Bubbling & Capturing

Reference: What is event Bubbling and Capturing?

函数的执行时机

Key concepts about function

• Call time
• Scope
• Closure
• Parameter
• Return value
• Call Stack
• Hoisting
• Arguments (except arrow function)
• This

Create an Array

Definition:

• Unordered data collection
• Key-Value Pair collection

Execute JS code

• Preparation before execute JS code
  • Ready Work
  • Provide API: window/ document/ setTimeout
  • Above code does not belong to JS itself
  • We call these code as runtime env
  • Once put JS code into the runtime env, it starts to execute JS code

1. URL contains what? What is the function of each part of the URL?

URL => Uniform Resource Locator

1. href

Shortcut to create the ul list

1. select many lines
2. in the vscode，press ‘command +shift + p’ together
3. then search ‘emmet wrap’
4. Select ‘individual line with abbreviation’
5. enter ‘ul>li*’