最近，我听说我的一个朋友在面试时遇到了一个关于sessionStorage的难题。说实话，我自己对此也不是很熟悉。面试官的问题是：sessionStorage是否能在多个选项卡之间共享数据？这引发了我对这个话题的兴趣，我决定深入了解一下。
❒ 会话存储特性
我们进行了更多的探讨，发现sessionStorage和localStorage有一些相似之处，但也存在显著差异。sessionStorage与localStorage相似，但数据不持久。每个页面打开时，都会创建一个唯一的页面会话，并且这个会话仅对该特定选项卡有效。只要该选项卡或浏览器保持打开状态，页面会话就会持续存在，即使在页面重新加载或恢复后也不会消失。关闭选项卡会清空数据，这与基于会话的特性密不可分。
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02localStorage和sessionStorage对比
❒ 数据持久性差异
localStorage的数据持久化，只要我们不主动删除，它就会一直存在。而sessionStorage则不同，关闭选项卡或浏览器会结束会话并清除其中的数据。这一点对于经常需要在不同会话之间切换的用户来说显得尤为重要。
❒ 同一网站下数据共享
接下来，面试官问到了关于同一网站下localStorage数据共享的问题。我的朋友回答得很自信：“这很简单！同一个网站的不同选项卡或窗口之间，数据是可以共享的。”为了验证这个说法，我们可以尝试在window对象上设置一个名称来验证这一点。然而，这一测试显示出结果与预期不符，这表明同一网站下的不同选项卡中，localStorage数据不可共享，需要更详细的验证。
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03sessionStorage的更多探讨
❒ 页面会话和数据关联
在深入探讨localStorage数据共享的同时，我们转向了另一个相关概念——会话存储（sessionStorage）。与localStorage类似，sessionStorage也提供了在浏览器中存储数据的功能。然而，它们之间有一个关键的区别：每个选项卡有独立页面会话，sessionStorage数据只在该会话中有效。每当一个文档被加载到浏览器的特定选项卡中时，就会创建一个唯一的页面会话，并且这个会话仅对该特定选项卡有效。
❒ 跨选项卡的数据复制
此外，值得注意的是，使用相同的URL在多个选项卡或窗口中打开页面时，会为每个选项卡或窗口分别创建sessionStorage。这意味着在一个选项卡中所做的更改不会影响到其他选项卡中的数据。但是，当通过window.open或链接打开新页面时，新页面会复制上一个页面的sessionStorage。因此，在新页面中，我们仍然能够获取到在旧页面上设置的值。
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