推荐理由：MS-DOS 是 20 世纪的操作系统了，它诞生在 20 世纪的末尾，然后在 21 世纪开始时被 Windows 取而代之。对于大多数人来说在 20 世纪的末尾他们才刚刚出生而已，对于 MS-DOS 的熟悉度肯定是比不上 Windows 的。不过虽然 Windows 10 明天突然开源了这种事情应该是不会发生，但是微软把这个古老的操作系统 MS-DOS 开源了，对它有兴趣的朋友可以去看看这个项目；兴许 20 年或者 50 年以后， Windows 10 也会变成古老的操作系统在 GitHub 上开源吧。
今日推荐英文原文：《Cookies vs. LocalStorage: What’s the difference?》作者：Faith Chikwekwe
推荐理由：Cookies 是服务器在用户端暂存的数据，而 LocalStorage 则是服务器在用户端进行的更大的数据存储，这篇文章为我们对比了这两者的不同
Cookies vs. LocalStorage: What’s the difference?
Cookies — Small, but Mighty
First, we’ll start by exploring basic information about cookies. We’ll also go over some of their pros and cons. So, what are cookies? According to whatarecookies.com, they are small text files that are placed on a user’s computer by a website. They hold a very small amount of data at a maximum capacity of 4KB. Cookies are used in different ways, such as in storing the pages visited on a site or a user’s login information. They are limited in that they can only store strings.
Many secure websites employ cookies to validate their users’ identities after they’ve logged in to prevent them from having to re-enter their credentials on every page. Another use for cookies is to customize or adjust user experience based on limited browsing history on the site.
Two Types of Cookies
There are two types of cookies: persistent cookies and session cookies. Session cookies do not contain an expiration date. Instead, they are stored only as long as the browser or tab is open. As soon as the browser is closed, they are permanently lost. This type of cookie might be used to store a banking user’s credentials while they are navigating within their bank’s website since their information would be forgotten as soon as the tab is closed.
Persistent cookies do have an expiration date. These cookies are stored on the user’s disk until the expiration date and then permanently deleted. They can be used for other activities such as recording a user’s habits while on a particular website in order to customize their experience every time they visit.
LocalStorage — A More Permanent Solution
After HTML5 came out, many uses of cookies were replaced by the use of LocalStorage. This is because LocalStorage has a lot of advantages over cookies. One of the most important differences is that unlike with cookies, data does not have to be sent back and forth with every HTTP request. This reduces the overall traffic between the client and the server and the amount of wasted bandwidth. This is because data is stored on the user’s local disk and is not destroyed or cleared by the loss of an internet connection. Also, as mentioned before, LocalStorage can hold up to 5MB of information. This is a whole lot more than the 4KB that cookies hold.
Uses of LocalStorage
In my back-end web development course, we discussed cases where LocalStorage would be superior to cookies. An example of a good use of LocalStorage might be in an application used in regions without a persistent internet connection. My course instructor, Dani Roxberry, built such an application in the past and used LocalStorage to protect and store data collected in areas with spotty WiFi or data connections.
In order for this to be a good use of LocalStorage, the threat level of the data stored in this situation would have to be very low. To protect client privacy, it would be good to upload the data when connection is re-established and then delete the locally stored version. Additionally, it would be advantageous to encrypt data that was being stored so that it would not be easily hacked. In our class discussion, we also established that highly vulnerable data, such as financial information, could not be stored or secured properly using LocalStorage in this way.
While these storage options have their positives and negatives, they both have applications in modern web development. Cookies are smaller and send server information back with every HTTP request, while LocalStorage is larger and can hold information on the client side.
When you make your next application, think about these various uses and decide which type of storage is right for you.