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In-depth understanding of the scope and context of Javascript, and deep understanding of javascript Overview The implementation of scopes and context in Javascript is unique to the Javascript language. To some extent, Javascript is very flexible. Functions in Javascript can use various contexts, and the scopes can be encapsulated and saved. Thanks to these features, Javascript also provides many useful desi

Deep understanding of building and introducing Maven environments, and deep understanding of building maven Maven is a Java tool for project management. In JavaEE, we can use Maven to conveniently manage projects in team collaboration. Now we are learning the JavaEE framework and can use Maven to manage the library, it is effective and convenient for other personnel in the team. The project has been complet

Deep understanding of Java Virtual Machine-learning notes and deep understanding of Java Virtual Machine JVM Memory Model and partition JVM memory is divided: 1.Method Area: A thread-shared area that stores data such as class information, constants, static variables, and Code Compiled by the real-time compiler loaded by virtual machines. 2.Heap:The thread-shared area, the storage object instance, and the me

A deep understanding of the Python crawler proxy pool service and a deep understanding of python Crawlers The company built a stable proxy pool service for Distributed Deep Web crawlers to provide effective proxy services for thousands of crawlers, ensuring that all crawlers receive valid proxy IP addresses for their websites, so as to ensure the fast and stable operation of crawlers, of course, the work do

Understanding classes and instances in Python and understanding Python instances The most important concepts of object-oriented are Class and Instance. You must remember that classes are abstract templates, such as Student classes, instances are specific "objects" created based on classes. Each object has the same method, but its data may be different. Taking the Student class as an example, in Python, the

Deep understanding of Java Virtual Machine-Chapter 2: deep understanding of Java Virtual Machine Chapter 2 Java memory zone and memory overflow exceptions Running data area 1. The Program Counter (Program Counter Register) is a small memory space, which can be seen as the row number indicator of the bytecode executed by the current thread. 2. the Java Virtual Machine Stack (Stack) thread is private. A Stack

Deep understanding of Python3 built-in functions and deep understanding of python3 This article mainly introduces Python3 built-in functions and shares them with you as follows: Built-in functions The following code uses Python3.6.1 as an example: # Coding = UTF-8 # builtin_function.py built-in Function import osdef fun (): all ([True, False]) # all elements of the iterator (empty or) are true, returns tru

Deep understanding of Java Virtual Machine-Chapter 1, deep understanding of Java Virtual Machine Chapter 2 Virtual Machine bytecode execution engine 8.2 runtime stack frame structure Stack Frame is a data structure used to support virtual machines for method calling and method execution. Each stack frame includes a local variable table, an operand stack, a dynamic connection, a method return address, and s

Deep understanding of Java: basic concepts of Annotation and in-depth understanding of annotation What is Annotation ): Annotation (Annotation) is a way and method for Java to associate any information with any metadata (metadata) in elements of a metaprogram. Annotion (annotation) is an interface. The program can obtain the Annotion object of the specified program element through reflection, and then obtai

A deep understanding of the class loading mechanism of Java virtual machines and a deep understanding of virtual machines1. class loading time For the first phase of class loading-loading, the virtual machine has no mandatory constraints,For the initialization phase, Virtual machine mandatory provisionYes and onlyIn the following 5 cases, initialization must begin. Of course, the loading, verification, and

Correct understanding of I = I ++, and correct understanding of I I = I ++ has been frequently encountered in the recent written examination. This problem is still relatively simple, but it doesn't matter if I + = I ++ doesn't matter, I saw a big problem. Common sense 1. result + = expression is equivalent to result = result + expression in all languages. 2. int I = B ++; how is this done? First, the system

[Python] -- first understanding python, first understanding pythonPython InstallationWindows: 1. Download the installation package https://www.python.org/downloads/2?install the default installation path: C: \ python273. Configure the environment variable [Right-click the computer] -- "[attribute] --" [advanced system settings] -- "[advanced] --" [environment variable] -- "[in the second content find a line

In-depth understanding of ini configuration in php (2), in-depth understanding of ini Continue with the previous article.1. Change the configuration during running As mentioned in the previous article, the ini_set function can dynamically modify some php configurations during php Execution. Note that not all configurations can be modified dynamically. For information on the modifiable ini configuration, see

In-depth understanding of php json arrays and objects, and in-depth understanding of json In the process of PHP backend and client data interaction, the JSON data is sometimes formatted in an irregular manner. The JSON data is an array and the JSON data is an object, which makes the client developers feel like they want to crash. Therefore, the frontend and backend personnel must first understand the json_e

A deep understanding of JAVA's static (combined with the C language) and a deep understanding of static 1 public class statictest {2 3 4 String X = "I am a non-static variable"; 5 6 7 static int butterfly = 0; 8 static String staticX = "I Am a static variable "; 9 static String staticZ = "I am also a static variable"; 10 11 12 statictest () {13 System. out. println ("I am constructor"); 14} 15 16 17 18 publ

A deep understanding of the usage of the Python modifier and a deep understanding of python Because functions or classes are all objects, they can also be passed everywhere. They are mutable objects and can be changed. Decorator is the act of changing a function or class object after it is created but bound to a name ). There are two meanings hidden after the "decorator": one is that the function plays a de

A deep understanding of magic methods in Python and a deep understanding of python I have been in touch with Python for a while, and I have been in touch with many Python-related frameworks and modules. I hope to share with you the Design and Implementation I have come into contact, so I took a small "Charming Python" label and gave myself a start. I hope you will criticize and correct me a lot. :) From fla

A preliminary understanding of linq to xml and a preliminary understanding of linqtoxml I recently learned about lint to xml and wrote a blog here, so that I can view it later ~~ 1. Frequently Used classesXmlDocument -- document (xml file) XmlElement -- Element (node) XmlAttribute -- attribute (node content) XNamespace -- namespace (xmlns) XDeclaration -- "1.0", "UTF-8" is generated by default when an XML f

In-depth understanding of the method with parameters ----- object as a parameter, in-depth understanding ----- After learning about the common parameter-based method, we will go into the perspective of the parameter-based method. In the array as the parameter method, we know that we can add the scores of multiple students to the array and print them out, How can we achieve this if we need to add not only th

Understanding IL code (2) and understanding il code The most basic IL Code mentioned in the previous article should be relatively easy to understand. Therefore, with the foundation of the previous article, this article will be explained in depth. First, I must introduce some important concepts: Evaluation Stack: This is caused. net clr automatically manages the memory during execution. Every thread has its