我可以通知客户端javascript中的cookie更改 [英] can i be notified of cookie changes in client side javascript

问题描述

我可以在客户端javascript中以某种方式跟踪Cookie（对于我的域）的更改。例如，如果cookie被更改，删除或添加，则会调用一个函数

Can I somehow follow changes to cookies (for my domain) in my client side javascript. For example a function that gets called if a cookie gets changed , deleted or added

按优先顺序

• 标准跨浏览器


• 跨浏览器


• 浏览器特定


• 扩展/插件

• standard cross browser
• cross browser
• browser specific
• extension / plugin

为什么？因为我在窗口/标签＃1中依赖的cookie可以在窗口/标签＃2中更改。

Why? because cookies I depend on in window / tab #1 can get changed in window / tab #2.

我发现chrome允许扩展通知cookie更改。但那是我最不喜欢的选项

I found out that chrome allows extensions to be notified of cookies changes. But thats my least favorite option

推荐答案

一种选择是编写一个定期检查cookie变化的函数：

One option is to write a function that periodically checks the cookie for changes:

var checkCookie = function() {

    var lastCookie = document.cookie; // 'static' memory between function calls

    return function() {

        var currentCookie = document.cookie;

        if (currentCookie != lastCookie) {

            // something useful like parse cookie, run a callback fn, etc.

            lastCookie = currentCookie; // store latest cookie

        }
    };
}();

window.setInterval(checkCookie, 100); // run every 100 ms

• 此示例使用闭包来表示持久性内存。外部函数立即执行，返回内部函数，并创建一个私有范围。


• window.setInterval


• This example uses a closure for persistent memory. The outer function is executed immediately, returning the inner function, and creating a private scope.
• window.setInterval

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