CORS and cookies on the front end is a very important problem, but most of the time in development, because the domain of the front and back end is often the same, so rarely to care for these problems. Or just ask the backend to be Access-Control-Allow-Origin...
I looked at the popular sql packages now and found that almost none of the functions can be used to jump an error when connection is lost in real time. For example: nodejs mysql which, we can use connection.on ('error') to listen for errors. But in golang...
Because there are too many specific words，It's too tiring to check it every time I see it every time，But also have to have context switch...
We often need to switch between different environments when developing a project, so we often set different environment variables. However, if you write directly to the program every time it is too cumbersome, if you can pass in the environment variables dynamically, you can reduce a lot of unnecessary changes, and the program is relatively clean. Flag can generally be used in golang flag this package...
Vue was developed in recent projects, and vuex is often used as the Single Truth of Source store to manage more complex streaming states. When building store inside vue，Are all the modules are written，Then unified into the vue root...
In golang there are two reserved words make and new, but also the beginning of learning golang easy to confuse place, here to make a simple note. new new can be used to initialize the generic and return the storage address. So we usually use pointer variables to pick up new types. In particular, it should be noted that new will automatically use zeroed value...
The Birthday Paradox is when you first started statistics, and the teacher liked the moves used to bluff students. Usually the teacher will Xu Xu take 100 yuan from the wallet, and ask the student, are there two people in the classroom on the same birthday? Intuitively, we may think that the odds are low. But in fact, as long as more than 23 people, 2 people on the same day there are 5...
Hello everyone, Happy New Year 2018 🎉. Yesterday and his girlfriend chose a very ordinary New Year's Eve，Do each other's things in the morning，Evening party dinner at home，Run together，Finally while writing programs while watching red and white，End of 2018
As a front-end engineer, the team is usually the person who sends pull requests the most often. In order to make your PR easier to test, and to make it easier to review the reviewer, a few considerations have been summarized. The pull request describes the purpose of this pull request. For example: fix layout...
Array.sort analysis This article is not talking about things to note in Javascript's native sort. For example, the default sort method will convert the value to String and sort according to the char code, so the above result will appear. Today we're going to explore the implementation behind Javascript sort
In the database, in order to improve query efficiency, the database can speed up query efficiency by creating indexes when the data is large. This article discusses the index of PostgreSQL. In most cases, using the syntax of `CREATE INDEX` directly can handle common development scenarios, there are many different types of index types available in PostgreSQL.
Recognize the fact that table is not used as a brilliant visual, recently there is a need to use tables frequently in the background, how to design a good table for users is a challenge, especially in the case of a large number of data pens and many fields, users are easily attracted to additional elements. Actually for rendering data on, table...
1111 this year, in addition to major e-commerce is double 11 special, today is also my 23rd birthday
Medium does not support code block editing itself, although I don't know the reason behind it (perhaps the engineer is not the main customer), so if you want to highlight the code, one way is to paste the image directly, paste it on the gist and then embed it
Better-Express-Error When developing express, if an error is encountered, it is usually printed directly on the error page, or directly directed to a 404, 500 page in the production side. Although there is nothing worth mentioning, but really, see this kind of page, will you feel happy? default error...
react finally released v16，In fact, the introduction of the official blog is quite complete (and pleasing to the eye)。 This article serves as notes and consolidation, streamlining some of the details. ComponentDidPatch (error, info) react16's brightest part, adding errorBoundary functionality to ensure that the life cycle...
Finally, time to organize the recent interview process. Summarize some of the things that we see: Usually, company interviews only test Javascript familiarity, mostly about algorithms or interpreting prototype chains, etc., rarely examines DOM or Event operations. Almost without CSS, even if there is simply a basic question such as class and ID priority. No interview exam HTML...
ramda is a very useful library. If you have heard of lodash or underscore, you can think of ramda as functional programming lodash. Their API has many similarities, except that ramda has FP functions, any API...
In machine learning, if there are too many features, it can cause problems, such as overfitting...
I have been learning Japanese for more than three years, and did a weekly magazine called Japanese 800 houses. Fan Page Medium...