按OK后如何停止javascript警报显示 [英] How to stop javascript alert from showing after pressing ok

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.

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