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Detailed description of the use of condition judgment statements in JavaScript, and detailed description of the use of javascript When writing a program, you may need to use a path to specify two paths. Therefore, conditional statements must be used to allow the program to make correct decisions and execute correct actions. JavaScript supports executing conditional statements based on different conditions.

Detailed description of Yii2 rules verification rules, detailed description of yii2rules Verification Constraints defined by the yii2 framework public $builtInValidators = [ 'boolean' => 'yii\validators\BooleanValidator', 'captcha' => 'yii\captcha\CaptchaValidator', 'compare' => 'yii\validators\CompareValidator', 'date' => 'yii\validators\DateValidator', 'default' => 'yii\validators\DefaultVa

Detailed description of Statistical Data functions implemented by PHP, and detailed description of php statistical data This example describes the statistical data function implemented by PHP. We will share this with you for your reference. The details are as follows: Statistics are the integration of basic data. SQL is used, including the group by function, count function, and order by function. SQL will c

Detailed description of Python Implementation of the function of pressing any key to continue/exit, detailed description of python Preface To implement this function, you need to pause the program, wait and capture a user's keyboard input, and then continue to execute. Python has a built-in library to help us implement this function, but we need to treat Windows and Linux differently. msvcrt Ingetch() This

Detailed description of Python3 simple and easy-to-understand Mongodb tutorial, detailed description of python3mongodb Connect to database To connect to a database, you must provide an address and interface. First, import the package. from pymongo import MongoClientconn = MongoClient('localhost',27017) Of course, you can write as follows: conn = MongoClient('mongodb://localhost:27017/') Create a database Mo

ThinkPHP built-in function description D, F, S, C, L, A, I, thinkphp Function Description Single letter functions D, F, S, C, L, A, and I are all defined in ThinkPHP/Mode/Api/functions. php. The following describes their functions: D () load Model class M () load Model class A () load Action class L () Obtain language Definitions C () Get configuration value usage is C ("the subscript entered in the array i

Detailed description of random graphic verification codes generated by python, and detailed description of python verification Codes Use the pillow module to generate a random image verification code using python. 1. Install the pillow Module pip install pillow 2. Basic use of the pillow Module 1. Create an image From PIL import Image # defines the use of the Image class to instantiate an Image of a length

A brief description of Solr master-slave cluster configuration and a brief description of solr master-slave Cluster Solr clusters are mainly divided into master-slave and SolrCloud clusters. It is applicable to read-dominated scenarios. SolrCloud is suitable for scenarios with large data volumes and updates from time to time. Therefore, the master-slave configuration of solr is very simple. Find 　　 Mast

A complete WSDL document and detailed description of each label, detailed description of the wsdl document Http://www.57market.com.cn/HelloService"Xmlns: soapenc12 ="Http://www.w3.org/2003/05/soapencoding"Xmlns: tns ="Http://www.57market.com.cn/HelloService"Xmlns: wsdl ="Http://schemas.xmlsoap.org/wsdl/"Xmlns: xsd ="Http://www.w3.org/2001/XMLSchema"Xmlns: soap11 ="Http://schemas.xmlsoap.org/soap/envelope/"

Detailed description of the code block and parameter transfer in Ruby, detailed description of ruby code transfer 1. Block DeclarationAfter the function is called, the block declaration is enclosed by {...}, Or do. end encapsulation. {} Is generally used in single-line statements, and do... end is used in multi-line statements. (1 .. 4). each {| v | print "# {v}"} # output 1 2 3 4 Blocks can contain paramet

Detailed description of paging optimization instances in MySQL, and detailed description of mysql paging instances Generally, order by limit start and offset are used for paging query. For example, the following SQL statement: SELECT * FROM `t1` WHERE ftype=1 ORDER BY id DESC LIMIT 100, 10; Or the following paging SQL statement without any conditions: SELECT * FROM `t1` ORDER BY id DESC LIMIT 100, 10; In ge

Detailed description of the factory mode of the PHP design mode, and detailed description of the php design mode When developing large systems, the following situations often occur: I have A part of the basic data. The class classA is read from database A, and many other functions are operated based on this basic data. Now, I want to change the data from database A to another data source. At this time, it i

Detailed description of automatic loading of PHP files, detailed description of autoloading Traditionally, in PHP, when we need to use a class file, we have to perform the following in the Document Header: require or include: However, once there are too many documents to be called, you have to write a line each time, which is not beautiful. Is there any way to make PHP documents automatically loaded? Yes,

Detailed description of object generation methods for PHP object-oriented programming, and detailed description of python Object-Oriented Programming This article describes the object Generation Method of PHP object-oriented programming. We will share this with you for your reference. The details are as follows: Object Let's look at an example. Let's look at a more flexible case Singleton Comment: you ca

Detailed description of Vue event driver and dependency tracking, detailed description of vue event tracking A previous analysis on Vue data binding principles needs to be reviewed recently and sent to the essay by the way. In the previous implementation of an Mvvmsetter To observemodel.viewModel Bindmodel . WhenmodelChange, update allviewModelTo render the new value to the interface. At the same time, thro

Detailed description and examples of JavaScript function modes, and detailed description of javascript The function of the JavaScript design pattern is to improve code reusability and readability, so that the code can be easily maintained and extended. In javascript, a function is a type of object, which means that it can be passed to other functions as a parameter. In addition, a function can also provide

Detailed description of javascript traversal methods, detailed description of javascript For the convenience of examples, the existing arrays and json objects are as follows: var demoArr = ['Javascript', 'Gulp', 'CSS3', 'Grunt', 'jQuery', 'angular'];var demoObj = { aaa: 'Javascript', bbb: 'Gulp', ccc: 'CSS3', ddd: 'Grunt', eee: 'jQuery', fff: 'angular'}; For You can directly look at the example. It's easy t

Detailed description of VueJs asynchronous dynamic loading blocks, detailed description of vuejs asynchronous First, define the component as asynchronous loading. define(['jquery','vue'],function($,Vue){ Vue.component('comp1',function(resolve){ require(['component/comp1'],resolve); }); Vue.component('comp2',function(resolve){ require(['component/comp2'],resolve); }); var b = new Vue({

Detailed description of extended instances of new features in ES6, and detailed description of new feature instances in es6 This article describes the function extension of the new features of ES6. We will share this with you for your reference. The details are as follows: I. Default function parameters 1. ES6 allows you to set default values for function parameters, that is, they are directly written after

Vue parent component click to trigger sub-component event instance description, vue instance description I recently learned about the communication between Vue parent and child components. I just encountered an event dispatching and receiving between parent and child. Here I will record it. Here I am using ref Register the reference information for the sub-component.Official WebsiteYes. Ref is used to regis