按OK后如何停止javascript警报显示

本文介绍了按OK后如何停止javascript警报显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 如果我的Facebook收件箱中有东西，我想显示一个提醒。我认为这可以很容易地使用用户脚本完成...这是我迄今为止（感谢 userscripts 论坛）：

document.addEventListener（DOMNodeInserted，function（）{ var count; if（（count = parseInt（document.getElementById（fb_menu_inbox_unread_count）。textContent））> 0） alert（你有+ count +新消息+（count == 1？ ：s）+。）; }，true）;

这个功能很好，除了在点击确定之后，消息卡在循环中，并保持弹出向上。点击关闭警报后是否有办法停止讯息？

解决方案

添加一个跟踪多少条消息的变量有最后一次警报，如果该变量没有改变，则不显示。

某些东西：

document.addEventListener（DOMNodeInserted， function（）{ var count = parseInt（document.getElementById（fb_menu_inbox_unread_count）.textContent）; if（count> 0&& count！= lastCount）{ alert（你有+ count +新消息+（count == 1？：s） +。）;}，true）; } lastCount = count; //记住计数以避免连续警报。

此外，我将避免像原始帖子一样编写所有代码。如果需要，它会更难读取和更改。

I want to show an alert if I have something in my Facebook inbox. I think it can be easily accomplished using userscripts... this is what I have so far (thanks to the guys at the userscripts forums):

document.addEventListener("DOMNodeInserted", function() { var count; if ((count=parseInt(document.getElementById("fb_menu_inbox_unread_count").textContent)) > 0) alert("You have "+count+" new message"+(count==1 ? "" : "s")+"."); }, true);

This works great, except the message gets stuck in a loop after clicking "OK", and keeps popping up. Is there a way to stop the message after I click dismiss the alert?

解决方案

Add a variable which keeps track of how many messages there were last alert, and do not show if that variable hasn't changed.

Something like:

document.addEventListener( "DOMNodeInserted", function() { var count = parseInt(document.getElementById("fb_menu_inbox_unread_count").textContent); if (count > 0 && count != lastCount) { alert("You have "+count+" new message"+(count==1 ? "" : "s")+"."); }, true); } lastCount = count; // Remember count to avoid continuous alerts.

Also, I would avoid writing code all in one like, as you did in your original post. It makes it more difficult to read and change if need be.