blocks|key|2710941|text|浏览器中的本地存储仅适用于字符串类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2710942|localStorage.getItem('someItem');
localStorage.setItem('someItem',+'string+value');
localStorage.removeItem('someItem');|code-block|syntax|javascript|2710943|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Localstorage in the browsers work only on the string types
<pre><code>localStorage.getItem('someItem');
localStorage.setItem('someItem', 'string value');
localStorage.removeItem('someItem');
</code></pre>

blocks|key|2710916|text|给出一个值或用函数集项覆盖本地存储中的值，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2710917|localStorage.setItem('token'+,+'your+token+here+');|code-block|syntax|javascript|2710918|为获取该值：|2710919|localStorage.getItem('token')
window.console.log("token+:",localStorage.getItem('token'))|2710920|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

give a value or overwrite the one present in the localstorage with the function set item, like code below :
<pre><code>localStorage.setItem('token' , 'your token here ');
</code></pre>
and for access the value :
<pre><code>localStorage.getItem('token')
window.console.log(&quot;token :&quot;,localStorage.getItem('token'))
</code></pre>

blocks|key|3242840|text|使用localStorage方法设置、获取和删除令牌。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3242841|查看此链接以获得更多详细信息：https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage|offset|length|3242842|为了检查令牌是否存在，您可以这样做：|3242843|const+isAuth+=+!!localStorage.token|code-block|syntax|javascript|3242844|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage^0|0|F|1W|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Use localStorage methods for setting, getting and removing token.
Check this link for more details: <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage</a>
And for checking weather the token exists or not you can do this:
<pre><code>const isAuth = !!localStorage.token
</code></pre>

blocks|key|3242868|text|可以使用removeItem()从本地存储中删除项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3242869|localStorage.removeItem('token')|code-block|syntax|javascript|3242870|您还可以使用函数getItem()检索该项。|3242871|localStorage.getItem('token')|3242872|这将在不存在时返回null。|3242873|3242874|文档|blockquote|3242875|3242876|https://developer.mozilla.org/en-US/docs/Web/API/Storage/getItem|offset|length|3242877|https://developer.mozilla.org/en-US/docs/Web/API/Storage/setItem|3242878|https://blog.logrocket.com/localstorage-javascript-complete-guide/|3242879|entityMap|0|LINK|mutability|MUTABLE|url|1|2^0|0|0|0|0|0|0|0|0|0|1S|0|0|0|1S|1|0|0|1U|2|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1A|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1G|8|@]|9|@$T|1H|U|1I|1|1J]]|A|$]]|$1|V|3|W|5|6|7|1K|8|@]|9|@$T|1L|U|1M|1|1N]]|A|$]]|$1|X|3|Y|5|6|7|1O|8|@]|9|@$T|1P|U|1Q|1|1R]]|A|$]]|$1|Z|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|S]]|16|$5|12|13|14|A|$15|W]]|17|$5|12|13|14|A|$15|Y]]]]

You can use removeItem() to remove items from your localstorage.
<pre><code>localStorage.removeItem('token')
</code></pre>
You can also use the function getItem() to retrieve the item.
<pre><code>localStorage.getItem('token')
</code></pre>
This will return null when it doesn't exist.
<blockquote>
Documentation
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Storage/getItem" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/API/Storage/getItem</a>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Storage/setItem" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/docs/Web/API/Storage/setItem</a>
<a href="https://blog.logrocket.com/localstorage-javascript-complete-guide/" rel="nofollow noreferrer">https://blog.logrocket.com/localstorage-javascript-complete-guide/</a>
</blockquote>

blocks|key|2710876|text|本地存储只能保存字符串。这是一个简单的生活事实。这就是为什么JSON.parse和JSON.stringify是读写本地存储的同义词。null也不例外。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2710877|entityMap^0|U|A|15|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Local storage can only save strings. That is a simple fact of life.
This is why <code>JSON.parse</code> and <code>JSON.stringify</code> are synonymous with reading and writing from and to local storage.
null is no exception.

I am coming from Java dev and new to javascript, can someone explains what is going on.
I am using <code>localStorage</code> to store my token in my browser.
<pre class="lang-js prettyprint-override"><code>localStorage.token = 'xxx'
</code></pre>
When the users sign out, we remove the token, here is the code
<pre class="lang-js prettyprint-override"><code>localStorage.token = null
</code></pre>
If we want to check wether the user is authenticated or not, we check the token
<pre class="lang-js prettyprint-override"><code>const isAuth = localStorage.token !== null
</code></pre>
Here is the thing becomes weird to me. After I marked <code>localStorage.token</code> to <code>null</code>,
the result of <code>localStorage.token !== null</code> is still true !
 
I had done some investigation,
I logged the <code>localStorage</code> object and found out the <code>token</code> variable is <code>&quot;null&quot;</code> instead of <code>null</code>.
Here is my assumption.
When the browser needs to store the localStorage, it iterates inside the object fields, after finding the <code>null</code> object, it use <code>toString</code> to store the final form?

Null object is String type in localStorage

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我来自Java，刚开始使用javascript，有人能解释一下发生了什么吗？我使用localStorage将令牌存储在浏览器中。localStorage.token = 'xxx'当用户签出时，我们删除令牌，这是代码localStorage.token = null如果我们想检查用户是否经过身份验证，我们将检查令牌。const isAuth = localStorage.token !== nul

问空对象是localStorage中的字符串类型。
EN

回答 5

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问空对象是localStorage中的字符串类型。EN

回答 5

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问空对象是localStorage中的字符串类型。
EN