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catalogue 1, awk 1. General 2. Working principle: 3.awk built in variables 4. Other built-in variables 2, Examples awk operation: Fuzzy matching: Comparison between numeric value and string: Logical operation & & and |: 3, Advanced usage of awk 1. Define reference variables 2. Conditional statements 4, Other examples ...

Component: a reusable Vue instance with a name and accepts the same option objects, such as data, computed, watch, methods, and life cycle hooks. The only exception is options specific to root instances like el. Function: components can be reused any number of times. Each component maintains itself independently. Because every time a compone ...

summary In typical OOP languages (such as java), the concept of class exists. Class is the template of object, but the concept of class was not introduced into JS before ES6 (ECMAscript6.0 released in 2015) Before that, objects were not created based on classes, but used a special function called constructor to define objects and their cha ...

1. Basic questions Given a list of numbers, print all odd numbers in the list scores = [45, 60, 89, 30, 12, 59, 99, 80, 71, 66, 1000] for i in scores: if i % 2 != 0: print(i) Given a list of numbers, print all the numbers in the list that can be divided by 3 but cannot be divided by 2 scores = [45, 60, 89, 30, 12, 59, 99, 80, 7 ...

In version 17.0.1, React has modified the life cycle of components. The new life cycle and the old life cycle have not changed much. The new life cycle has added two new hook functions, and three hook functions are outdated.   1, Old life cycle The life cycle of components can be divided into three stages: initialization stage, update st ...

Learn from https://labuladong.gitee.io/algo/2/19/36/ 1, DFS implements topology sorting Immediately above: why do you need to reverse the result of post order traversal to get the result of topological sorting? Take the above binary tree as a directed graph and point from the root node to the left and right child nodes. Then, the root nod ...

First sight The attachment is an apk. Run it in the simulator first. The simulator with ARM CPU must be selected, because the native library in the app only provides the version of arm instruction set, not x86 instruction set: After the simulator starts, drag apk to the simulator for installation. After installation, the icon of app in the ...

Once I received such a demand: to display the length of a character's voice on the interface and count down when playing. When I saw this demand at that time, I thought I would directly call the function provided by the official to obtain the event length, but when I did it, I found that I was naive. In the function interface provided by t ...

Vue3 quick start (I) Personal blog: Vue3 quick start (I) After the internship and entering the company, after simply installing vscode, node, git and other necessary tools, the tutor directly asked if he had studied vue3. After saying that he had only studied vue2, he shared two articles with me and asked me to check the documents to quickly ...

It seems that this log module can't be downloaded in the mirror station of Tsinghua University. Other mirror stations haven't tried it. I downloaded it directly from the address of the official website[read the full text]C:\Users\Administrator>pip install nb_log Collecting nb_log Downloading nb_log-7.2.tar.gz (71 kB) |████████████████ ...