• How to develop UHF reader in Google chome browser


    Google Chrome doesn’t support OCX, so it can’t connect UHF reader and writer through OCX. It can only use RFID reader and writer cloud service plug-in to connect and operate UHF reader and writer yw-602h through JavaScript language. RFID reader cloud service plug-in supports not only Chrome browser, but also Firefox, ie, Safari, opera and […]

  • Cloud Development Through Browser


    cloud-development-through-browser You are welcome to subscribe to the public address to get a real-time push. Now is the era of cloud computing. As a developer, we should also embrace the cloud oriented development mode instead of limiting ourselves to specific high-performance development machines. Whether it’s windows or Linux or Mac OS, iPhone or Android, or […]

  • Spring advanced annotation


    Catalog: 1. Use limited notes;2. User defined notes;3. User defined bean life cycle; Development environment: IntelliJ idea February 2, 2019Spring boot version: 2.1.8Create a new spring boot project named demo. I. limited notes When there are multiple beans of the same type, the primary annotation can be used to specify the bean to be injected […]

  • Summary of front end performance optimization


    Here are some optimization strategies we have used in our own projects, which are summarized: Image optimization Priority selectionwebpformat The advantage of webp is that it has a better image data compression algorithm, which can bring smaller image volume, and has no difference in image quality recognized by the naked eye; at the same time, […]

  • [H5 wake up app] fast access to the core page of app


    Under the background of Internet with traffic as the king, H5 page of mobile terminal obviously plays an important role in the diversion. On H5 page, we have two requirements for the diversion: First, guide the downloaded users to wake up the app from the H5 page and go directly to the specified scene Second, […]

  • How to install Google Chrome browser in Ubuntu 18.04


    1. Open “https://www.google.cn/chrome/” with the existing browser Then you will see the words “download chrome”. Click download to pop up the download prompt message. My Ubuntu system can directly choose to accept and save the file. 2. Enter the following commands in turn sudo apt update sudo apt upgrade sudo dpkg -i google-chrome.deb Note: the […]

  • JavaScript implementation upload pictures and show


    We all know that the image uploaded looks like this (before selection)It’s like this (after selection)。   Set up image upload in HTML first Upload pictures Then edit the CSS Style #file{ display: none; } #file + label{ display: inline-block; width: 100px; height: 30px; background-color: rgb(90, 152, 222); text-align: center; line-height: 30px; border-radius: 5px; } […]

  • JavaScript BOM navigator screen (21)


    Catalog: 1. Navigator object 2. Screen object I. Navigator object 1. What is a Navigator object? The Navigator object contains information about the browser.Note: there is no public standard applied to navigator objects, but all browsers support this object. 2. Use of Navigator object Navigator object represents the information of current browser, through which different […]

  • [chrome source reading series] chrome multi process architecture


    This document describes the top-level architecture design of chromium Background of problem It is basically impossible to build a rendering engine without crash and suspension, and it is also basically impossible to build a completely safe rendering engine. To some extent, the web browser around 2006 is just like the operating system of single user […]

  • HTTP’s world view (with HTTP / 3 Chinese translation)


    Apperception: 🌟🌟🌟🌟🌟🌟🌟🌟🌟 Taste: black sugar Pearl Cooking time: 15min With the explosive growth of front-end technology, developers feel tired, anxious and lazy. JQuery is coming to an end. React V16 has been popularized and angular9 and vue3 will be released soon. The three frameworks are more and more close to the web components standard.Typescript is […]

  • JS create, write, read file, FileSystemObject


    FileSystemObject FileSystemObject is an IIS built-in component that accesses the file system on the server (such as operating a disk, folder, or text file). FSO cannot operate binary files. To operate binary files, use: adodb.stream. When creating a file object, we usually define an FSO object variable to get the FileSystemObject object.var fso=new ActiveXObject(“Scripting.FileSystemObject”); The […]

  • HTML 5 implementation of no refresh modification URL


    Preface Today, we are doing a Vue search function. We need to jump from the search results page to the details page, and then click back to return to the just results page. If we only use window.history.go (- 1), of course, we will refresh the search page again, of course not. I tried two […]