JavaScript简介

用JavaScript写个桌面级应用

• 打开cmd运行npm init创建 package.json文件(和node的基本一样)
• 然后执行一次npm install –save-dev electron-prebuilt
• 在根目录下创建main.js
• 然后在app下创建index.html文件

• 配置VS Code启动环境

  先装全局：glup： npm install gulp -g//全局安装gulp(前端自动化工具,只是为了方便)

  再装本地：npm install –save-dev gulp

• 安装 electron-packager:npm install –save-dev electron-packager

• 在项目根目录下面的 package.json 里添加代码:

  “packager”: “electron-packager ./app HelloWorld –all –out ./xxApp –version 1.4.6 –overwrite –icon=./app/img/icon/icon.ico”

• 使用命令npm run-script packager（打包）

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Introduction to JavaScript

• There are three essential data types in JavaScript: **strings, numbers, and boolean**s.
• We can write out anything to the console with console.log.
• We can do math with operators like +, -, *, and /.
• We can find the remainder after dividing two numbers with a modulus: %.
• We can generate a random number with Math.random, then make it a whole number with Math.floor.
• We write a single line comment with // and a multi-line comment with /* and */

Variables

• How to create variables:var.
• How to change a variable’s value.
• How to interpolate, or insert, a variable into a string.

Control flow

• if/else statements make binary decisions and execute separate code based on a condition.
• We can add extra conditions with to if/else statements with else if conditions.
• switch statements make complicated if/else statements easier to read, however they achieve the same result as if/else statements.
• Comparison operators, like <, >, <=, and >= can compare two variables. After they compare, they always return either true or false.
• Logical Operators, like &&, ||, !==, and !, can compare two variables to see if a certain condition exists:
  
  • && checks if both sides are true.
  • || checks if either side is true.
  • !== checks if both sides are not equal.
  • ! changes a variable that is true to false, and vice versa.

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参考文献：

1.用JavaScript写个桌面级应用