Fooddelivered robot - drive code of feeding robot module - key part of IO acquisition part

I. selection of key module: Film button 8P DuPont head, with a spacing of 2.54mm, can be inserted on the row pin to connect the circuit; the mortar color sticker on the back of the keyboard can be removed and firmly pasted on the surface of the chassis. It is suitable for the external expansion ...

Posted on Tue, 15 Oct 2019 11:23:26 -0700 by donald

Source Code Analysis Elastic Job Failure Transfer Mechanism

This section explores Elastic Job failover mechanisms. We know that Elastic Job is a distributed task scheduling framework based on Quartz, where the distribution is the distribution of data. Elastic Job's core design concept is that a task is executed on multiple nodes, each node processes a part of the data (task to be processed data fragment ...

Posted on Wed, 09 Oct 2019 20:50:02 -0700 by vomitbomb

Android -- Switching between Fragment s

Implementing Super Simple 4 Bottom Bar Switching Fragment Design sketch:                                                         Implementation steps: Step 1: Dependent packages implementation 'com.android.support:design:28.0.0' Step 2: Create menu directory under res directory and navigation.x ...

Posted on Wed, 09 Oct 2019 04:29:47 -0700 by ayj

react advanced features

After using react for so long, I didn't know that react had so many advanced features. I had nothing to do during the vacation. I tried some advanced features of react. Here is the trial record. overview Characteristic characterization Usage scenarios Code segmentation Provide asynchronous components for unpacking Use when you need to opti ...

Posted on Sun, 06 Oct 2019 02:53:17 -0700 by PURU

React Hook parent component retrieves data/functions of child components

We know that in react, props are often used to transfer child component data to parent component, but the function of parent component calling child component is not often used. Documentation says ref is not the best choice, but thinking of laziness and not learning redux, I found many tutorials on the Internet. Either the hook talks too little ...

Posted on Sat, 05 Oct 2019 23:46:06 -0700 by tjodolv

Meaning of HTTP status code 429

Today, I wrote a simple nodejs application, using module request to initiate several asynchronous requests to the jianshu website at the same time, and to request a list of all my articles from the brief book by paging. var request = require('request'); var jsdom = require("jsdom"); var JSDOM = jsdom.JS ...

Posted on Tue, 01 Oct 2019 22:24:36 -0700 by bobbyM

Using await and async keywords to develop nodejs application to fetch the title and hyperlink of the article of the brief book website in batches

ES6 await and async have been out for so long, let's learn together. Or use my previous example of reading a list of all articles by a simple book user. First look at the main function framework: async function downloadArticle(pageNumber){ var url = PAGE + pageNumber; console.log("current page: " + ...

Posted on Mon, 30 Sep 2019 13:41:19 -0700 by Mark Nordstrom

10 minutes to learn react basics quickly

Blog Text 9102, if you don't know react yet, I hope this article can help you quickly understand the basics of react.js. Create Project Use create-react-app Tools quickly create React SPA s. # Create Project yarn create react-app my-app cd my-app # Run program in development mode yarn start Initial project structure: my-app/ README.md no ...

Posted on Sun, 22 Sep 2019 09:12:04 -0700 by tekken00

Android Jetpack -- Navigation

Navigation is a Fragment that allows users to browse, enter and exit different content in an application. Navigation enables you to move from simple button clicks to more complex modes, such as application bars and navigation drawers. Navigation comp ...

Posted on Sat, 14 Sep 2019 05:41:24 -0700 by spenceddd

Deep Understanding of Spark 2.1 Core: TimSort Principle and Source Code Analysis

In the blog Deep Understanding of Spark 2.1 Core (X): Principles and Source Code Analysis of Shuffle Map End We mentioned that: Sort and others are used to sort the data, and TimSort is used. In this blog post, let's take a deeper look at Tim S ...

Posted on Fri, 06 Sep 2019 23:04:59 -0700 by HokieTracks