jQuery表單擷取和失去焦點輸入框提示效果

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<!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>無標題文檔</title><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"   type="text/javascript"></script><script type="text/javascript">$(document).ready(function(){$("#focus .input_txt").each(function(){var thisVal=$(this).val();//判斷文字框的值是否為空白,有值的情況就隱藏提示,沒有值就顯示if(thisVal!=""){$(this).siblings("span").hide();}else{$(this).siblings("span").show();}//聚焦型輸入框驗證$(this).focus(function(){$(this).siblings("span").hide();}).blur(function(){var val=$(this).val();if(val!=""){$(this).siblings("span").hide();}else{$(this).siblings("span").show();}});})$("#keydown .input_txt").each(function(){var thisVal=$(this).val();//判斷文字框的值是否為空白,有值的情況就隱藏提示,沒有值就顯示if(thisVal!=""){$(this).siblings("span").hide();}else{$(this).siblings("span").show();}$(this).keyup(function(){var val=$(this).val();$(this).siblings("span").hide();}).blur(function(){var val=$(this).val();if(val!=""){$(this).siblings("span").hide();}else{$(this).siblings("span").show();}})})})</script><style type="text/css">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;}label{display:block;height:40px;position:relative;margin:20px 0;}span{position:absolute;float:left;line-height:40px;left:10px;color:#BCBCBC;cursor:text;}.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;}.input_txt:focus{box-shadow:0 0 4px rgba(255,153,164,0.8);border:solid 1px #B00000;}.border_radius{border-radius:5px;color:#B00000;}h2{font-family:"微軟雅黑";text-shadow:1px 1px 3px #fff;}</style></head><body><form class="border_radius" id="focus">        <h2>聚焦型提示消失  無效果請重新整理</h2>        <label><span>花瓣註冊郵箱</span><input type="text" class="input_txt border_radius"  />        </label>        <label><span>密碼</span><input type="text" class="input_txt border_radius" /></label>    </form><form class="border_radius" id="keydown">    <h2>輸入型提示消失</h2>    <label><span>花瓣註冊郵箱</span><input type="text" class="input_txt border_radius"  />       </label>        <label><span>密碼</span><input type="text" class="input_txt border_radius" /></label>    </form></body></html>

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