首先是动态修改数据框的值:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>XXX</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script language="JavaScript" src="../js/jquery-1.4.2.js"></script>
<style type="text/css">
div,span{
width: 140px;
height: 140px;
margin: 20px;
background: #9999CC;
border: #000 1px solid;
float:left;
font-size: 17px;
font-family:Roman;
}
div.mini{
width: 30px;
height: 30px;
background: #CC66FF;
border: #000 1px solid;
font-size: 12px;
font-family:Roman;
}
</style>
<!--引入jquery的js库-->
</head>
<body>
<input type="text" value="用户邮箱/手机号/用户名" id="b1"/><br>
<input type="password" value="" id="b2"/><br>
<input type="button" value="登陆" id="b3"/>
<br>
</body>
<script language="JavaScript">
$("#b1").focus(function(){
if($(this).val()==this.defaultValue){
$(this).val("");
}
});
$("#b1").blur(function(){
if($(this).val()==""){
$(this).val(this.defaultValue);
}
});
</script>
</html>
再来是是动态修改placeholder的值:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>XXX</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script language="JavaScript" src="../js/jquery-1.4.2.js"></script>
<style type="text/css">
div,span{
width: 140px;
height: 140px;
margin: 20px;
background: #9999CC;
border: #000 1px solid;
float:left;
font-size: 17px;
font-family:Roman;
}
div.mini{
width: 30px;
height: 30px;
background: #CC66FF;
border: #000 1px solid;
font-size: 12px;
font-family:Roman;
}
</style>
<!--引入jquery的js库-->
</head>
<body>
<input type="text" placeholder="用户邮箱/手机号/用户名" id="b1"/><br>
<input type="password" value="" id="b2"/><br>
<input type="button" value="登陆" id="b3"/>
<br>
</body>
<script language="JavaScript">
$("#b1").focus(function(){
$(this).attr('placeholder',"");
});
$("#b1").blur(function(){
if($(this).val()==""){
$(this).attr('placeholder','${sessionScope.xxxxxxx}');
}
});
</script>
</html>
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