我不认为这里提出的解决方案是100%正确的，因为窗口。onbeforeunload事件不仅在浏览器/选项卡关闭时被调用(这是必需的)，而且在所有其他几个事件上也被调用。(可能不需要)

有关可以触发window.onbeforeunload的事件列表的更多信息，请参阅此链接

http://msdn.microsoft.com/en-us/library/ms536907 (VS.85) . aspx

下面是一个简单的测试，看看你在使用本地存储时是否有浏览器支持:

if(typeof(Storage)!=="undefined") {
  console.log("localStorage and sessionStorage support!");
  console.log("About to save:");
  console.log(localStorage);
  localStorage["somekey"] = 'hello';
  console.log("Key saved:");
  console.log(localStorage);
  localStorage.removeItem("somekey");  //<--- key deleted here
  console.log("key deleted:");
  console.log(localStorage);
  console.log("DONE ===");
} else {
  console.log("Sorry! No web storage support..");
}

它为我工作如预期(我使用谷歌Chrome)。 改编自:http://www.w3schools.com/html/html5_webstorage.asp。

There is a very specific use case in which any suggestion to use sessionStorage instead of localStorage does not really help. The use-case would be something as simple as having something stored while you have at least one tab opened, but invalidate it if you close the last tab remaining. If you need your values to be saved cross-tab and window, sessionStorage does not help you unless you complicate your life with listeners, like I have tried. In the meantime localStorage would be perfect for this, but it does the job 'too well', since your data will be waiting there even after a restart of the browser. I ended up using a custom code and logic that takes advantage of both.

I'd rather explain then give code. First store what you need to in localStorage, then also in localStorage create a counter that will contain the number of tabs that you have opened. This will be increased every time the page loads and decreased every time the page unloads. You can have your pick here of the events to use, I'd suggest 'load' and 'unload'. At the time you unload, you need to do the cleanup tasks that you'd like to when the counter reaches 0, meaning you're closing the last tab. Here comes the tricky part: I haven't found a reliable and generic way to tell the difference between a page reload or navigation inside the page and the closing of the tab. So If the data you store is not something that you can rebuild on load after checking that this is your first tab, then you cannot remove it at every refresh. Instead you need to store a flag in sessionStorage at every load before increasing the tab counter. Before storing this value, you can make a check to see if it already has a value and if it doesn't, this means you're loading into this session for the first time, meaning that you can do the cleanup at load if this value is not set and the counter is 0.

这是一个老问题，但上面的答案似乎都不完美。

如果您希望存储身份验证或任何敏感信息，这些信息仅在浏览器关闭时被销毁，那么您可以依赖sessionStorage和localStorage进行跨选项卡消息传递。

基本上，这个想法是:

You bootstrap from no previous tab opened, thus both your localStorage and sessionStorage are empty (if not, you can clear the localStorage). You'll have to register a message event listener on the localStorage. The user authenticate/create a sensitive info on this tab (or any other tab opened on your domain). You update the sessionStorage to store the sensitive information, and use the localStorage to store this information, then delete it (you don't care about timing here, since the event was queued when the data changed). Any other tab opened at that time will be called back on the message event, and will update their sessionStorage with the sensitive information. If the user open a new tab on your domain, its sessionStorage will be empty. The code will have to set a key in the localStorage (for exemple: req). Any(all) other tab will be called back in the message event, see that key, and can answer with the sensitive information from their sessionStorage (like in 3), if they have such.

请注意，此方案不依赖于窗口。Onbeforeunload事件是脆弱的(因为浏览器可以关闭/崩溃而不触发这些事件)。此外，敏感信息存储在localStorage上的时间非常短(因为您依赖于跨选项卡消息事件的transcients更改检测)，因此此类敏感信息不太可能泄漏到用户的硬盘驱动器上。

下面是这个概念的演示:http://jsfiddle.net/oypdwxz7/2/

没有这样的方法来检测浏览器关闭，所以可能你不能在浏览器关闭时删除localStorage，但有另一种方法来处理你可以使用sessionCookies，因为它会在浏览器关闭后销毁。这是我在我的项目中实现的。

8.5年过去了，最初的问题一直没有得到答案。

当浏览器关闭时，没有一个标签。

这个基本代码片段将为您提供两全其美的服务。仅在浏览器会话期间存在的存储(如sessionStorage)，但也可以在选项卡之间共享(localStorage)。

它完全通过localStorage来实现这一点。

function cleanup(){
    // place whatever cleanup logic you want here, for example:
    // window.localStorage.removeItem('my-item')
}

function tabOpened(){
    const tabs = JSON.parse(window.localStorage.getItem('tabs'))
    if (tabs === null) {
        window.localStorage.setItem('tabs', 1)
    } else {
        window.localStorage.setItem('tabs', ++tabs)
    }
}

function tabClosed(){
    const tabs = JSON.parse(window.localStorage.getItem('tabs'))
    if (tabs === 1) {
        // last tab closed, perform cleanup.
        window.localStorage.removeItem('tabs')
        cleanup()
    } else {
        window.localStorage.setItem('tabs', --tabs)
    }
}

window.onload = function () {
    tabOpened();
}

window.onbeforeunload = function () {
    tabClosed();
}