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JS设置cookie,删除cookie

作者:网页模板
类型:文章教程
点击次数:
发布时间:2018-07-10 11:46
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js的cookie使用起来非常麻烦,因为它就是一个字符串,设置和读取都不方便,下面提供了三种方法,都是简化cookie的使用方法,设置获取直接调用函数,传个参数即可:

第一种:(这个是w3c官网的代码)
<script>
//设置cookie
function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+d.toUTCString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}
//获取cookie
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) != -1) return c.substring(name.length, c.length);
    }
    return "";
}
//清除cookie  
function clearCookie(name) {  
    setCookie(name, "", -1);  
}  
function checkCookie() {
    var user = getCookie("username");
    if (user != "") {
        alert("Welcome again " + user);
    } else {
        user = prompt("Please enter your name:", "");
        if (user != "" && user != null) {
            setCookie("username", user, 365);
        }
    }
}
checkCookie();
</script>

第二种:

<script>
//JS操作cookies方法!

//写cookies
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());
   }
 
//读取cookies
function getCookie(name)
{
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
 
    if(arr=document.cookie.match(reg))
 
        return (arr[2]);
    else
        return null;
}

//删除cookies
function delCookie(name)
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
    if(cval!=null)
        document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}
//使用示例
setCookie('username','Darren',30)
alert(getCookie("username"));
</script>

第三个例子

<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <head>
        <script language="JavaScript" type="text/javascript">
            
            function addCookie(objName, objValue, objHours){//添加cookie
                var str = objName + "=" + escape(objValue);
                if (objHours > 0) {//为0时不设定过期时间,浏览器关闭时cookie自动消失
                    var date = new Date();
                    var ms = objHours * 3600 * 1000;
                    date.setTime(date.getTime() + ms);
                    str += "; expires=" + date.toGMTString();
                }
                document.cookie = str;
                alert("添加cookie成功");
            }
            
            function getCookie(objName){//获取指定名称的cookie的值
                var arrStr = document.cookie.split("; ");
                for (var i = 0; i < arrStr.length; i++) {
                    var temp = arrStr[i].split("=");
                    if (temp[0] == objName)
                        return unescape(temp[1]);
                }
            }
            
            function delCookie(name){//为了删除指定名称的cookie,可以将其过期时间设定为一个过去的时间
                var date = new Date();
                date.setTime(date.getTime() - 10000);
                document.cookie = name + "=a; expires=" + date.toGMTString();
            }
            
            function allCookie(){//读取所有保存的cookie字符串
                var str = document.cookie;
                if (str == "") {
                    str = "没有保存任何cookie";
                }
                alert(str);
            }
            
            function $(m, n){
                return document.forms[m].elements[n].value;
            }
            
            function add_(){
                var cookie_name = $("myform", "cookie_name");
                var cookie_value = $("myform", "cookie_value");
                var cookie_expireHours = $("myform", "cookie_expiresHours");
                addCookie(cookie_name, cookie_value, cookie_expireHours);
            }
            
            function get_(){
                var cookie_name = $("myform", "cookie_name");
                var cookie_value = getCookie(cookie_name);
                alert(cookie_value);
            }
            
            function del_(){
                var cookie_name = $("myform", "cookie_name");
                delCookie(cookie_name);
                alert("删除成功");
            }
        </script>
    </head>
    <body>
        <form name="myform">
            <div>
                <label for="cookie_name">
                    名称
                </label>
                <input type="text" name="cookie_name" />
            </div>
            <div>
                <label for="cookie_value">
                值
                </lable>
                <input type="text" name="cookie_value" />
            </div>
            <div>
                <label for="cookie_expireHours">
                多少个小时过期
                </lable>
                <input type="text" name="cookie_expiresHours" />
            </div>
            <div>
                <input type="button" value="添加该cookie" onclick="add_()"/><input type="button" value="读取所有cookie" onclick="allCookie()"/><input type="button" value="读取该名称cookie" onclick="get_()"/><input type="button" value="删除该名称cookie" onclick="del_()"/>
            </div>
        </form>
</body>
</html>

注意:

chrome浏览器在本地获取不到cookie。必须在服务器上才可以。如果是本地的话,你可以放到local的www目录下面。

Google Chrome只支持在线网站的cookie的读写操作,对本地html的cookie操作是禁止的。所以下面的代码如果你写在一个本地的html文件中,将弹出的对话框内容为空。

document.cookie = "Test=cooo";
alert(document.cookie);

如果这个页面是在线网站的内容,则会正常显示cookie内容Test=cooo等等。 (责任编辑:网页模板)
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