understanding flexbox

nesting2. For CSS and JS1) Try to use the outer chain CSS style sheet and JS script. The structure, performance and behavior are divided into three blocks, which conform to the norm. At the same time, improve the page rendering speed, improve the user experience.2) style as little as possible with the line style sheet, so that the structure and performance of the separation, tag ID and class attributes such as the name to see explanatory, the less the label, loading faster, user experience, cod

In the end, how high is the height of this line-height line:In the inline box model, there is a line boxes, this thing is invisible, the work of this thing is wrapped in every word. A line of text boxes. For example, "Iverson retired" The 5 words, if they are displayed in a row, you Iverson again, sorry, only a line boxes cover you; but "Chun Brother pure Man" 5 words, if the vertical writing, one line, that is really enough man, a word to cover the lines boxes, So a total of five line boxes. Li

instance=new Singletonclass ();135 } 136 } 137 }138 return instance;139 } $ }*/141 /***142 * Recommended Usage143 */144 /*Public class singletonclass{145 Private Singletonclass () {}146 static inner class of//java147 private static Class singletonclassinstance{148 private static final Singletonclass instance=new Singletonclass ();149 } Max Public static Singletonclass getinstance () {151 return singletonclassinstance.instance; the

, Hp's Alpha and Pa-risc series, and the Sun's UltraSPARC Series. Using the Harvard bus structure, single-cycle execution instructions, can achieve efficient pipeline operation, oriented to high-level language.The complex instruction set cisc, the program each instruction serially executes sequentially, this kind of control is relatively simple, but the computer parts utilization is low, the instruction is unequal, the instruction number is many, therefore the programming and the design processo

Understanding of the continuum hypothesis in macroscopic mechanics:Macroscopic mechanics (such as fluid mechanics, elasto-plastic mechanics, etc.) are the objects of a large number of molecules, at this time each set constitutes a small micro-body, the whole object is made up of the countless small micro-bodies continuously without gaps in the composition. Because we only need to pay attention to the nature of the objects on each set, such as density,

ThreadLocal: simple understanding and threadlocal understandingIn the code of the java open-source project, you can see the ThreadLocal attribute in a class: private static ThreadLocal I saw ThreadLocal while reading a book, but suddenly I couldn't remember its usefulness .. I was surprised to find that I had read the book. So I checked it online immediately.It originally meant the local variable of the thread. ThreadLocal is more like a tool class fo

If you encounter this problem at work, you only know the alignment of the vertical-align attribute settings. Therefore, you need to thoroughly understand the vertical-align function and sort it out by the way. First, let's take a look at some vertical-align attributes: Value Description Baseline Default value. The element is placed on the base line of the parent element. Sub Vertical align text subscript. Super Vertical Alignment

Preliminary understanding of GCD and understanding of GCD // (1) use an asynchronous function to add tasks to the concurrent queue. // conclusion: Enable three subthreads at the same time-(void) test1 {// 1. obtain the global concurrent queue dispatch_queue_t queue = dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); // 2. after adding a task to the queue, You can execute the task // asynchrono

An in-depth understanding of Linux Network Technology-Virtual Device initialization summary and a deep understanding of linuxOverview a virtual device is an abstraction built on one or more real devices. There are many to many mappings between virtual devices and real devices, but not all combinations can be defined or supported by the kernel.The following lists some common Virtual Devices: Bonding // bindi

Understanding of fork () functions, and understanding of fork FunctionsAuthor:Wang Shanshan, a lecturer at Huaqing vision embedded College. For those who are new to Unix/Linux operating systems and Write multi-process programs in Linux, fork is one of the most difficult concepts to understand: it returns two values after one execution. First, let's look at the prototype of the fork function: # I nclude # I

GCD encapsulation of personal understanding and application, gcd encapsulation of understandingPersonal Understanding and applications encapsulated by GCD Features > GCD encapsulation frees us from tedious Method Memory and enables direct and fast application. Usage 1. Drag nine GCD files in the project into your project (you 'd better create a folder to save these files for easy management !).

First understanding heat map, first understanding heat Recently, the project asked me to use js Code to implement heat map. A brother in the same group then turned it into an actionscript code based on my js Code. So I searched the internet for a lot of information on heat map implementation: 1. Google Analytic Google Analytics heat map is a new version of Web Page clickthrough visualization tool called Web

Deep understanding of Java Virtual Machine notes-class loading process, deep understanding of virtual machinesI. LoadingThe Loading stage is a stage of the Class Loading process. In the loading phase, the virtual machine must complete the following three tasks:A. Get the binary byte stream that defines this class using the full limit name of a class.B. Convert the static storage structure represented by thi

First understanding of PHP (1) basic syntax, first understanding of php basic syntax I have been preparing to learn PHP, but there was always a problem some time ago, which was delayed for a while. Catch up now! This series only talks about some of my views on PHP, not the nature of the tutorial. In addition, I am a little white, just write casually, please pat. I have studied c, java, python, and HTML. If

In-depth understanding of URL encoding in the Web, in-depth understanding of weburl Web development is inseparable from URLs. URLs are URLs. network standards stipulate that only letters and numbers [0-9a-zA-Z] and some special symbols "$-_. +" are allowed! * '(), "[Excluding parentheses], and reserved words can be directly used for URL without encoding. Therefore, to make our website accessible normally,

Java basics: Understanding and understanding of native keywords Writer: BYSocket) Weibo: BYSocket Douban: BYSocket Navicat is a hashCode method in the source code of java. lang. Object:? 1 public native int hashCode(); Why is there a navicat? This is what I want to learn. So today, The bricklayer wants to summarize navicat.1. Understand native, namely JNI and Java Native Interface All lang

First understanding of Swoole in PHP, first understanding of PHPSwoole Swoole is a PHP advanced Web development framework. It is not designed to improve website performance, but to improve website development efficiency. Minimum Performance Loss in exchange for maximum development efficiency. Using the Swoole framework, you can develop a complex Web function in a short time. Official definition: Swoole: red

Understanding of pure c struct and c ++ struct, and understanding of c struct // Main. cpp // If the file name is. the end of cpp indicates that this is a c ++ source program. // in the c ++ source program, the role of class is exactly the same as that of struct, // except for their default member attributes (the class is private by default, // struct is common by default), and struct has this pointer, and

03-queue group (understanding), 03-queue group understanding 1 # import "XZViewController. h "2 3 // 1. download two images: large image, LOGO 4 // 2. merge two images. 5 // 3. 6 7 @ interface XZViewController () 8 @ property (weak, nonatomic) IBOutlet UIImageView * imageView; 9 @ property (nonatomic, strong) UIImage * image1; 10 @ property (nonatomic, strong) UIImage * image2; 11 @ end 12 13 @ implementati

A deep understanding of memory leaks in JavaScript programs and a deep understanding of javascript Garbage collection frees us from allowing us to focus on application logic rather than memory management. However, garbage collection is not magical. Understand how it works, and how to make it retain the memory that should have been released a long time ago, you can achieve faster and more reliable applicatio