<script language="javascript">
function fun(){
o =document.getElementsByTagName("INPUT")
for(i=0;i<o.length;i++)
{
if(o[i].type=="text" && o[i].value=="")
{
o[i].focus()
return false
}
}
return true
}
</script>
function fun(){
o =document.getElementsByTagName("INPUT")
for(i=0;i<o.length;i++)
{
if(o[i].type=="text" && o[i].value=="")
{
o[i].focus()
return false
}
}
return true
}
</script>
function fun(){
o =document.getElementsByTagName("INPUT")
for(i=0;i<o.length;i++)
{
if(o[i].type=="text" && o[i].value=="")
{
o[i].focus()
alert("请输入")
return false
}
}
return true
}
</script>
<body>
<form name="form1" method="post" action="" onSubmit="return fun();">
<p>姓名:<input type="text" name="name"></p>
<p>性别:<input type="text" name="sex"></p>
<p>
<input type="submit" name="Submit" value="提交">
</p>
</form>
</body>
function fun(obj){
for(var i=0;i<obj.elements.length;i++)
{
if(obj.elements[i].type=="text" && obj.elements[i].value=="")
{
alert('请填写完整!');
return false;
}
}
}
</script><body>
<form name="form1" method="post" action="" onSubmit="return fun(this);">
<p>姓名:<input type="text" name="name"></p>
<p>性别:<input type="text" name="sex"></p>
<p>
<input type="submit" name="Submit" value="提交">
</p>
</form>
</body>