JavaScript cookie 【每日一段代码69】
<html>
<head>
<script type="text/javascript">
function getCookie(c_name)
{
if (document.cookie.length>0){
c_start=document.cookie.indexOf(c_name + "=")
if (c_start!=-1){
c_start=c_start + c_name.length+1
c_end=document.cookie.indexOf(";",c_start)
if (c_end==-1) c_end=document.cookie.length
return unescape(document.cookie.substring(c_start,c_end))
}
}
return ""
}
function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays)
document.cookie=c_name+"="+escape(value)+((expiredays==null)? "" : "; expires="+exdate.toGMTString())
}
function checkCookie()
{
username=getCookie('username')
if (username!=null&username!=""){
alert('Welcome again'+username+'!')
}
else{
username=prompt('Please enter your name:',"")
if (username!=null && username!=""){
setCookie('username',username,365)
}
}
}
</script>
</head>
<body onLoad="checkCookie()">
</body>
</html>
