1. Differences in fabric chain code versions Fabric chaincode is divided into two major versions, version 1.x and version 2.x. The main differences between the two are: ####1. Differences in imported packages The packages imported by 1.x are: “[github.com/hyperledger/fabric/core/chaincode/shim](http://github.com/hyperledger/fabric/core/chaincode/shim)” pb “[github.com/hyperledger/fabric/protos/peer](http://github.com/hyperledger/fabric/protos/peer)” The packages imported by 2.0 are: “[github.com/hyperledger/fabric-contract-api-go/contractapi](http://github.com/hyperledger/fabric-contract-api-go/contractapi)” ####2. Different method structures There is no […]
Tag: perl
Mac M1 reports an error when installing Redis through homebrew (perl: unknown or unsupported macOS version: :dunno)
Directory 〇.Solution 1. Problem phenomenon 2. Try to solve 3. Start the service 4. Log in to the client 〇、Solution To upgrade homebrew, the command is as follows: brew update-reset 1. Problem Install Redis through the command brew install redis. The exception is as follows: fatal: not in a git directory Warning: No remote ‘origin’ […]
How to judge that the Transfer State of Spartacus SSR is working properly
In the returned index.html , you can check for the script tag, which should by default have an id of … . The way is to check the script tag in the Network tab of Chrome Developer Tools. If you find the following code snippet, it means that the Transfer State mechanism is already working: […]
Front-end lesson 2, HTML, alt, title, width/height, border, <a> hyperlink, target, tr, td, th
Table of Contents 1. title: ?2. alt 3. width/height 4. border 5. Hyperlink 6. target 7. tr 8. td 9.th 10. rowspan 一、title: Look at the beauty Yujie style <img src=” hhh.png” title=” like” > As long as your mouse is there, it will display the title logo behind you 2. alt My computer may […]
Cypress web automation 20-a tag hyperlink cross-domain issue
Foreword By default, accessing a cross-domain webpage on cypress will cause an exception: Cypress detected a cross origin error happened on page load A cross origin error happens when your application navigates to a new URL which does not match the origin policy above. When using selenium before, you don’t have to worry about this […]
Iteratively obtain the contents of hyperlink tags
import requests from lxml import etree url = “https://desk.zol.com.cn/fengjing/” resp = requests.get(url) resp.encoding = “gbk” et = etree.HTML(resp.text) domin = “https://desk.zol.com.cn” result = et.xpath(“//dl[@class=’filter-item first clearfix’]/dd[@class=’brand-sel-box clearfix’]/a/@href”) for item in result: ur = domin + item resp_ = requests.get(ur) resp_.encoding = “gbk” et_ = etree.HTML(resp_.text) result_ = et_.xpath(“//ul[@class=’pic-list2 clearfix’]/li/a/@href”) for item_ in result_: link = […]
threeJs sample, modification of webgl2_volume_perlin
The official example webgl2_volume_perlin.html draws the perlin noise, and you can intuitively feel the image shape of the perlin noise. The original example supports cubes, but I changed the cubes to spheres. <!DOCTYPE html> <html lang=”en”> <head> <title>three.js webgl2 – volume</title> <meta charset=”utf-8″> <meta name=”viewport” content=”width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0″> <link type=”text/css” rel=”stylesheet” href=”main.css”> </head> <body> […]
PERLIN NOISE
Introduction Perlin noise is designed to describe random effects in nature. It creates textures that can be applied directly to a vertex shader, rather than generating a texture map and then attaching the map to a three-dimensional object using traditional texture mapping techniques. This is equivalent to the fact that the texture will not need […]
Redis: HyperLogLog application
This article will first explain common statistical strategies for billion-level data, then introduce HyperLogLog related concepts and commands, and finally use application code examples to explain. Table of Contents Use of billions of data HyperLogLog related concepts Why use HyperLogLog for deduplication statistics? Related commands Application code example The use of billions of data Normally, […]