Example 1 ```javascript let person = ‘Mike’ let age = 28

```javascript

1. rm -rf dist // this is clear the dist if you want to build a brand new parcel of your code
2. parcel build src/index.html –no-minify –public-url ./

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