React realizes the whole process of page watermark effect

import React from 'react'
import ReactDOM from 'react-dom'
import './index.css'
import WaterMarkContent from './components/WaterMarkContent'
import App from './App'

ReactDOM.render(
  <React.StrictMode>
    <WaterMarkContent>
      <App />
    </WaterMarkContent>
  </React.StrictMode>,
  document.getElementById('root')
)

  const { text = 'waterMark', fontSize = 16, fillOpacity = '0.2', fillColor = '#000' } = props
  const res = `
      <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="180px" height="180px" viewBox="0 0 180 180">
        <text x="-100" y="-30" fill='${fillColor}' transform = "rotate(-35 220 -220)" fill-opacity='${fillOpacity}' font-size='${fontSize}'> ${text}</text>
      </svg>`

 const blob = new Blob([res], {
    type: 'image/svg+xml',
  })

 const url = URL.createObjectURL(blob)

    <div
      style={{
        position: 'absolute',
        width: '100%',
        height: '100%',
        backgroundImage: `url(${url})`,
        top: 0,
        left: 0,
        zIndex: 999,
        pointerEvents: 'none', //click through}}
    ></div>

import React from 'react'
import { ReactNode, useMemo } from 'react'

type svgPropsType = {
  text?: string
  fontSize?: number
  fillOpacity?: number
  fillColor?: string
}
const SvgTextBg = (props: svgPropsType) => {
  const { text = 'waterMark', fontSize = 16, fillOpacity = '0.2', fillColor = '#000' } = props
  const res = `
      <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="180px" height="180px" viewBox="0 0 180 180">
        <text x="-100" y="-30" fill='${fillColor}' transform = "rotate(-35 220 -220)" fill-opacity='${fillOpacity}' font-size='${fontSize}'> ${text}</text>
      </svg>`

  const blob = new Blob([res], {
    type: 'image/svg+xml',
  })

  const url = URL.createObjectURL(blob)

  return (
    <div
      style={{
        position: 'absolute',
        width: '100%',
        height: '100%',
        backgroundImage: `url(${url})`,
        top: 0,
        left: 0,
        zIndex: 999,
        pointerEvents: 'none', //click through}}
    ></div>
  )
}

type propsType = {
  children?: ReactNode
} & Partial<svgPropsType>

const WaterMarkContent = (props: propsType) => {
  const { text, fontSize, fillOpacity, fillColor } = props

  const memoInfo = useMemo(
    () => ({
      text,
      fontSize,
      fillOpacity,
      fillColor,
    }),
    [text, fontSize, fillOpacity, fillColor]
  )
  return (
    <div style={{ position: 'relative', width: '100%', height: ' 100%' }}>
      {props.children}
      <SvgTextBg {...memoInfo} />
    </div>
  )
}

export default WaterMarkContent