如何更新和删除Cookie？ [英] How to update and delete a cookie ?

问题描述

我需要帮助以了解如何更新值，以及如何删除从此代码创建的 Cookie ！我是新来的 javascript ，所以如果有人可以帮助我很好。

I need help to know how to update values and how to delete a cookie created from this code! I'm new to javascript so ,it's great if anyone can help me.

<script type="text/javascript">
    function getCookie(c_name) {
         var i,x,y,ARRcookies = document.cookie.split(";");
         for (i=0;i<ARRcookies.length;i++) {
              x = ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
              y = ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
              x = x.replace(/^\s+|\s+$/g,"");
              if (x==c_name) {
                  return unescape(y);
              }
          }
    }

    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 check2Cookie() {
         var username=getCookie("username");
         if (username!=null && username!="") {
             username= "0";
             setCookie("username",username,1000);
         }
         else {
             username=" ";
             if (username!=null && username!="") {
                   username= "0";
                   setCookie("username",username,1000);
             }
         }
    }
</script>

这是创建cookie的代码。谢谢。

This is the code for cookie creation .Thank you.

创建代码 setCookie（username，username，1000）;

更新此Cookie并删除此Cookie。

Now how to update this cookie and delete this cookie.

推荐答案

http://www.quirksmode.org/js/cookies.html

更新只是使用createCookie重置

update would just be resetting it using createCookie

function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    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,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name,"",-1);
}

这篇关于如何更新和删除Cookie？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！