<style type="text/css">
.in_search {
border:1 none;
color:#999999;
float:left;
font-size:14px;
height:18px;
line-height:18px;
margin:3px 2px;
width:253px;
}
</style>
<input name="q" class="in_search" onfocus="if(this.value=='请输入你想要输入的内容'){this.value='';}" onblur="if(this.value==''){this.value='请输入你想要输入的内容';}" type="text" value="请输入你想要输入的内容"/>
<!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" xml:lang="en" lang="en">
<head>
<title>html文本框提示效果 - www.jb200.com</title>
<style type="text/css">
*{
margin:0px;padding:0px;font-size:12px;
}
input{
width:100px;height:20px;border:1px solid #ccc;
}
</style>
</head>
<body>
<script language="
javascript">
function tips(id,str){
var l=document.getElementById(id).offsetLeft+120;
var t=document.getElementById(id).offsetTop;
document.getElementById("tips").innerHTML="提示："+str;
document.getElementById("tips").style.left=l+"px";
document.getElementById("tips").style.top=t+"px";
document.getElementById("tips").style.display="";
}
function outtips(){
document.getElementById("tips").style.display='none';
}
</script>
<div id="tips" style="position:absolute;border:1px solid #ccc;padding:0px 3px;color:#f00;display:none;height:20px;line-height:20px;background:#fcfcfc"></div>
<br />
姓名：<input type="text" id="username" onfocus="tips('username','姓名长度最多16个字符')" onblur="outtips()" />
<br />
密码：<input type="password" id="password" onfocus="tips('password','密码长度必须在3-18位之间')" onblur="outtips()" />
</body>
</html>
