Programmer Think

1. Basic concepts Hierarchical System of categories Logs Where can the appenders log be printed, either as a file or as a terminal The layouts log output format, which defines an output mode similar to that in printf. There are three kinds, followed by examples, the three are: basic, simple, pattern. The level of priority log is EMERG, ...

Scene Restoration Sometimes in pages containing input boxes, clicking on input boxes will block part of the input boxes because the keyboard pops up, affecting the user experience. iOS does not deal with this problem by default, but we can achieve the effect of automatically uploading the keyboard pop-up input box by ourselves. Test Page Idea ...

Object Oriented and Prototype Understanding prototypes In JavaScript, inheritance can be achieved through prototypes.The concept of prototype is simple.Each object contains a reference to a prototype, and when looking for an attribute, if the object itself does not have that attribute, it looks for the attribute on the prototype. Each object ...

As mentioned in the last book, variables, operators, branching structures, loops and nested loops are included in JS. This time, Ben K will talk to you about BOM, DOM and events in JS. I. "Huaxin Big Radish" - BOM 1. Shocked, Why did FFF Group Lift a Torch on BOM--Brief Introduction to BOM BOM(Browser Object Model) refers to the brows ...

In PL/SQL programs, cursors are often used to handle transactions with multiple rows of records. Among them, cursors are divided into explicit cursors and implicit cursors. Here, the use of explicit cursors is emphasized. Explicit Cursor Processing of Display Cursor Four PL/SQL steps: 1) Define a cursor: Define a cursor name and the corr ...

Summary GPUImage is a well-known open source library for image processing, which allows you to use GPU accelerated filters and other special effects on pictures, videos, and cameras. Compared with the Core Image framework, you can use custom filters based on the interface provided by GPUImage. Project address: https://github.com/BradLarson/GPUI ...

Template syntax Text: <span>Message: {{ msg }}</span> v-once One-time interpolation, when the data changes, the contents of the interpolation will not be updated <span v-once>This will not change: {{MSG}}</span> v-html directive <p>Using mustaches: {{ rawHtml }}</p> <p>Using v-html direct ...

How many people want to develop a small program and find that their foundation is 0. Today, I would like to share with you an inspirational case: a girl who reads atmospheric science and teaches herself the front-end development, because she likes to browse and know, she has made a "imitation" small program. I hope her development e ...

The objc_property_t * class_copy PropertyList (Class cls, unsigned int * outCount) function is a function in runtime that copies a list of attributes of a class object and returns an array of values of type objc_property_t*. You can then traverse the array to extract each attribute value. Almost every dictionary-to-model framework needs this fu ...

Introduction to enum (enumeration) class The java enumeration class is a set of predefined constants declared using the enum keyword. The name of the constants is officially recommended in uppercase. 1. Basic usage of enum class A common example, such as a week, can be described as an enumeration class, as follows public enum Day { ...