js操作本地cookie

document.cookie = "username=John Doe; expires=Thu, 18 Dec 2023 12:00:00 UTC; path=/";

var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
    var cookie = cookies[i].trim();
    if (cookie.indexOf("username=") == 0) {
        var username = cookie.substring("username=".length, cookie.length);
    }
}

document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";

// 设置一个安全的 Cookie
document.cookie = "username=John Doe; expires=Thu, 18 Dec 2023 12:00:00 UTC; path=/; secure; HttpOnly";

// 读取 Cookie
function getCookie(name) {
    var value = "; " + document.cookie;
    var parts = value.split("; " + name + "=");
    if (parts.length == 2) return parts.pop().split(";").shift();
}

var username = getCookie("username");
console.log(username);

// 删除 Cookie
function deleteCookie(name) {
    document.cookie = name + '=; Max-Age=-99999999;';
}

deleteCookie("username");