您可以简单地使用sessionStorage。因为sessionStorage允许在浏览器窗口关闭时清除所有键值。

看这里:SessionStorage- MDN

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

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.

for (let i = 0; i < localStorage.length; i++) {
    if (localStorage.key(i).indexOf('the-name-to-delete') > -1) {
        arr.push(localStorage.key(i));
    }
}

for (let i = 0; i < arr.length; i++) {
    localStorage.removeItem(arr[i]);
}

有五种方法可供选择:

setItem():将键和值添加到localStorage getItem():通过键从localStorage检索值 removeItem():按键从localStorage中删除一个项 clear():清除所有localStorage key():传递一个数字来检索localStorage的第n个键

您可以使用clear()，该方法在调用时清除该域的所有记录的整个存储。它不接收任何参数。

window.localStorage.clear();

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。