<script>
function CheckForm(){
var a=document.getElementsByTagName("input");
for (var i=0;i<a.length;i++){
if (a[i].type.toLowerCase()=="text"){
if (a[i].value==""){
alert("有空值!");
a[i].focus();
return false;
}
}
}
}
</script>
<form method="POST" action="" onsubmit="return CheckForm();">
.................</form>
function CheckForm(){
var a=document.getElementsByTagName("input");
for (var i=0;i<a.length;i++){
if (a[i].type.toLowerCase()=="text"){
if (a[i].value==""){
alert("有空值!");
a[i].focus();
return false;
}
}
}
}
</script>
<form method="POST" action="" onsubmit="return CheckForm();">
.................</form>
function CheckForm(){
var a=document.getElementsByTagName("input");
for (var i=0;i<a.length;i++){
if (a[i].type.toLowerCase()=="text"){
if (a[i].value==""){
alert("不能是空值!");
a[i].focus();
return false;
}
if (!/^\d+$/g.test(a[i].value)){
alert("必须是非负整数!");
a[i].focus();
return false;
}
}
}
return true;
}
</script>