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Flexbox, a more elegant layout

item when Flex is applied? The added width is 90px, so the width of the last leftmost item is 190px.We just mentioned that grow and shrink are actually twins, actually they are really like, shrink said when the total width of the item is larger than the container, in order to get the item to fill the container, each item reduces the width. But the formulas are not the same. Why? Because it doesn't matter when you add, but when you subtract, if you only calculate the shrink value given, it's lik

Elegant handling of Android database upgrade issues

Originally completed on: 2015-04-27 19:28:22Provides a way to gracefully handle Android database upgrade issues directly on the code:1 packageCom.example.databaseissuetest; 2 3 ImportAndroid.content.Context; 4 ImportAndroid.database.sqlite.SQLiteDatabase; 5 ImportAndroid.database.sqlite.SQLiteOpenHelper; 6 ImportAndroid.text.TextUtils; 7 ImportAndroid.util.Log; 8 9 public class Databasehelper extendsSqliteopenhelper {Ten public static final String db_name = "Jjtest"; one-to-one static final stri

JAVA-Elegant logging (log4j combat)

.encoding=utf-8Log4j.appender.a3.append=trueLog4j.appender.a3.maxfilesize=2mbLog4j.appender.a3.maxbackupindex=5Log4j.appender.a3.layout=org.apache.log4j.patternlayoutlog4j.appender.a3.layout.conversionpattern=%-5p%d [%t]%c{3}.%m-%m%n? 1 The configuration file hasLog4j.logger.test=debugLog4j.additivity.test.xml=falseLog4j.logger.test.xml=debug,a3In this example, the inheritance relationship is canceled by Log4j.additivity.test.xml=false, so that the XML log is onl

[Tips] to make null value processing of C # more elegant,

[Tips] to make null value processing of C # more elegant, Reference Http://www.codeproject.com/Articles/739772/Dynamically-Check-Nested-Values-for-IsNull-Values? Msg = 4895299 # xx4895299xx Http://devtalk.net/csharp/chained-null-checks-and-the-maybe-monad/ Introduction Processing of null values in C # has always been an unpleasant task. Suppose there are the following classes: public class Union { public string Name { get; set; } } public class Dep

Write better, more elegant JavaScript event handling code using AMPLIFYJS and jquery

= Global.amplify = {publish:function (topic) {if (typeof topic!== "string") {throw NE W Error ("You must provide a valid topic to publish."); var args = slice.call (arguments, 1), topicsubscriptions,subscription,length,i = 0,ret;if (!subscriptions[topic]) {RET Urn true;} topicsubscriptions = subscriptions[topic].slice (); for (length = topicsubscriptions.length; i More specific API use, you can refer to the following 2 articles:Brief analysis of source code of AMPLIFYJS: Event distributionExten

Guava Study Notes: Preconditions elegant validation parameters

above will be poorly readable, And the reusability will be far from enough. The Guava Class Library provides a tool class for parameter check-Preconditions class, which can greatly simplify the pre-judgment and processing of parameters in our code, let's make it easier and more elegant to verify the input parameters of the method. Let's take a look at the Preconditions class usage example: Preconditions () 8, "peida"-9, "peida" 8, "" 8, getPersonByPr

Python crawler tutorial-elegant HTTP library requests (2) and pythonrequests

Python crawler tutorial-elegant HTTP library requests (2) and pythonrequests Preface Urllib, urllib2, urllib3, httplib, and httplib2 are HTTP-related Python modules. If you look at the Python Module name, you will find it anti-human. What's worse, these modules are very different in Python2 and Python3, if the business code needs to be compatible with both 2 and 3, writing will crash. Fortunately, there is another amazing HTTP library called requests,

Use the require_once question in the function to explore the elegant configuration file definition method recommendation

$ g_levelConfig [$ level];}}Var_dump (getNameByLeval (1 ));Var_dump (getNameByLeval (2 ));In this case, the level. config. php configuration file must be included no matter whether the getNameByLeval function is used. It is not cost-effective. 2. Include and apply FunctionsCopy codeThe Code is as follows:Function getNameByLeval ($ level ){$ Level = intval ($ level );Global $ g_levelConfig; // Add codeRequire_once 'level. config. php ';If (! Isset ($ g_levelConfig [$ level]) {Return false;} Else

Elegant generation of PDFs in HTML

Key code"height:100%; margin:0; Overflow:hidden ;">Elegant generation of PDFs in HTML

Compile the elegant JavaScript_ibm with functional programming technology

Because functional programming uses a completely different way of organizing programs, programmers who are used to using imperative examples may find functional programming a little hard to learn. In this article, you will learn some examples about how to use the functional style and use JavaScript to write good and elegant code. I will discuss:Function programming concepts include anonymous functions, different methods for calling functions, and meth

