文字框提示樣式，滑鼠點選獲得焦點時提示內容消失
阿新 • • 發佈：2019-02-17
<!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>文字框提示樣式</title>
<style type="text/css">
<!--
.a1 {
color: #CCCCCC;
}
.a2 {
color: #000;
}
-->
</style>
</head>
<body>
<input name="n" type="text"/>
<input name="n1" type="text"/>
<script language="javascript">
window.onload=function(){
s('n','Your message1');s('n1','Your message2')
}
function g(a){return document.getElementById(a)}
function s(n,v){
with(g(n)){
className='a1';value=v;
onfocus=function(){if(value==v)value='';className='a2'}
onblur=function(){if(value==''){value=v;className='a1'}}
}
}
</script>
</body>
</html>