本文實例講述了js控制輸入框獲得和失去焦點時狀態顯示的方法。分享給大家供大家參考。具體實現方法如下：
<!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>邊框變色</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 == '請輸入關鍵字')
{
document.formSearch.keyword.value = '';
document.formSearch.keyword.className = 'SearchKeywordonFocus';
}
}
function keywordblur()
{
if (document.formSearch.keyword.value == '')
{
document.formSearch.keyword.value = '請輸入關鍵字';
document.formSearch.keyword.className = 'SearchKeyword';
}
}
</SCRIPT>
</head>
<body>
<form id="formSearch" name="formSearch" method="post" action="">
<input type="text" name="keyword" class="SearchKeyword" value="請輸入關鍵字" onFocus="keywordfocus();" onBlur="keywordblur();" />
</form>
</body>
</html>
希望本文所述對大家的javascript程序設計有所幫助。