MQTT is one of the four data connection methods supported by the ThingJS platform. MQTT is also known as Message Queuing Telemetry Transport. It is a message protocol based on Publish or Subscribe paradigm under ISO standard (ISO/IEC PRF 20922), which can be regarded as a "bridge of data transmission". MQTT is a lightweight protocol. The center of the MQTT protocol is the broker (server/broker).

In actual development requirement, we may not be able to is to use a single page development framework (for example vue, the react), these requirements are mainly based on the perspective of SEO (of course you can use the service side rendering solution, here we do not consider), then we need the front end of the traditional mode of development, the traditional mode will have CSS compatibility and compression, Base64 reduces HTTP requests, common code introduction, JS modularization and other basic issues. About WePack Multi-page typing...

The cost of development and construction is more than ten times more expensive to make an APP than to make an H5 website with the same function. Due to the need to develop dual systems of Apple and Android, that is, to develop two clients, the cost is doubled on the original basis.

I often use Ubuntu, so I chose this operating system. Considering the performance of Raspberry Pi, I chose Ubuntu Server intelligently. Based on previous experience, it is recommended to download the software from the official website to avoid all kinds of weird problems.

Any application that can be written in JavaScript will be written in JavaScript. -- Atwood's Law Anything that can be done with CSS will be done with CSS. The author's law depends on students' own habits of use. However, with good CSS, you can still improve a lot of development efficiency, at least to replace many JavaScript scenarios, reduce JavaScript code. JavaScript mentioned several...

Background passed is a list of data, the list of data sort may be disorderly, root parent set ID is 0, but it is possible to randomly delete one of them, resulting in this data parent set ID can not be traced back to 0, temporarily so write, there may be a better method!

Implement effect parent component call: {code... } recursive component {code... }

Study time varies from person to person. If you are in school, it is recommended that you study politics for an hour a day. Because you have other classes, and You have English to learn. The examinee suggestion that takes an examination of grind to review to whole day is maintained to go in 1 to 2 hours, it is important to ensure the efficiency of study and correct method.

SegmentFault is a leading developer technology community in China. We take technical questions and answers, technical column, technical courses, technical information as the core product form, for developers to provide a pure, high quality technology exchange platform.

JSXGraph is a cross-browser JavaScript library for interactive geometry, function drawing, tabulating, and data visualization in a Web browser. This tutorial covers the basics, how to build simple charts, and some advanced topics such as how to use JSXGraph in Moodle. To build JSXGraph, you don't need to be a programmer (although this helps), more accurate...