JS中使用cookie

1很简单

//就是这样设置cookiedocument.cookie=xxxxxxx;

2清除cookie：

cookie中有一项expires作为失效时间，将其设置为负数就能清空

3下面是W3C给出的官方cookie使用代码，直接引用就行

//设置cookiefunction 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cookiefunction 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cookiefunction clearCookie(name) {    setCookie(name, "", -1);}