The function of Ethereum electron
1. Application of different
digital currency: fast, economic and safe payment and settlement; Bill finance and supply chain finance; The real right of collateral is digitalized
e-money: the seller sends the buyer's payment instructions to the seller's acquiring bank through the payment gateway; The acquiring bank obtains the authorization from the issuing bank through the bank card network, and sends the authorization information back to the seller through the payment gateway; After obtaining the authorization, the Seller shall send the buyer the shopping completion information. If payment acquisition and payment authorization cannot be completed at the same time, the seller should send payment acquisition request to the acquiring bank through the payment gateway, and transfer the transaction funds from the buyer to the seller's account. The final inter-bank settlement is completed by the payment system between banks
2. Different characteristics
digital currency is characterized by low transaction cost, fast transaction speed and high anonymity
e-currency is characterized by anonymity, saving transaction cost, saving transmission cost, small holding risk, flexible and convenient payment, anti-counterfeiting and anti repetition, and non traceability
Digital currency can be divided into three categories: completely closed, unrelated to the real economy and only used in specific virtual communities, such as world of warcraft gold; It can be purchased in real currency but not converted back to real currency, and can be used to purchase virtual goods and services, such as Facebook credit; It can exchange and redeem with real currency according to a certain ratio. It can purchase both virtual goods and services and real goods and services, such as bitcoine-money: e-cash based on the Internet environment and keeping the binary data representing the value of money in the hard disk of the computer terminal; An electronic wallet that keeps the value of money in an IC card and can be circulated out of the bank payment system
the second step is to create a new empty folder as the root directory of the application and give the folder a name, here is app
the third step is to click "file" in the upper left corner of the window in the figure above and select "open windows power shell"
the fourth step is to initialize. Input command: & quot; npm init"， As shown in the figure below,
in this step, enter the command & quot; npm init" After that, you will be asked to set some options, such as name, version, description in the figure above. In these settings, you need to set & quot; entry point" Change to & quot; main.js"， The rest can be skipped by pressing enter directly. After setting, is this OK? Will appear Yes), enter & quot; yes"， The initialization is over, and the application root directory will display a file named & quot; package.json" As shown in the figure below:
after that, we need to modify the content of package.json, open package.json and add & quot; scripts" Change the content in to & quot; start": & quot; electron ."：
after modifying, you can save it
Step 5: install the electron. First, find the file. Npmrc in your user directory (just find the directory corresponding to your user name in the "user" directory of Disk C), open. Npmrc, and add:
[plain] view plain
registry at the end of the file= https://registry.npm.taobao.org
sass_ binary_ site= https://npm.taobao.org/mirrors/node-sass/
phantomjs_ cdnurl= http://npm.taobao.org/mirrors/phantomjs
ELECTRON_ MIRROR= http://npm.taobao.org/mirrors/electron/
the purpose of doing this is to change the download address to the domestic Taobao image to improve the download speed. If you don't do this step, you will definitely get stuck on node install.js ring the installation of electron, resulting in the installation failure
then enter the command & quot; npm install electron --save-dev --verbose"， Start the installation, the first installation will be a little slower, and then it will be very fast:
Step 6, write main.js, create a new file main.js in the root directory, and enter the following code:
[JavaScript] view plain
const electron = require (# 39; electron');< br />const app=electron.app;< br />const path=require(' path');< br />const url=require(' url');< br />const BrowserWindow=electron.BrowserWindow;
/ / initialize and prepare to create the main window
app. On (& 39; ready', Function () {
/ / create a window with width of 800px and height of 500px
MainWindow = new browserwindow ({
width: 800,
height: 500,
})
/ / load the application's inde.html
mainwindow.loarl (URL. Format ({
) pathname:path.join (__ dirname,'/ index.html'),< br />protocol:' file:',< br /> slashes:true
}));
/ / trigger when the window is closed
MainWindow. On (& 39; closed', Function () {
/ / to cancel the reference of window objects, if your application supports multiple windows, you need to store all window objects in an array, and then delete the corresponding element here
MainWindow = null
})< br />});
the seventh step is to write index.html, which can be written according to your own needs. Here is a simple hello, world, with the code as follows:
[HTML] view plain
& lt;! DOCTYPE html>< br />< html>< br />< head>< br />< title> HelloWorld!& lt;/ title>< br /></ head>< br />< body>< br />< h1> Hello World!& lt;/ h1>< br /></ body>< br /></ html>
as the last step, enter & quot; npm start" You can start the application, as shown in the figure below:
it's done.
Electron is one of the basic particles of an atom. It has a very small mass and a unit negative charge. Different atoms have different numbers of electrons. For example, each carbon atom contains six electrons and each oxygen atom contains eight electrons. The higher the energy, the nearer the nucleus. Generally speaking, the movement of electrons in different regions near and far from the nucleus is called the layered arrangement of electrons. Electron is one of the sub protoplasts with unit negative charge, usually marked as E & # 8315;. Electrons belong to leptons and interact with other particles by gravity, electromagnetic force and weak nuclear force. Leptons are one of the basic particles of matter, that is, they cannot be decomposed into smaller particles. Electrons and positrons collide and repel each other, creating more than one pair of photons in the process. The electron is negatively charged and revolves around the nucleus. The interaction force of electrons moving at the speed of light in the same direction is zero. Recent experiments have shown that electrons are composed of orbitons, autorotations and holes. The electron with half spin is a fermion. Therefore, according to Pauli's incompatibility principle, no two electrons can be in the same state. The antiparticle of an electron is a positron, whose mass, spin and charge are the same as that of an electron, but the positive and negative of charge are opposite to that of an electron; Electrons and positrons will annihilate each other e to collision. In this process, more than one pair of photons are created (the mass of photons is much smaller than that of electrons, the mass of electrons is 9.10938215 (45)) × 10⁻&# 179;&# 185; Kilogram
the most general understanding is the interaction between electron and nucleus. Because the phonon refers to the vibration effect of the nucleus, which is the interaction between the electron and the nucleus.
valence electron refers to the electron outside the nucleus that can interact with other atoms to form chemical bonds
the valence electrons of the main group elements are the outermost electrons of the atoms of the main group elements; The valence electrons of transition elements are not only the outermost electrons, but also the second outermost electrons and the penultimate electrons of some elements
valence electrons are the electrons that can be used for bonding when atoms participate in chemical reactions, and are the electrons related to the valence of elements outside the nucleus. In the main group elements, the valence electron number is the outermost electron number. In addition to the outermost electrons, the valence electrons of atoms of paragroup elements can also include the secondary outer electrons. For example, the valence electron layer structure of chromium is 3d54s1, and all six valence electrons can participate in the bonding. Lanthanides can also include 4f electrons in the third layer. All valence electrons participate in the bonding, and the element shows the highest positive valence; Part of the bond, there are a variety of valence characteristics. For example, the highest valence of chromium is + 6, in addition to + 5, + 4, + 3, + 2, + 1 and so on. In addition to the second periodic elements, there are generally nd empty orbits in the main group elements. When these elements combine with more electronegative elements, the valence electrons on the outermost layer can be separated into nd orbitals, and then these elements show higher valence through orbital hybridization.