如何让 Javascript 警报只显示一次，永远? [英] How do I make a Javascript alert display only once, ever?

问题描述

我在 Javascript 方面很糟糕，但不幸的是，我需要完成这一项任务.我需要一个 Javascript 警报只显示一次——不是每个浏览器会话一次，而是只显示一次永远.我正在为学校比赛做一个项目；警报将与 Internet Explorer 与我的网站不兼容的方式有关，建议使用 Chrome 或 Firefox.但是，我不想用弹出窗口来纠缠评委，所以最好只出现一次.我在网上找到了下面显示的代码，但我无法使其正常工作.它可能就像某个地方缺少括号一样简单——同样，我不擅长 Javascript，只擅长 HTML 和 CSS.:P 如果鼓励替代代码执行我的请求，那么无论如何，建议它！谢谢大家！

I'm terrible at Javascript, but unfortunately, I need this one task completed. I need a Javascript alert to only display once--not once per browser session, but only once ever. I'm working on a project for a school competition; the alert will pertain to how Internet Explorer isn't compatible with my site and Chrome or Firefox is recommended. However, I don't want to pester the judges with pop-ups, so it only appearing up once would be best. I found the code that's displayed below online, but I can't make it work correctly. It may be something as simple as a parenthesis missing somewhere--again, I'm not good with Javascript, just HTML and CSS. :P If alternative code is encouraged to carry out my request, then by all means, suggest it! Thanks to all!

<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>

<!--[if IE]>    
    <script type="text/javascript">
        $(document).one(function() { alert("You are using Internet Explorer to view this webpage.  Your experience may be subpar while using Internet Explorer; we recommend using an alternative internet browser, such as Chrome or Firefox, to view our website."); } );
    </script>
<![endif]-->

推荐答案

one 不是您所需要的，因为页面刷新会覆盖所有内存".

one is NOT what you need as a page refresh will override all the 'memory'.

您很可能正在寻找 localStorage，或者，如果您使用的是版本 8 之前的 Internet Explorer，请使用 cookie:

You are most likely looking for localStorage or, if you are using internet explorer prior to version 8, use cookies:

    <script type="text/javascript">
        var alerted = localStorage.getItem('alerted') || '';
        if (alerted != 'yes') {
         alert("You are using Internet Explorer to view this webpage.  Your experience may be subpar while using Internet Explorer; we recommend using an alternative internet browser, such as Chrome or Firefox, to view our website.");
         localStorage.setItem('alerted','yes');
        }
    </script>

对于 8 之前的 IE 版本，您需要使用 cookie，因为不支持 localStorage.这是完全相同的概念，只是方法不同.看看这个问题来实现您页面上的 cookie.

For IE versions prior to 8 you need to use cookies, since there is not suppor for localStorage. It's the exact same concept, just different methods. Take a look at this question for implementing cookies on your page.

从示例中复制代码后，你应该有 2 个函数 - createCookie() 和 getCookie().

After you copied the code from the example, you should have 2 functions - createCookie() and getCookie().

var createCookie = function(name, value, days) {
....
//copy it from the other question
..
}

function getCookie(c_name) {
....
//copy it from the other question
..
}

<!--[if IE]>  
    <script type="text/javascript">
                var alerted = getCookie('alerted') || '';
                if (alerted != 'yes') {
                 alert("You are using Internet Explorer to view this webpage.  Your experience may be subpar while using Internet Explorer; we recommend using an alternative internet browser, such as Chrome or Firefox, to view our website.");
                 createCookie('alerted','yes',365);//cookies expires after 365 days
                }
            </script>
<![endif]-->

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