return false;
}
return true;
}调用的时候:onBlur="return lengthless(username,4);"请大家指教~!
function lengthless(username,4)
{
if(window.document.form1.username.value.length<4)
{
window.alert("不能少于4位!");
document.form1.username.focus();
return false;
}
return true;
}调用的时候:onBlur="return lengthless(username,4);"请大家指教~!
<head>
<script language="JavaScript" type="text/javascript">
function lengthless(username,s) {
if(username.length <4 ){
window.alert("不能少于4位!");
document.form1.username.value="";
document.form1.username.focus();
return false;
}
return true;
}
</script>
</hrad>
<body>
<form method="post" name="form1">
<input type="text" name="username" onBlur="return lengthless(this.value,'4');" >
</form>
</body>
</html>