/**  水印添加方法  */
let setWatermark = (str1, str2) => {
  let id = '1.23452384164.123412415'
 
  if (document.getElementById(id) !== null) {
    document.body.removeChild(document.getElementById(id))
  }
  let can = document.createElement('canvas')
  // 設(shè)置canvas畫布大小
  can.width = 800
  can.height = 250
  let cans = can.getContext('2d')
  cans.rotate(-10 * Math.PI / 180) // 水印旋轉(zhuǎn)角度
  cans.font = '26px Vedana'
  cans.fillStyle = '#333333'
  cans.textAlign = 'center'
  cans.textBaseline = 'Middle'
  cans.fillText(str1, can.width / 2, can.height) // 水印在畫布的位置x，y軸
  cans.fillText(str2, can.width / 2, can.height + 30)
 
  let div = document.createElement('div')
  div.id = id
  div.style.pointerEvents = 'none'
  div.style.top = '140px'
  div.style.left = '0px'
  div.style.opacity = '0.3'
  div.style.position = 'fixed'
  div.style.zIndex = '100000'
  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
}
 
// 添加水印方法
export const setWaterMark = (str1, str2) => {
  let id = setWatermark(str1, str2)
  if (document.getElementById(id) === null) {
    id = setWatermark(str1, str2)
  }
}
 
// 移除水印方法
export const removeWatermark = () => {
  let id = '1.23452384164.123412415'
  if (document.getElementById(id) !== null) {
    document.body.removeChild(document.getElementById(id))
  }
}

import { removeWatermark, setWaterMark } from "@/../../waterMark"; //根據(jù)自己文件路徑修改

mounted() {
    //設(shè)置水印內(nèi)容，這段代碼實(shí)現(xiàn)的是兩行文本內(nèi)容的水印。
    let str1 = "我是水印";
    let str2 = sessionStorage.getItem(key1)
    setWaterMark(str1, str2);
}，
destroyed() {
    removeWatermark();
  }
  ,
//sessionStorage.getItem(key1)可以獲取當(dāng)前登陸用戶的信息，自己根據(jù)需要進(jìn)行修改即可。