使用JS封装Cookie

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
        window.onload = function(){
            //传参举例：addCookie("score", "998", 1, "/", "127.0.0.1");
            addCookie = function(key,value,day,path,domain){
                var index = window.location.pathname.lastIndexOf('/');
                //slice()方法可从已有的数组中返回选定的元素，从0到index('/')
                var currentPath = window.location.pathname.slice(0,index);
                // 1.处理默认保存的路径
                path = path || currentPath;
                // 2.处理默认保存的domain
                domain = domain || document.domain;
                // 3.处理Cookie保存的时间
                if(!day){
                    document.cookie = key + "=" + value + ";expires=" + date.toGMTString() + ";path=" + path + ";domain=" + domain + ";";
                }else{
                    var date = new Date();
                    date.setDate(date.getDate() + day);
                    document.cookie = key + "=" + value + ";expires=" + date.toGMTString() + ";path=" + path + ";domain=" + domain + ";";
                }
            }
            function getCookie(key) {
                var res = document.cookie.split(";");
                for(var i = 0; i < res.length; i++){
                    var temp = res[i].split("=");
                    if(temp[0].trim() === key){
                        return temp[1];
                    }
                }
            }
            console.log(getCookie("name"));
            // 默认情况下只能删除默认路径中保存的cookie, 如果想删除指定路径保存的cookie, 那么必须在删除的时候指定路径才可以
            function delCookie(key, path) {
                addCookie(key, getCookie(key), -1, path);
            }
            delCookie("name", "/");
        }    
    </script>
</head>
<body>
    
</body>
</html>