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" class="SearchKeyword" 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。