How to make a simple browser user extension

• Create a new desktop folder: customScript
• New: the manifest. Json
• Paste the following code:

{
  "name": "My Extension"."version": "2.1"."description": "cool pointer."."icons": {},"content_scripts": [{"matches": [
        "* : / / * / *"]."js": [
        "coolPointerEeffects.js"]}],"manifest_version": 2."browser_action": {}}Copy the code

• New: coolPointerEeffects. Js
• Paste the following code:

class Circle {
  constructor({ origin, speed, color, angle, context }) {
    this.origin = origin
    this.position = { ... this.origin }this.color = color
    this.speed = speed
    this.angle = angle
    this.context = context
    this.renderCount = 0
  }

  draw() {
    this.context.fillStyle = this.color
    this.context.beginPath()
    this.context.arc(this.position.x, this.position.y, 2.0.Math.PI * 2)
    this.context.fill()
  }

  move() {
    this.position.x = (Math.sin(this.angle) * this.speed) + this.position.x
    this.position.y = (Math.cos(this.angle) * this.speed) + this.position.y + (this.renderCount * 0.3)
    this.renderCount++
  }
}

class Boom {
  constructor({ origin, context, circleCount = 10, area }) {
    this.origin = origin
    this.context = context
    this.circleCount = circleCount
    this.area = area
    this.stop = false
    this.circles = []
  }

  randomArray(range) {
    const length = range.length
    const randomIndex = Math.floor(length * Math.random())
    return range[randomIndex]
  }

  randomColor() {
    const range = ['1'.'2'.'3'.'4'.'5'.'6'.'7'.'8'.'9'.'A'.'B'.'C'.'D'.'E'.'F']
    return The '#' + this.randomArray(range) + this.randomArray(range) + this.randomArray(range) + this.randomArray(range) + this.randomArray(range) + this.randomArray(range)
  }

  randomRange(start, end) {
    return (end - start) * Math.random() + start
  }

  init() {
    for (let i = 0; i < this.circleCount; i++) {
      const circle = new Circle({
        context: this.context,
        origin: this.origin,
        color: this.randomColor(),
        angle: this.randomRange(Math.PI - 1.Math.PI + 1),
        speed: this.randomRange(1.6)})this.circles.push(circle)
    }
  }

  move() {
    this.circles.forEach((circle, index) = > {
      if (circle.position.x > this.area.width || circle.position.y > this.area.height) {
        return this.circles.splice(index, 1)
      }
      circle.move()
    })
    if (this.circles.length == 0) {
      this.stop = true}}draw() {
    this.circles.forEach(circle= > circle.draw())
  }
}

class CursorSpecialEffects {
  constructor() {
    this.computerCanvas = document.createElement('canvas')
    this.renderCanvas = document.createElement('canvas')

    this.computerContext = this.computerCanvas.getContext('2d')
    this.renderContext = this.renderCanvas.getContext('2d')

    this.globalWidth = window.innerWidth
    this.globalHeight = window.innerHeight

    this.booms = []
    this.running = false
  }

  handleMouseDown(e) {
    const boom = new Boom({
      origin: { x: e.clientX, y: e.clientY },
      context: this.computerContext,
      area: {
        width: this.globalWidth,
        height: this.globalHeight
      }
    })
    boom.init()
    this.booms.push(boom)
    this.running || this.run()
  }

  handlePageHide() {
    this.booms = []
    this.running = false
  }

  init() {
    const style = this.renderCanvas.style
    style.position = 'fixed'
    style.top = style.left = 0
    style.zIndex = '999999999999999999999999999999999999999999'
    style.pointerEvents = 'none'

    style.width = this.renderCanvas.width = this.computerCanvas.width = this.globalWidth
    style.height = this.renderCanvas.height = this.computerCanvas.height = this.globalHeight

    document.body.append(this.renderCanvas)

    window.addEventListener('mousedown'.this.handleMouseDown.bind(this))
-     window.addEventListener('pagehide'.this.handlePageHide.bind(this))}run() {
    this.running = true
    if (this.booms.length == 0) {
      return this.running = false
    }

    requestAnimationFrame(this.run.bind(this))

    this.computerContext.clearRect(0.0.this.globalWidth, this.globalHeight)
    this.renderContext.clearRect(0.0.this.globalWidth, this.globalHeight)

    this.booms.forEach((boom, index) = > {
      if (boom.stop) {
        return this.booms.splice(index, 1)
      }
      boom.move()
      boom.draw()
    })
    this.renderContext.drawImage(this.computerCanvas, 0.0.this.globalWidth, this.globalHeight)
  }
}

const cursorSpecialEffects = new CursorSpecialEffects()
cursorSpecialEffects.init()
Copy the code

• Google Chrome address bar post:chrome://extensions/enter
• Open developer mode on the right, click load the unzipped extension and select the script folder customScript

At this time enter any TAB page click will have a surprise oh!

So far: a simple browser user extension is completed