本篇文章主要是對JS文本獲得焦點清除文本文字的示例代碼進行介紹，需要的朋友可以過來參考下，希望對大家有所幫助
如下所示： 代碼如下: <!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> <style type="text/css"> .clearFieldBlurred{ color:#ccc; font-style:italic; font-weight:normal; width:150px; } .clearFieldActive{ color:#4e4e4e; font-weight:bold; width:150px; } </style> <script type="text/javascript"> function clearFiled(){ var bbb=document.getElementById("bbb"); if(bbb.value=="bbb"){ bbb.value=''; bbb.className='clearFieldActive'; } } window.document.onmousedown=function(){ var bbb=document.getElementById('bbb'); if(bbb.value==""){ bbb.value='bbb'; bbb.className='clearFieldBlurred'; } } </script> </head> <body> <input type="text" id="aaa" value="aaa" class="clearFieldBlurred" onfocus="if(this.value=='aaa'){this.value='';this.className='clearFieldActive';}" onblur="if(this.value==''){this.value='aaa';this.className='clearFieldBlurred';}"/> <br /> <input type="text" id="bbb" value="bbb" class="clearFieldBlurred" onclick="clearFiled()" /> </body> </html>