<strong>第一种方法</strong>: <br>基于HTML5 input标签的新特性 - placeholder 。另外,x-webkit-speech 属性可以实现语音输入功能。 <br><div class="codetitle"> <span><a style="CURSOR: pointer" data="31669" class="copybut" id="copybut31669" onclick="doCopy('code31669')"><u>复制代码</u></a></span> 代码如下:</div> <div class="codebody" id="code31669"> <br><div><input type="email" name="email" spellcheck="false" placeholder="邮 箱" autofocus tabindex="1" x-webkit-speech></div> <br><div><input type="password" name="password" placeholder="密 码" tabindex="2"></div> <br> </div> <br><strong>第二种方法</strong>: <br>用span模拟,定位span,借助JS键盘事件判断输入,确定span里的内容显示隐藏。 <br><div class="codetitle"> <span><a style="CURSOR: pointer" data="23383" class="copybut" id="copybut23383" onclick="doCopy('code23383')"><u>复制代码</u></a></span> 代码如下:</div> <div class="codebody" id="code23383"> <br> <br> <br> <br><meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <br><title>无标题文档</title> <br><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script> <br><script type="text/javascript"> <BR>$(document).ready(function(){ <BR>$("#focus .input_txt").each(function(){ <BR>var thisVal=$(this).val(); <BR>//判断文本框的值是否为空,有值的情况就隐藏提示语,没有值就显示 <BR>if(thisVal!=""){ <BR>$(this).siblings("span").hide(); <BR>}else{ <BR>$(this).siblings("span").show(); <BR>} <BR>//聚焦型输入框验证 <BR>$(this).focus(function(){ <BR>$(this).siblings("span").hide(); <BR>}).blur(function(){ <BR>var val=$(this).val(); <BR>if(val!=""){ <BR>$(this).siblings("span").hide(); <BR>}else{ <BR>$(this).siblings("span").show(); <BR>} <BR>}); <BR>}) <BR>$("#keydown .input_txt").each(function(){ <BR>var thisVal=$(this).val(); <BR>//判断文本框的值是否为空,有值的情况就隐藏提示语,没有值就显示 <BR>if(thisVal!=""){ <BR>$(this).siblings("span").hide(); <BR>}else{ <BR>$(this).siblings("span").show(); <BR>} <BR>$(this).keyup(function(){ <BR>var val=$(this).val(); <BR>$(this).siblings("span").hide(); <BR>}).blur(function(){ <BR>var val=$(this).val(); <BR>if(val!=""){ <BR>$(this).siblings("span").hide(); <BR>}else{ <BR>$(this).siblings("span").show(); <BR>} <BR>}) <BR>}) <BR>}) <BR></script> <br><style type="text/css"> <BR>form{width:400px;margin:10px auto;border:solid 1px #E0DEDE;background:#FCF9EF;padding:30px;box-shadow:0 1px 10px rgba(0,0,0,0.1) inset;} <BR>label{display:block;height:40px;position:relative;margin:20px 0;} <BR>span{position:absolute;float:left;line-height:40px;left:10px;color:#BCBCBC;cursor:text;} <BR>.input_txt{width:398px;border:solid 1px #ccc;box-shadow:0 1px 10px rgba(0,0,0,0.1) inset;height:38px;text-indent:10px;} <BR>.input_txt:focus{box-shadow:0 0 4px rgba(255,153,164,0.8);border:solid 1px #B00000;} <BR>.border_radius{border-radius:5px;color:#B00000;} <BR>h2{font-family:"微软雅黑";text-shadow:1px 1px 3px #fff;} <BR></style> <br> <br> <br><form class="border_radius" id="focus"> <br><h2>聚焦型提示语消失</h2> <br><label><span>花瓣注册邮箱</span><input type="text" class="input_txt border_radius"></label> <br><label><span>密码</span><input type="text" class="input_txt border_radius"></label> <br> </form> <br><form class="border_radius" id="keydown"> <br><h2>输入型提示语消失</h2> <br><label><span>花瓣注册邮箱</span><input type="text" class="input_txt border_radius"></label> <br><label><span>密码</span><input type="text" class="input_txt border_radius"></label> <br> </form> <br> <br> <br> </div>