本文实例讲述了js控制输入框获得和失去焦点时状态显示的方法。分享给大家供大家参考。具体实现方法如下：
<!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=gb2312" /> <title>边框变色</title> <style type="text/css"> <!-- .SearchKeyword {border:1px solid #797A75;width: 202px;color: #CDCDCD;font-size:12px;} .SearchKeywordonFocus {border:1px solid #ABCD3A;width: 202px;color: #000000;font-size:12px;} --> </style> <script language="javascript"> function keywordfocus() { if (document.formSearch.keyword.value == '请输入关键字') { document.formSearch.keyword.value = ''; document.formSearch.keyword.className = 'SearchKeywordonFocus'; } } function keywordblur() { if (document.formSearch.keyword.value == '') { document.formSearch.keyword.value = '请输入关键字'; document.formSearch.keyword.className = 'SearchKeyword'; } } </SCRIPT> </head> <body> <form id="formSearch" name="formSearch" method="post" action=""> <input type="text" name="keyword" value="请输入关键字" onFocus="keywordfocus();" onBlur="keywordblur();" /> </form> </body> </html>希望本文所述对大家的javascript程序设计有所帮助。