Programmer Think

JQuery introduction JQuery is a fast and concise JavaScript framework, which is another excellent JavaScript code base (or JavaScript framework) after Prototype. The purpose of jQuery design is "write Less, Do More", that is to advocate writing less code and doing more. It encapsulates common JavaScript function code ...

Topic: there is a student table, which records the courses and scores of all students in a class. Each student has multiple courses. Different students may take different courses. Try to write an SQL statement to find out the names of all students whose course scores are greater than 80.Table structure and data are as follows: - ...

Emum (enumeration) Enumeration is a basic data type in C. It can make data more concise and readable. Enumeration grammar is defined in the following format: enum enumeration name {enumeration element 1, enumeration element 2,...}; For example, if there are 7 days in a week, instead of enumeration, we need to use #define to define an alias for ...

This is an encapsulated vue component, which simply sets the export header, content, and bottom The content can be paged. It can export all pages of the list The implementation is based on html2canvas to convert the page to image, and then use jspdf to add the generated image directly to pdf html2canvas configuration reference address JSPDFS G ...

I. overview This paper is based on JDK8 The underlying LinkedList is realized by the data structure of two-way collection Memory does not need continuous space guarantee Element search can only be sequential traversal search Better performance for add and delete operations LinkedList can be used as List, queue and stack. It supports adding an ...

Is there any problem using async / await in the forEach loop?I'm trying to traverse the file array and await the contents of each file. import fs from 'fs-promise' async function printFiles () { const files = await getFilePaths() // Assume this works fine files.forEach(async (file) => { const contents = await fs.readFile(file, ' ...

This issue introduces how Canvas draws pictures, including how to draw high-definition pictures, use network pictures / local pictures, date conversion (lunar and solar calendar / week conversion), picture adaptation mobile phone model, etc. Layout introduction There are four parts here. The picture above shows the QR Co ...

Polymorphism is one of the basic principles of object-oriented software.The term often refers to things that can take many forms.In an object-oriented approach, polymorphism makes it possible to write programs with late-bound references.Although it is easy to create polymorphic references in Java, the concepts behind them have a far-reaching im ...

1. overview github address: https://github.com/luoshenzhi/AutoPlayViewPager I didn't want to build the wheel again, but I didn't feel satisfied after trying several, so I had to do it myself 1.1 characteristics The code is less intrusive. Just change the class name without changing the adapter Draw indicators by code, n ...

Download and install node npm Get into node Select Windows installation package (. MSI) 64bit to download and install Using msi will configure the environment variable path, which is convenient All commands are basically in the project path or directly in the terminal of idea //Open the command prompt to test whether the instal ...