打开浏览器会出现一个信息提示，再刷新不出现
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<!--# 特效来源：http://www.webjx.com/js -->
<!-- 把下面代码加到<body>区域中 -->
<script>
//specify message to alert
var alertmessage="Welcome to webjx.com \n 这个提示信息只会出现一次哟！"
///No editing required beyond here/////
//Alert only once per browser session (0=no, 1=yes)
var once_per_session=1
function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) { // if cookie exists
offset += search.length
// set index of beginning of value
end = document.cookie.indexOf(";", offset);
// set index of end of cookie value
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}
function alertornot(){
if (get_cookie('alerted')==''){
loadalert()
document.cookie="alerted=yes"
}
}
function loadalert(){
alert(alertmessage)
}
if (once_per_session==0)
loadalert()
else
alertornot()
</script>
[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]