s设置cookie的简单方法

//取得cookie
function getCookie(name) {
 var nameEQ = name + "=";
 var ca = document.cookie.split(';');    //把cookie分割成组
 for(var i=0;i < ca.length;i++) {
 var c = ca[i];                      //取得字符串
 while (c.charAt(0)==' ') {          //判断一下字符串有没有前导空格
 c = c.substring(1,c.length);      //有的话，从第二位开始取
 }
 if (c.indexOf(nameEQ) == 0) {       //如果含有我们要的name
 return unescape(c.substring(nameEQ.length,c.length));    //解码并截取我们要值
 }
 }
 return false;
}

//清除cookie
function clearCookie(name) {
 setCookie(name, "", -1);
}

//设置cookie
function setCookie(name, value, seconds) {
 seconds = seconds || 0;   //seconds有值就直接赋值，没有为0，这个根php不一样。
 var expires = "";
 if (seconds != 0 ) {      //设置cookie生存时间
 var date = new Date();
 date.setTime(date.getTime()+(seconds*1000));
 expires = "; expires="+date.toGMTString();
 }
 document.cookie = name+"="+escape(value)+expires+"; path=/";   //转码并赋值
}

删除所有cookie

var cookies = document.cookie.split(";");
    for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i];
        var eqPos = cookie.indexOf("=");
        var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
        document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
    }
if(cookies.length > 0)
{
    for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i];
        var eqPos = cookie.indexOf("=");
        var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
    var domain = location.host.substr(location.host.indexOf('.'));
        document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/; domain=" + domain;
    }
}

调用方法

setCookie("test","tank",1800);         //设置cookie的值，生存时间半个小时
alert(getCookie('test'));                     //取得cookie的值，显示tank
clearCookie("test");                           //删除cookie的值
alert(getCookie('test'));                     //test对应的cookie值为空，显示为false.就是getCookie最后返的false值。

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