Javascript 写入document.cookie需要多长时间

我想知道写入document.cookie需要多长时间。设置cookie并重新定向到另一页时遇到边缘情况，并且未设置document.cookie。桌面（Chrome、firefox）和iphone/平板电脑（safari）的性能似乎有所不同

当我添加一个500毫秒的超时设置时，似乎在所有情况下都能正常工作

//写曲奇

   function set_cookie(name, value ) {
        var date =  new Date();
        date.setTime(date.getTime() + (365 * 24 * 60 * 60 * 1000)); 
        var cookie = name + "=" + value + "; expires=" + date.toGMTString() + ";";
        document.cookie = cookie;

    }

//阅读饼干

function read_Cookie(name) {

        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) == 0) {
                var cVal = c.substring(nameEQ.length, c.length);
                return cVal;
            }
        }
        return null;
    }

---

JavaScript本质上是单线程的，因此在编写cookie之前不应该执行重定向，无论它需要多长时间（几乎是瞬间的）。尽管如此，正如在会议上指出的那样，情况可能并不总是如此。为了减轻这一点，您可能会考虑使用jQuery的延迟对象：

function set_cookie(name,value,deferred) { // added deferred argument
    var date =  new Date();
    date.setTime(date.getTime() + (365 * 24 * 60 * 60 * 1000)); 
    var cookie = name + "=" + value + "; expires=" + date.toGMTString() + ";";
    document.cookie = cookie;
    deferred.resolve();
}

var deferred = $.Deferred();

deferred.done(function() {
    window.location.href = "";
});

$("#goToAppButton").click(function() {
    if ($("#chkDontShow").attr("checked") == "checked") {
        set_cookie("IgnoreInAppLink","web",deferred);
    } else {
        deferred.resolve();
    }
}

---

在没有超时的情况下，您对

$.Deferred

的使用不会比OP的代码有任何改进。撇开这一点不谈，函数不应该将延迟作为参数，而应该返回一个承诺。

function set_cookie(name,value,deferred) { // added deferred argument
    var date =  new Date();
    date.setTime(date.getTime() + (365 * 24 * 60 * 60 * 1000)); 
    var cookie = name + "=" + value + "; expires=" + date.toGMTString() + ";";
    document.cookie = cookie;
    deferred.resolve();
}

var deferred = $.Deferred();

deferred.done(function() {
    window.location.href = "";
});

$("#goToAppButton").click(function() {
    if ($("#chkDontShow").attr("checked") == "checked") {
        set_cookie("IgnoreInAppLink","web",deferred);
    } else {
        deferred.resolve();
    }
}