JavaScript cookie基础操作

javascript操作cookie用document.cookie;

首先是cookie名，对应的值value和有效期

cookie的操作基本上是对字符串的操作和cookie有效期的设置

如下操作

window.onload = function() {

setCookie("loginName", "sunjp", 2);

var cookie = document.cookie;

alert(cookie);

delCookie("loginName1")

alert(getCookie("loginName"));

setCookie("loginName1", "sunjpcookie", 2);

delCookie("loginName1")

alert(getCookie("loginName"));

}

//添加cookie

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());

}

//获得cookie 从cookie中截取对应名称的值

function getCookie(c_name) {

if (document.cookie.length > 0) {

c_start = document.cookie.indexOf(c_name + "=")

if (c_start != -1) {

c_start = c_start + c_name.length + 1

c_end = document.cookie.indexOf(";", c_start)

if (c_end == -1) c_end = document.cookie.length

return unescape(document.cookie.substring(c_start, c_end))

}

}

return ""

}

//删除cookie 把对应的cookie的有效期设置成无效

function delCookie(c_name) {

var exdate = new Date();

exdate.setDate(exdate.getDate() - 1);

var value = getCookie(c_name);

if (value != null) {

document.cookie = c_name + "=" + value + ";expires=" + exdate.toGMTString();

}

}