Tag：Overall situation
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Time：2021-7-30
Recently, I was learning python programming language, but I encountered a small problem. The original Ruby coding specification is indented with two spaces, so it was previously set in the global user configuration of sublime”tab_size”: 2Therefore, when editing Python files, you have to set it from the menu every timetab_sizeThe size of the is 4. […]
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Time：2021-7-28
abstract: how to overcome the problem of distributed transaction under microservice architecture? What is micro service? What are the advantages and difficulties of microservices? What is a microservice architecture? In short, the microservice architecture system is a distributed system, which is divided into independent service units according to business, which not only solves the shortcomings […]
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Time：2021-7-26
Introduction When I came across the situation of debugging NPM local package again, I couldn’t remember for a moment. I looked at the document, actually operated it, and found something that was not written in the document. Origin My GitHub introduce According to the documentation, the package link is divided into two steps. First step […]
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Time：2021-7-24
Laravel Valet, the minimalist laravel development environment on the Mac platform, has already released version 2.0, which mainly includes some bug fixes and replacing the built-in server from caddy to nginx. Upgrade to Valet 2.0 Upgrading to the new version is simple and can be completed in just a few steps. First, back up your […]
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Time：2021-7-23
background Continuation of the previous two articles: Try vue3.0 – from todolist (1) Tasting vue3.0 – understanding changes (2) The third part is fresh, mainly about the difference between the use of vite recommended by the official website and the previous one, as well as the use of typescript, a dialog component like element UI, […]
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Time：2021-7-14
When using parcel, many people encounter a problem async function bundle(main, command) { ^^^^^^^^ SyntaxError: Unexpected token function For this error, many people seem to have known each other before. They think it’s a Babel configuration problem. However, since parcel is known as zero configuration, there is no need to configure Babel. If you use […]
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Time：2021-7-14
catalogue– Scaffolding Global command interactive input Pull remote warehouse code optimization summary 1. Scaffolding Today, the bricks on the construction site were a little hot. I looked up at the sky, thought for half a minute, and decided to build a scaffold for the convenience of moving bricks in the future Sorry, it’s the wrong […]
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Time：2021-7-13
preface From CPU to memory, to disk, to operating system, to network, there are unreliable factors in computer system. Engineers and scientists try to use various software and hardware methods to fight against this unreliable factor and ensure that data and instructions are processed correctly. In the field of network, there are TCP reliable transmission […]
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Time：2021-7-13
preparation in advance 1. Introduction to node.jsIn short, node.js is JavaScript running on the server side. Node.js is a JavaScript running environment based on chrome V8 engine. Node.js uses an event driven, non blocking I / O model to make it lightweight and efficient. Node.js package manager NPM is the largest open source library ecosystem […]
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Time：2021-7-12
Link to the original text:http://tecdat.cn/?p=22853 This paper introduces different solvers in r that can be used for portfolio optimization. Universal solver The general solver can deal with any nonlinear optimization problem, but the cost may be slow convergence. defaultpackage The package stats (basic R package installed by default) provides several general optimizations. optimize()。 For one-dimensional […]
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Time：2021-7-12
1. Introduction of eventbus Eventbus, also known as event bus, can be used as a communication bridge in Vue. It is an event center shared by all components. It can register with the center to send or receive events. Therefore, components can notify other components in parallel 2. How to use eventbus (1) Initialization First, […]
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Time：2021-7-5
Issue Description In the sea at mode, if the table structure is changed (fields are added), NullPointerException will be reported when inserting (in the case of global transaction). The error is as follows ReasonThe table structure in Seata will be cached for a period of time, but the cache is not invalid after the table […]
