鼠标放在框里时默认的字消失_bpm 鼠标放上字消失-优快云博客

<!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=utf-8" />
<title>无标题文档</title>
<style type="text/css">

</style>
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
<script type="text/javascript">
   $(function(){
       //登陆框
       $("#address").focus(function(){
               var text_val=$(this).val();
               if(
                   text_val=="请输入邮箱地址"
               ){
                   $(this).val("");
                   };
           })
       $("#address").blur(function(){
               var text_val=$(this).val();
               if(
                   text_val==""
               ){
                   $(this).val("请输入邮箱地址");
                   };
           })
               })
</script>
</head>

<body>

    <br /><br />
    <input type="text" id="address" value="请输入邮箱地址"/><br /><br />
    <input type="password" id="password" /><br /><br />
    <input type="button" value="登陆"/>
</body>
</html>