Deep understanding of JavaScript scope and scope chain

1, Scope(1) What is the scope Before understanding the scope, first look at the variables and functions. Variables and functions have certain access rights, that is, they must meet the conditions or be within a certain range, which is the scope. Its concrete manifestation is a specific code, in which the variables and functions are closed and ...

Posted on Sun, 09 Feb 2020 22:16:47 -0800 by morris520

Take and return json data in flask

json data structure: take the city data of package ticket website as an example, don't panic to get the data, 1. Analyze the data structure first. There are several large fields ('returnCode' and 'returnValue' fields. Only one field is defined and the other field is reserved (no need to deal with) 2 key table - > split 're ...

Posted on Sun, 09 Feb 2020 09:05:50 -0800 by netzverwalter

Jump between servlets

Back to home This is just a simple understanding, because now the mainstream development mode can hardly use the Servlet, or it only comes with the framework, so it's packaged. Servlet s can jump to each other, so that multiple servlets can be used for modularization. Servlet jump is used in MVC (model ...

Posted on Sun, 09 Feb 2020 07:20:20 -0800 by pets2soul

Spring annotation version -- automatic scanning and filtering rules

During the development of spring annotation version, we usually establish a Configuration class of our own. The so-called Configuration class is to add @ Configuration annotation on the class. If the default filter rule is used, mark @ Controller,@Service,@Repository,@Component on the class, The Spring ...

Posted on Sun, 09 Feb 2020 02:31:33 -0800 by redmonkey

Basic practice of UIDynamtics

Preface This article introduces various usages of UIDynamtics. From the basic UIGravityBehavior and UICollisionBehavior, these simple animation behaviors bring excellent visual experience. Later, it will introduce UISnapBehavior, UIPushBehavior and cool UIAttachmentBehavior to see how to use simple c ...

Posted on Fri, 07 Feb 2020 23:46:38 -0800 by The Silent

Summary of knowledge points of css

Preface css is not only the makeup artist of the page, but also the foundation that every front-end must master. In the work, it is often too frequent for business, so it can't be very good to precipitate the technology. This paper is mainly the notes that the author learned from his spare time. It ma ...

Posted on Fri, 07 Feb 2020 01:24:07 -0800 by nawhaley2265

How to obtain the attribute information of data changes in C ා - class

I. Preface In normal development, when the user modifies the data, there is no good way to record the specific modified information. We can only temporarily use the method of serializing the class into a json string and then inserting it into the log. At this time, if we want to know which field values the user has changed, it is very difficult ...

Posted on Thu, 06 Feb 2020 23:54:52 -0800 by jprazen

DOM basic + domReady + element node type judgment

DOM node type Element 1 node.element node attr 2 node.attribute node Text 3 node. Text > node text node (the blank area between labels also belongs to the text node) Comment 8 node.comment node Document 9 node.document [node] document node (on all documents, i.e. the front most position in a page, in front of the document definition) documen ...

Posted on Thu, 06 Feb 2020 02:42:28 -0800 by damo87

[zero basic QT] [048] Qml and C + + call each other

In order to save code and focus on technology itself, we directly reuse main.qml from the previous blog to demonstrate Qml code //main.qml import QtQuick 2.13 import QtQuick.Window 2.13 //Window node Window { id: root visible: true width: 640 height: 480 title: "Qt Qui ...

Posted on Wed, 05 Feb 2020 05:32:37 -0800 by future448

Hibernate multi table design

Multi table design In the development process, the requirement analysis is carried out in the early stage. The requirement analysis provides E-R diagram, and the table structure is compiled according to the ER diagram. There are three relationships between tables: one to many, many to many, and o ...

Posted on Tue, 04 Feb 2020 03:33:57 -0800 by dannyz