不知道为什么出不来
function IsNull(){
var str = document.getElementById("title").value.trim();
if(str.length==0){
alert("对不起,姓名不能为空或者为空格!");
} return false;
} <html:form action="newsave.do" method="post" onsubmit="javascript:return(IsNull());">
function IsNull(){
var str = document.getElementById("title").value.trim();
if(str.length==0){
alert("对不起,姓名不能为空或者为空格!");
} return false;
} <html:form action="newsave.do" method="post" onsubmit="javascript:return(IsNull());">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<script language="javascript">
function submit2()
{
var all = document.getElementById("a").value;
if(all =="")
{
alert("输入不能为空");
return false;
}
else
{
alert("输入的是 :" + all);
}
}
</script>
<input type="text" name="a"/>
<input type="button" value="提交" onclick="submit2()">
</BODY>
</HTML>