/**

* 写入cookies
*/
function setCookie(name, value) {
var time = "1d"; //默认一天失效
var strsec = getsec(time);
var exp = new Date();
exp.setTime(exp.getTime() + strsec * 1);
document.cookie = name + "=" + escape(value) + ";expires=" + exp.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();
}

/**
* 写入cookie
* 可自定义过期时间
*/
function setCookie(name, value, time) {
var strsec = getsec(time);
var exp = new Date();
exp.setTime(exp.getTime() + strsec * 1);
document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}

/**
* 获取时间
* s：秒，如20秒为 s20；
* h：小时，如12小时为 h12；
* d：天，如30天为 d30
* @param {[type]} str [description]
* @return {[type]} [description]
*/
function getsec(str) {
var str1 = str.substring(1, str.length) * 1;
var str2 = str.substring(0, 1);
if (str2 == "s") {
return str1 * 1000;
} else if (str2 == "h") {
return str1 * 60 * 60 * 1000;
} else if (str2 == "d") {
return str1 * 24 * 60 * 60 * 1000;
}
}

// 实例
setCookie("name","value","s20");