javascript cookies
can anyone tell me开发者_运维知识库 about automatic cookies in JavaScript while clicking a button or URL of a webpage? It sets for me and I can't delete that also...
var expDate = new Date();
expDate.setYear( parseInt(expDate.getYear())+10);
document.cookie="";
var x = "$user=$val; expires="+expDate.toUTCString();
Here i have two buttons called 'view' and 'save'. If i click the 'save' button this cookie should be set... but when i click the 'view' button a cookie is set. i cant delete tht cookie too
I find the method explained in this article at quirksmode.org to be working just fine. — Mabye give that a try?
Best code to understand cookie in javascript
Just save my code as html file and open into browser you willeasily understand cookie concept
<!DOCTYPE html>
<html>
<head>
<script>
function getCookie(c_name)
{
var c_value = document.cookie;
var c_start = c_value.indexOf(" " + c_name + "=");
if (c_start == -1)
{
c_start = c_value.indexOf(c_name + "=");
}
if (c_start == -1)
{
c_value = null;
}
else
{
c_start = c_value.indexOf("=", c_start) + 1;
var c_end = c_value.indexOf(";", c_start);
if (c_end == -1)
{
c_end = c_value.length;
}
c_value = unescape(c_value.substring(c_start,c_end));
}
return c_value;
}
function setCookie(c_name,value,exdays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
document.cookie=c_name + "=" + c_value;
}
function checkCookie()
{
var 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>
加载中,请稍侯......
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