//写cookies function setCookie(name, value) { var Days = 30; var exp = new Date(); exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000); document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString(); } //读取cookie function getCookie(cookie_name) { var allcookies = document.cookie; //索引长度,开始索引的位置 var cookie_pos = allcookies.indexOf(cookie_name); // 如果找到了索引,就代表cookie存在,否则不存在 if (cookie_pos != -1) { // 把cookie_pos放在值的开始,只要给值加1即可 //计算取cookie值得开始索引,加的1为“=” cookie_pos = cookie_pos + cookie_name.length + 1; //计算取cookie值得结束索引 var cookie_end = allcookies.indexOf(";", cookie_pos); if (cookie_end == -1) { cookie_end = allcookies.length; } //得到想要的cookie的值 var value = unescape(allcookies.substring(cookie_pos, cookie_end)); } return value; } //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(); }