2个有焦点时文字消失或变淡效果

2个有焦点时文字消失或变淡效果

有焦点时文字消失。
<!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"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/> <title>请输入关键字查询 - 豪情</title> </head> <body> <input type="text" name="" id="txt1" value="请输入关键字查询" /> <script type="text/javascript"> var oTxt = document.getElementById('txt1'); var bWrite = true; oTxt.onfocus = function(){ if(bWrite){ this.value = ''; bWrite = false; } } oTxt.onblur = function(){ if(this.value == ''){ this.value = this.defaultValue; bWrite = true; } } </script> </body> </html>

有焦点时文字变淡。
<!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"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/> <title>请输入关键字查询加强版 - 豪情</title> <style type="text/css"> *{ margin:0; padding:0;} body{font:12px/1.5 arial;background: #fff;} .username{ position:relative;margin:30px auto; 500px;} .default{ position:absolute;top:10px;left:2px;padding:0 8px; z-index:1; color:#8B9096;cursor:text;} .txt{ position:relative; height:35px; padding:0 6px;border-radius:5px; line-height:35px;background: #fff; border:1px solid #9DADC5;} </style> </head> <body> <div class="username"> <label class="default" id="default" for="txt1">请输入关键字查询</label> <input type="text" name="" id="txt1" class="txt" value="" /> </div> <script type="text/javascript"> var oTxt = document.getElementById('txt1'); var oDefault = document.getElementById('default'); var sOld = oDefault.innerHTML; oTxt.onfocus = function(){ oDefault.style.color = '#ccc'; } oTxt.onblur = function(){ oDefault.style.color = '#8B9096'; } oTxt.onpropertychange = oTxt.oninput = toChange; oTxt.value.length > 0 && (oDefault.innerHTML = ''); function toChange(){ if(oTxt.value.length > 0){ oDefault.innerHTML = ''; } else { oDefault.innerHTML = sOld; bWrite = false; } } </script> </body> </html>
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原文地址：https://www.cnblogs.com/jikey/p/3044694.html