１.
.....
<style>
input { my:expression(doStyle(this))}
</style>
<script language="JavaScript">
<!--
function doStyle(e){
if(e.type=="text") e.style.color="red";
if(e.type=="password") e.style.color="blue";
}
//-->
</script>
</head>
<body>
<input type="password">
<input type="text" name="" value="abc">
2.
.....
<style>
.a {font-size: 12px; color: #FF00000}
</style>
<script language=javascript>
var a = document.getElementsByTagName("input");
for (var i=0; i<a.length; i++)
{
if(a[i].type=="text") a[i].className = "a"; //所有type=text的input都会用a这个样式了
}
</script>
.....