为什么当账号栏为空，移动焦点后，没有显示提示内容，新手不明所以也不知道那有问题，坐等热心人
RT
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">JavaScript
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<script>
function chekName(){
var name=document.getElementById("textfield").value;
var pass=document.getElementById("textfield2").value;
if(name==""){
document.getElementById("tishizhanghao").innerHTML="账号不能为空";
}
}
</script>
<table width="444" height="212" border="1">
<tr>
<td width="65">账号</td>
<td width="168"><form id="form1" name="form1" method="post" action="">
<label>
<input type="text" name="textfield" onblur="chekName()" />
</label>
</form> </td>
<td width="189"><span id="tishizhanghao"></span></td>
</tr>
<tr>
<td>密码</td>
<td><form id="form2" name="form2" method="post" action="">
<label>
<input type="text" name="textfield2" />
</label>
</form> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td><form id="form3" name="form3" method="post" action="">
<label>
<input type="submit" name="Submit" value="提交" />
</label>
<label>
<input type="submit" name="Submit2" value="重置" />
</label>
</form> </td>
<td> </td>
</tr>
</table>
</body>
</html>
[解决办法]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<script>
function chekName(){
//除ie以外的浏览器的getElementById不对name起作用
//var name=document.getElementById("textfield").value;
//var pass=document.getElementById("textfield2").value;
//另外你用户名密码应当在同一个form下面，而不是拆成两个form，
//一次提交只会提交一个form下面的所有表单项内容
var name= form1.textfield.value;
var pass= form1.textfield2.value;
if(name==""){
document.getElementById("tishizhanghao").innerHTML="账号不能为空";
}
}
</script>
<table width="444" height="212" border="1">
<tr>
<td width="65">账号</td>
<td width="168"><form id="form1" name="form1" method="post" action="">
<label>
<input type="text" name="textfield" onblur="chekName()" />
</label>
<!--去掉一个form </form> --> </td>
<td width="189"><span id="tishizhanghao"></span></td>
</tr>
<tr>
<td>密码</td>
<td><!--去掉一个form <form id="form2" name="form2" method="post" action=""> -->
<label>
<input type="text" name="textfield2" />
</label>
</form> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td><form id="form3" name="form3" method="post" action="">
<label>
<input type="submit" name="Submit" value="提交" />
</label>
<label>
<input type="submit" name="Submit2" value="重置" />
</label>
</form> </td>
<td> </td>
</tr>
</table>
</body>
</html>
[解决办法]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
function chekName(){
var name=document.getElementById("textfield").value;
if(name==""){
document.getElementById("tishizhanghao").innerHTML="账号不能为空";
}
}
</script>
<form id="form1" name="form1" method="post" action="">
<table width="444" height="212" border="1">
<tr>
<td width="65">账号</td>
<td width="168">
<label>
<input type="text" name="textfield" id="textfield" onblur="chekName()" />
</label>
</td>
<td width="189"><span id="tishizhanghao"></span></td>
</tr>
<tr>
<td>密码</td>
<td colspan="2">
<label>
<input type="text" name="textfield2" />
</label>
</td>
</tr>
<tr>
<td colspan="3">
<label>
<input type="submit" name="Submit" value="提交" />
</label>
<label>
<input type="submit" name="Submit2" value="重置" />
</label>
</td>
</tr>
</table>
</form>
</body>
</html>