ccw handbook

() Componentwillupdate (Object Nextprops, Object nextstate) Componentdidupdate (Object Prevprops, Object prevstate) Componentwillunmount () In addition, the REACT provides two special state processing functions. Componentwillreceiveprops (Object Nextprops): Called when a loaded component receives a new parameter Shouldcomponentupdate (Object Nextprops, Object nextstate): Called when the component determines whether to re-render For a detailed description of th

://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png "title text" Code and Syntax highlighting codes and syntax highlighting: 标记一小段行内代码：本文是一篇介绍`Markdown`的语法的文章如果高亮的内容包含`号，可以这样写：`` `包裹起来` ``语法高亮：```html``````cssbody{font-size:12px}``````javascriptvar s = "JavaScript syntax highlighting";alert(s);``````phpecho "hello, world!";?>``````pythons = "Python syntax highlighting"print s``` Block Code code grouping (code block): 在该行开头缩进4

Recommender systems handbook 6 This week I saw Chapter 1. The book consists of 25 chapters. From the point of view, this book provides a comprehensive introduction to the recommendation system, and also introduces some specificAlgorithm. There are some mathematical symbols in these formulas that I can't remember. The following is a summary of the first eight chapters:Chapter 1: Introduction to the book;Chapter 2: Data mining methods used in recomme

I read C # threading handbook for less business trips a few days ago, and I still feel a lot of GAINS. Now I want to write my own experiences and see better comments.This book covers a wide range of content. I only want to write something that I think is important but I didn't know before. 1. Thread LifecycleThe system. Threading. Thread class provides the start, stop, suspend, resume, join, and abort thread methods. You can view the thread status t

belong to?Typically used for marketing to define the target population.Orient yourself through cultural capital and economic capital, while thinking about where you want others to position youThe total capital of a person is cultural capital and economic capital15, what will make you happy?Immersion model.Happiness occurs when we are in the following situations:① a close focus on an activity② These activities are our own choice.③ neither challenging enough nor challenging too high④ have a clear

reference is required here: http://docs.djangoproject.com/en/dev/ref/contrib/csrf/ Workaround: Find middleware_classes in settings.py = (' Django.middleware.common.CommonMiddleware ', ' DJANGO.CONTRIB.SESSIONS.MI Ddleware. Sessionmiddleware ', ' django.middleware.csrf.CsrfViewMiddleware ', ' Django.middleware.csrf.CsrfResponseMiddleware ' , # # #添加这句, used for form token validation ' django.contrib.auth.middleware.AuthenticationMiddleware ', ' Django.contrib.messages.middleware.MessageMiddlewar

of the content.VI, I and EMThe I element in HTML4 represents the creation of italic text, and the HTML5 specification gives some examples of use, such as a dream, a technical term, an idea, or a ship name:Instead, the EM element represents an emphasis that can change the meaning of a sentence. One or more words contained in EM are emphasized in the sentence. If you move the EM element, that is, the emphasis on the content changes, the corresponding sentence also has a change in meaning.Seven, a

1. "Force" to obtain a singleton object requires a thread-safe approach, in which the method also guarantees thread safety.Description: Resource-driven classes, tool classes, and Singleton factory classes all need to be noted.2. "Force" when creating threads or thread pools, specify meaningful thread names to facilitate backtracking on errors.3. The Force thread resource must be provided through the thread pool, and it is not allowed to explicitly create threads in the app itself.Description: Th

instance.4. JQuery 1.4 Reference ManualJanuary 22, 2010, updated to jquery version 1.4, This edition is the reference Shawphy 1.4 online version of the production, updated a lot of previous content, not carefully checked before, found that before the online popular CHM version is based on 1.2, 1.3 of the content has not been added, this time to complement the whole. Marked with * 1.3 version of the new additions, @ 1.4 New additions to the content, easy to see.5. Ajax Chinese HandbookAjax is a

resolution.Castshadows: Let the terrain have a shadow. Like the shadows from the peaks.The following 6 parameters render parameter settings for trees or detail objects.The draw option indicates whether to render objects other than terrain. This is useful when you need to adjust the terrain on the terrain where you do all kinds of things.Detaildistance: When the camera exceeds this distance, the details play a stop display.Detaildenstiy: detailed density. Finer granularity of rendering.Treedista

, and the statement "3 greater than or equal to 3" was output.Using the Else statement in a for loopExecutes the statement block of else if the for condition statement is false or if no break is interrupted after the end.For example:names = [' Duyuheng ', ' Duzhaoli ']for name in Names:if name = = "Du": Print (' name: ', name ') Break print ("Loop Name column Table "+name" Else:print ("No looping data!") ") Print (" End loop! ") ")C:\python\python.exe c:/python.py/tiaojianxunhuanyuju.pyCircular

