gw basic

!ECMAScript is just the basic grammatical structure used to standardize JavaScript, and the standards related to the deployment environment are defined by other standards, such as the DOM standard set by the world-Class!ECMAScript's release:December 2009, ECMAScript 5.0 released;June 2011, ECMAScript 5.1 released;June 2015, ECMAScript 6 was released and renamed "ECMAScript 2015"For more on JavaScript history, refer to Ruan Yi Feng TutorialRelated even

Because the discovery of the basic tutorial I recommended before the site has been very perfect, do not repeat the writing, so Ben Wang Lai to do exercises together.First, the principle of encryptionI remember when I learned C + + when I learned the input and output stream, when Mr. Wang taught us to write a small encryption program, so this time since the study of Python This small exercise of course not let go (in fact, this encryption program I use

provides additional functionality by using the referenced assembly. Ultimately, all frameworks use the. NET Framework 3.5 command line Visual Basic compiler (vbc.exe). This article discusses the 3.5 and 4 compilers, the compilers that are included in the. NET Framework 3.5 and 4, respectively. The 3.5 compilers are versions that are provided with Visual Studio 2008 and Visual Basic 9, and the 4 compilers

SELinux permission configuration is in the anroid/device/qcom/sepolicy/The SELinux permission configuration of MTK is in Android/device/mediatek/common/sepolicy Android 6.0The SELinux permission configuration of the system is in the anroid/external/sepolicy/directoryQualcomm's SELinux permission configuration is in the anroid/device/qcom/sepolicy/directory, if there are many versions of the generic version of the common directory to add.The SELinux permission configuration of MTK is in Android/

Object-oriented three basic characteristics and five basic principles (1) Three basic characteristics: encapsulation, inheritance, polymorphism Encapsulation:Refers to the abstraction of objective things into classes, and each class protects its own data and methods. A class can put its own data and methods only to allow trusted classes or objects to operate

db.dept.distinct("dname") Sort//按dname降序排列 db.dept.find().sort({"dname":-1}) //按dname升序排列 db.dept.find().sort({"dname":1}) Page out//获取前5条记录 db.dept.find().limit(5) //跳过5条再取5条(取6-10) db.dept.find().skip(5).limit(5) Indexdb.dept.ensureIndex({"dname":1}) db.dept.dropIndexes() db.dept.find({"dname":"java99999"}).explain("executionStats") Java access MongoDB based on Mongo-java package basic accessAPI Introduction - Mongo

Label:Summary of MySQL Basics primer about the database: database is a software developer to master the basic tools, the process of software operation is the process of manipulating data, the data in the database is nothing more than a few operations: increase-delete-check-change. after the MySQL installation is complete, you need to configure the variable environment, locate the configuration path, and then import the MySQL installation directo

Java equal and =, pay special attention to the comparison between the basic type and the basic type of the packaging type, javaequalThe difference between the equals method and "=" in java:The equals method is a java. lang. Object Class method.There are two usage instructions:(1) For string variables, the comparison method is different when "=" and "equals ()" are used to compare strings."=" Compares the va

My essays are all from my own handwriting, and the content is summarized after practice. Welcome to reprint, reprint please indicate the source: http://www.cnblogs.com/volcanol [Windows powershell] Powershell _ basic self-study course _ 1 _ first knowledge of powershell Powershell _ basic course _ 2_powershell and CMD and Unix/Linux Shell Powershell _ basic

419013871. Basic Concepts:　　(1) 10 percent cross-validation: The English name is 10-fold cross-validation, which is used to test the accuracy of the algorithm. is a common test method. Divide the data set into 10 parts. In turn, 9 of these were used as training data and 1 as test data for testing. Each test will be given a corresponding accuracy (or error rate). The average value of the correct rate (or error ratio) of 10 times results is an estimate

First understanding of PHP (1) Basic syntax, first understanding of php basic syntax. I first got to know the basic syntax of PHP (I). I first got to know the basic syntax of php and was always ready to learn PHP. as a result, there was always a problem some time ago, which was delayed for a while. Catch up now! This s

Summary of basic Python tutorials (1) and summary of basic python tutorialsIntroduction: I have always heard that Python is very powerful. I used to browse some blogs and found that it is a bit like Matlab used in mathematical modeling, so I didn't know much about it. Today, Python is used more and more places, and recently it is learning machine learning. Therefore, I want to learn it systematically, so I

Python Topic 1: Basic knowledge of functions and basic knowledge of python I recently started to learn the Python language, but I have discovered many advantages (such as concise language and deep understanding of web crawlers ). I learned through "Python basic tutorial" and "python video of zhipu education at 51CTO College". When I watched the video, the teacher