3.1.1 Hello World
Open vscode, input console.log ( "helloworld");
New Save the file named helloworld.js
Open a terminal, go to the directory where helloword.js (shift + right-blank, open a command line here) , execution node helloworld.js
Common output command
console.log
console.error
console.log is the most frequently used instructions, and printf function similar to the C language, accept any number of parameters may be, supports% d% s references to variables
3.12 Node.js command-line tool
node --help Help
The basic method of operation node.js: directly run the script
Execution node script.js
(Script.js is the file name of the script)
Another way to output Hello World:
The statement to be executed, direct execution as a parameter of node -e
