vue实现页面添加水印

let setWatermark = (str1, str2, str3) => {
let id = '1.23452384164.123412415'
    if (document.getElementById(id) !== null) {
        document.body.removeChild(document.getElementById(id))
    }
    let can = document.createElement('canvas')
    can.width = 270
    can.height = 100
    let cans = can.getContext('2d')
    cans.rotate(-20 * Math.PI / 180)
    cans.font = '17px Vedana'
    cans.fillStyle = '#666666'
    cans.textAlign = 'center'
    cans.textBaseline = 'Middle'
    cans.fillText(str1, can.width / 2, can.height)
    cans.fillText(str2, can.width / 2, can.height + 20)
    cans.fillText(str3, can.width / 2, can.height + 40)
    let div = document.createElement('div')
    div.id = id
    div.style.pointerEvents = 'none'
    div.style.top = '20px'
    div.style.left = '0px'
    div.style.opacity = '0.15'
    div.style.position = 'fixed'
    div.style.width = document.documentElement.clientWidth + 'px'
    div.style.height = document.documentElement.clientHeight + 'px'
    div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat'
    document.body.appendChild(div)
    return id
}
// 添加水印
export const setWaterMark = (str1, str2, str3) => {
    let id = setWatermark(str1, str2, str3)
    if (document.getElementById(id) === null) {
        id = setWatermark(str1, str2, str3)
    }
}
// 移除水印
export const removeWatermark = () => {
    let id = '1.23452384164.123412415'
    if (document.getElementById(id) !== null) {
        document.body.removeChild(document.getElementById(id))
    }
}

:style="{ backgroundImage: `url(${orgBackground})` }"

import { removeWatermark, setWaterMark } from '@/libs/watermark'

orgBackground: '',

setWaterMark(str1, str2, str3);