Oracle elegant for loop insert inloopinsert

Oracle elegant for loop insert inloopinsert Create table computers (comNo number (4) constraint PK_comp primary key, compModel varchar2 (64) constraint unique_comp unique, buyTime date, price number (12, 2) constraint ch_price check (price> 0 and price

Java Learning Summary: elegant strings

separation methods, learn ing ... toLowerCase: Returns a new string after converting all characters to lowercasetoUpperCase: Returns a new string after converting all characters to uppercaseTrim: Returns a new string after removing whitespace characters from both endsReplace: Returns a new substring that replaces all of the characters in the string with its matching characterReplacefirst: Returns a new substring that replaces the first one in the string with the substring after it matchesReplac

Elegant mobile development and client development

Elegant mobile development and client development For mobile development, in order to achieve the page HD effect, the specifications of visual drafts often follow the following two points: 1) Select the screen width and height of a mobile phone as the benchmark (for example, 375x667 of the iPhone 6 ). 2) for HD screens, in order to achieve high-definition effects, the canvas size of the visual draft will be twice that of the benchmark (for iPhone 6: T

In-depth discussion of the use of require_once in functions elegant configuration file definition method recommended _php Instance

[$level];}}Var_dump (Getnamebyleval (1));Var_dump (Getnamebyleval (2));In this case, regardless of using the Getnamebyleval function, the level.config.php configuration file should be included in, a little less cost-effective. 2. Include, apply in functionsCopy the Code code as follows:function Getnamebyleval ($level) {$level = Intval ($level);New code for global $g _levelconfig;//Require_once ' level.config.php ';if (!isset ($g _levelconfig[$level])) {return false;}else{return $g _levelconfig[$

Elegant Python-__get__ vs __getattr__ vs __getattribute__ and properties search strategy

MRO (Method Resolution order). If none of the above is found, then the Attributeerror exception is thrown.PS. can see from above, Dot (.) Operations are expensive, very many implicit calls, with particular emphasis on performance, and in high-frequency loops, the ability to consider binding to a temporary local variable.Here's a code snippet for everyone to do their own exploration.Class C (object): def __setattr__ (self, Name, value): print "__setattr__ called:", name, value

Elegant Python-A few lines of code to implement UNIX pipe-style function calls

Using Linux's basic knowledge of its pipeline is to use the output of a program or command as an input to a program or command.Less nonsense, let's look at how Python implements the UNIX pipeline style function call.#coding =utf-8class Pipe: def __init__ (Self, func): Self.func = func- def __ror__ (self, Other): return Self.func (Other) @Pipedef Add (args): return sum (args) @Pipedef incr (ARG): return arg + 1print [1, 2, 3] | add | incrThe principle is the adorner + op

Elegant Python-implements GLOB style pattern

of the walk does not pass, pull back the position of the *, greedy match.As for the expansion of square brackets, it is very clear that the include and exclude variables are made.The code below.#coding =utf-8def Build_expand (p): #方括号展开 ptr2include = {} Ptr2exclude = {} Ptr2next = {} len_p = Len (p) pptr = 0 while pptrExecution results are(' AA ', ' a ') False(' AA ', ' AA ') True(' AAA ', ' AA ') False(' AA ', ' * ') True(' AA ', ' A * ') True(' Ab ', '?* ') True(' AaB ', ' c*a*b ') False(' Ca

Use Kotlin to develop an elegant Android app

enter your account or password") } }. Lparams(Width = Dip ( -), height = Dip ( -) {TopMargin = Dip ( -)} linearlayout {orientation = horizontal Gravity = Gravity. CENTER_vertical CheckBox ("Remember Password") {TextColor = Color. Parsecolor("#666666") TextSize = -F leftpadding = Dip (5)} TextView ("Privacy Agreement") {TextColor = Color. Parsecolor("#1783e3") Gravity = Gravity. RightTextSize = -F}. Lparams(width = matchparent)}. Lparams(Width = Dip ( -) {TopMar

Less: Elegant writing of CSS code

, ..., Valuen) returns the largest of a series of values.Absnumber) calculates the absolute value of the digit, and keeps the unit sin (numbers)sine function as the cos (number) cosine function asin theinverse chord function. Returns the angle in radians , the interval isbetween-pi/2 to pi/2. ACOs (number) inverse cosine function. The interval is between 0 and pi. Tan (number) tangent function Atan (number) the inverse tangent function pi () returns the Pi (pi) isnumber (value) if the value to

JavaScript Elegant Simple stitching string

ObjectiveRecently maintained an old system, there is a large number of JS splicing string code, here a total of JS stitching stringJS Native string concatenationThe strings inside JavaScript can be spliced directly with +Return "The above is splicing a JS event with a tag, you can see the inside mixed with single quotation marks and double quotation marks, with relatively strenuous.Because the single and double quotation marks are combined together, you can use the JS array to separate operation

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