function setCookie(name, value, {expires, path, domain, secure}){
var cookieStr = encodeURIComponent(name) + "=" + encodeURIComponent(value);
if(expires){
cookieStr += ";expires=" + afterOfDate(expires);
}
if(path){
cookieStr += ";path=" + path;
}
if(domain){
cookieStr += ";domain=" + domain;
}
if(secure){
cookieStr += ";secure";
}
document.cookie = cookieStr;
}
//获取n天后的日期
function afterOfDate(n){
var d = new Date();
var day = d.getDate();
d.setDate(n + day);
return d;
}
function getCookie(name){
var cookieStr = decodeURIComponent(document.cookie);
var start = cookieStr.indexOf(name + "=");
if(start == -1){
return null;
}else{
//查询从start位置开始遇到的第一个分号
var end = cookieStr.indexOf(";", start);
if(end == -1){
end = cookieStr.length;
}
//进行字符串提取
var str = cookieStr.substring(start, end);
var arr = str.split("=");
return arr[1];
}
}
function removeCookie(name){
document.cookie = encodeURIComponent(name) + "=;expires=" + new Date(0);
}
/*
【注】在使用一个方法实现三个功能的时候。
通过传入参数的数量识别：
设置cookie
$cookie(name, value);
$cookie(name, value, {});
获取cookie
$cookie(name);
删除cookie
$cookie(name, null);
*/
function $cookie(name){
//判断传入参数的个数
switch(arguments.length){
case 1:
return getCookie(name);
break;
case 2:
if(arguments[1] == null){
removeCookie(name);
}else{
setCookie(name, arguments[1], {});
}
break;
default:
setCookie(name, arguments[1], arguments[2]);
break;
}
}
转载于千锋教育 码农雨飞老师，经验证无误