= [' study ', ' Python ', ' is ', ' happy '] #按字符串由短到长排序field. Sort (key=len) print (field)C:\python\python.exe c:/python.py/liebiaofangfa.py[' Is ', ' study ', ' Happy ', ' python ']#按字符串由长到短排序, you need to pass two parametersField.sort (key=len,reverse=true) print (field)C:\python\python.exe c:/python.py/liebiaofangfa.py[' Python ', ' study ', ' Happy ', ' is ']Can do sort after reverse orderFor example:Num=[8,6,1,4,5]num.sort (reverse=true) print (num)C:\python\python.exe c:/python.py/liebia

with the # number and can have a single line or the end of a statement that can be placedFor example:>>> #打印1 +1 results ... print (up to)2Results of >>> print (#打印2 +2)4Everything from the beginning of the # will be ignored.DebuggingWhat happens if I convert a character with int ()?>>> int (' Hello ')Traceback (most recent):File "Valueerror:invalid literal for int. () with base: ' Hello 'Error: ValueError: Invalid text for int (), using radix: "Hello"In variables and keywords, what happens if

' >>> print (name) duyuheng>>> print (name)PythonThe underscore ' _ ' can appear in the variable name* Often used to connect multiple phrasesFor example:>>> n_ame= ' du Yu Heng ' >>> print (n_ame) du Yu HengOther than the above-mentioned combinations are illegal variable names, and there is no use of the keyword as the variable name.There are 33 keywords in *python that cannot be used as variable names.False class finally is returnNone continue for Lambda tryTrue def from Nonlocal whileAnd Del

the minimum value of an element in a tupleFor example:num = (4,2,1,3,5,8) print (' Take out a small number of tuples: ', min (num))C:\python\python.exe c:/python.py/yuanzu.pyTo remove a tuple in small numbers: 1The tuple (SEQ) function is used to convert a list to a tupleFor example:Love = [' I ', ' loving ', ' you ', ' Beauty ', ' Li ', ' ', ' gu ', ' Niang ']mylove=tuple (AI) print (mylove)C:\python\python.exe c:/python.py/yuanzu.py(' I ', ' love ', ' You ', ' Beauty ', ' Li ', ' ', ' gu ', '

= {1:'a', 2:'b'}try: = Mydic[3]except: = Noneprint(x)In fact, the original meaning of our code is this, when we appear keyerror, our x value is none. If our dictionary name is wrong, we want to throw an exception or do something different, but this time, our code will also let the value of x is None.3: Too few snapsOne problem with capturing too little is that when we modify the program, we need to add our exceptions to the except, so we can use a high level exception to deal with this ch

1, download the Chinese package;http://pkgs.fedoraproject.org/repo/pkgs/man-pages-zh-CN/manpages-zh-1.5.1.tar.gz/13275fd039de8788b15151c896150bc4/2. Compile and installTar XF manpages-zh-1.5.1.tar.gzCD manpages-zh-1.5.1./configure--DISABLE-ZHTWMake make install (there may be a permissions issue, preferably with root privileges)3, set environment variables; vim/etc/profile.d/cman.shAlias cman= ' Man-m/usr/local/share/man/zh_cn 'Exit to re-execute the alias file for this settingsource/etc/profile

will continue to run from where it was just paused until the next yield. The generator itself forms a circulator that uses a yield return value each time it is cycled.Here is a generator:Def gen (): a = yield a a = a*8 yield a yield 1000The generator has a total of three yield and three loops when used as a circulator.For I in Gen (): Print IOutput results1008001000Consider one of the following generators:Def Gen (): for I in range (4): yield IIt can also be writtenG

resort to thunder8. Office, installed MS Office, no way, other or almost, Linux under the use of WPS, Linux under the best use.9. Virtual machine, the use of free VirtualBox, pay the forget. It's rarely used anyway.10. Uninstall the software, use the Appcleaner, it can search the relevant location of the software you want to uninstall, or very good11. Telnet, log in to the home Windows computer I use "remote Desktop Connection", non-local LAN I use TeamViewer12. File browser, I installed the Xt

method that does not have the subclass itself, and the parent class has and can inherit (that is, not private). You can extend the functionality of overridden methods in a subclass by super referencing the method of the parent class when overriding the method of the parent class. Hiding is called based on the type of reference (called static methods and member variables), and overrides are called based on the type of object. All of this is based on a very important principle in