JavaScript不会保存Cookie

Question

I'm using a quick Javascript code (based on a tutorial) to try and create an age screen on a site. However, although the age screen should only pop up once and then be fine for a while, it pops up every refresh. Here's the code I'm using:

<script type="text/javascript">
function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+d.toGMTString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}
function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i < ca.length; i++) {
        var c = ca[i];
        while(c.charAt(0)==' ') c = c.substring(1);
        if(c.indexOf(name) == 0) return c.substring(name.length,c.length);
    }
    return "";
}
function checkCookie() {
    var age = getCookie("allowed");
    if (age != true) {
        age = confirm("you must be 18 or older to enter and view the content on this blog");
    }
    if (age == true) {
        setCookie("allowed", age, 7);
    } else if (age == false) {
        //window.location.replace("http://tumblr.com/dashboard");
    }
    return age;
}
</script>

I've checked every available online resource and tutorial I can find, but nothing explains why this won't save the cookie properly. If I open the console, it recognizes the site creating the cookie, but gives me undefined values for everything.

If I have the console run the checkCookie() function, it returns the proper value depending on whether I clicked 'OK' or 'Cancel' but it still won't actually save that value into the cookie.

Can anyone think of any reason this might be happening?

UPDATE

After changing the age == true checks from boolean checks into strings, it made no difference.

Answer 1

The cookie is probably being saved. But your getCookie method has a typo in it on like 6 c.substring(name,length,c.length);

Instead you should have c.substring(name.length,c.length);

Update

Change the following lines in your checkCookie method to

if (age) {
    setCookie("allowed", age, 7);
}

OR

if (age === true) {
    setCookie("allowed", age, 7);
}

Once the setCookie is called, refresh the browser and you should be able to see the cookie set.

Update 2

getCookie returns a string so it should be age != "true" and confirm returns a boolean so age === true should work

var age = getCookie("allowed");
if (age != "true") {
    age = confirm("you must be 18 or older to enter and view the content on this blog");
}
if (age === true) {
    setCookie("allowed", age, 7);
} else if (age == false) {
    //window.location.replace("http://tumblr.com/dashboard");
}

Answer 2

(typeof age)是字符串，因此您可以将age != true更改为age != 'true' ，其他检查相同，也可以将其转换为布尔值，如!!age != true