在B/S中常用JavaScript(实用型)

HTM网页

<META HTTP-EQUIV="pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT">
或者<META HTTP-EQUIV="expires" CONTENT="0">

ASP网页

Response.Expires = -1
Response.ExpiresAbsolute = Now() - 1
Response.cachecontrol = "no-cache"
PHP网页
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");

19. 检查一段字符串是否全由数字组成

<script language="＆#106avascript"><!--
function checkNum(str){return str.match(/D/)==null}
alert(checkNum("1232142141"))
alert(checkNum("123214214a1"))
// --></script>

20. 获得一个窗口的大小

document.body.clientWidth,document.body.clientHeight

21. 怎么判断是否是字符

if (/[^x00-xff]/g.test(s)) alert("含有汉字");

else alert("全是字符");

22.TEXTAREA自适应文字行数的多少

<textarea rows=1 name=s1 cols=27 onpropertychange="this.style.posHeight=this.scrollHeight">

</textarea>

23. 日期减去天数等于第二个日期