SEARCH KEYWORD -- Front end


  Understand GoLang WaitGroup internals and how it works

Background Before getting into the main content, let me give a brief introduction to WaitGroup and its related background knowledge. Here, the focus is on the basic usage of WaitGroup and the fundamental knowledge of system semaphores. For those who are familiar with these, you can skip this section directly. WaitGroup WaitGroup is one of the most common concurrency control techniques in Golang, and its function can be roughly compared to the join() in concurrency control of other languages' mul...

   GOLANG,WAITGROUP,SOURCE CODE     2023-04-26 08:02:01

  Office will finally be on iOS and Android in 2013

It was confirmed that Office would land on iOS and Android platforms by Microsoft in October. Microsoft claims that Office will be on these two platforms in some way. Now many sources indicated that Office will be officially launched at the beginning of 2013. It is reported that the mobile version of Office will be free on Android and iOS, it allows users to view Office documents. Mobile version of Office also requires a Microsoft account just like SkyDrive and OneNote App. After login, users c...

   Office,Android,iOS,Office 365     2012-11-07 11:57:50

  iWatch is coming to us before 2014

There are a variety of rumors around Apple iWatch. But according to Bloomberg,  Apple's smart watch is expected to be on sale at the end of this year.It is reported that iWatch might have phone and location tracking capabilities, it will also have a built-in pedometer and some health monitoring sensors. Previously Apple supplier and Gorilla Glass manufacturer Corning said that iWatch would be available only after at least 3 years. But recently Apple retained some iWatch related patents, it...

   iWatch,Apple,Google Glass     2013-03-04 18:09:42

  Redis Cluster and Common Partition Techniques in Distributed Cache

In this post, I will discuss a few common partition techniques in distributed cache. Especially, I will elaborate on my understanding on the use of Redis Cluster. Please understand that at the time of writing, the latest version of Redis is 4.0.10. Many articles on the same topic have a different idea from this post. This is mainly because, those articles are probably outdated. In particular, they may refer to the Redis Cluster implementation in Redis 3. Redis Cluster has been improved...

   REDIS,DISTRIBUTED CACHE,CLOUD COMPUTING     2019-01-17 08:10:37

  One thought about JavaScript exception handle

Due to network, browser and cache issues, the JS executed in production may produce different results from the testing environments. Sometimes they may produce exceptions. Front-end developers may encounter this kind of exceptions frequently. But how to log and use them is seldomly considered by them. Actually, exception handling includes two steps : log and use. 1. Log Regarding to log error, this is relatively convenient, since in each browser, there is one interface called window.onerror. win...

   JaavScript,Log,Exception,Email     2013-03-18 12:50:21

  Additional steps need to implement to setup shadow-boxV2 OPTEE on Raspberry PI

We followed the Shadow-box v2 project from the https://github.com/kkamagui/shadow-box-for-arm to set up the trustZone on Raspberry PI modeB to protect the Linux Kernel. But got a problem when doing the step: [3.6.5. Activate Shadow-Box for ARM and Start Secure Pi!] to create the hash for the memory area. The result is not shown. If you met the same problem, this is what I did to fix the problem on my PI: 1.1  When we do the step [3.5.1. Copy OP-TEE OS with Shadow-Box for ARM and N...

   HARDWARE,RASPBERRY PI     2019-05-20 08:52:55

  A list of English abbreviations

When we read emails or short message on our phone, we will often see some words such as FYI or LOL etc. Do you know their meanings, right? But some of the abbreviations we may not know or cannot remember clearly. Here is a list of English abbreviations which may be useful to you in the future when you want to check them.      Numbers:    &n"sp;   2 = to/too 　　2B or not 2B = To be or not to be 　　4 = for 　　...

   Abbreviation,English,Summary     2012-07-05 23:41:06

  Say good bye to netbook

Asus and Acer are the last two manufacturers of netbooks, but these two companies announced that they would not manufacture netbooks starting from January 1, 2013. Prior to them, Samsung, Hewlett-Packard and Dell stopped production of the netbooks. This means that the life cycle of netbook officially ended.Back to 2009, the U.S. market research firm ABI Research was very optimistic about netbook's future, they said netbook would open a new era for PC market and predicted netbook shipments would ...

   Netbook,Tablet PC, Comparison     2013-01-02 11:53:33

  JavaScript efficiency catch up

JavaScript is a very flexible language, we can write JavaScript code freely with various styles, different kinds of codes will have different execution efficiency. Here we summarize some tips we get from our development. Efficiency of JavaScript itself JavaScript has execution context chain, closures, prototype inheritance, eval etc. It brings us some magic features, but it also introduces the performance issue, if we don't use them properly, it will affect the codes execution efficiency. 1. Glo...

   JavaScript,efficiency,event delegation,eval     2013-04-02 04:08:46

  Samsung loses $12.3 billion in one day

Following the court decision last Friday on Samsung's infringement of Apple's patents, Apple did not stop, they immediately submitted an application to the court to ban some Samsung smartphones, including 8 types of Samsung smartphones sold in United States. Apple listed in detail in the document what patents these phones infringed. These 8 smartphones are: Galaxy S 4G Galaxy S2 (AT&T) Galaxy S2 (Skyrocket) Galaxy S2 (T-Mobile) Galaxy S2 Epic 4G Galaxy S Showcase Droid Charge Galaxy Prevail...

   Samsung,Apple,Patent,Lose     2012-08-27 21:37:24

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