JavaScript判断文本框输入是否为空
<script Language="JavaScript">
function ChkFields() {
if (document.myform.UserName.value=='') {
window.alert ("请输入用户名！");
myform.UserName.focus();
return false
}
if (document.myform.UserName.value.Length<=2) {
window.alert ("请用户名长度必须大于2！");
myform.UserName.focus();
return false
}
if (document.myform.Pwd.value.length<3) {
window.alert ("新密码长度大于等于6！");
myform.Pwd.focus();
return false
}
if (document.myform.Pwd.value=='') {
window.alert ("请输入新密码！");
myform.Pwd.focus();
return false
}
if (document.myform.Pwd1.value=='') {
window.alert ("请确认新密码！");
myform.Pwd1.focus();
return false
}
if (document.myform.Pwd.value!=document.myform.Pwd1.value) {
window.alert ("两次输入的新密码必须相同！");
return false
}
return true
}
</script>
<body>
<form method="POST" action="UserSave.asp" name="myform" onsubmit="return ChkFields()">
