vue实现在页面上添加水印的示例代码

/**  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')
  // 设置canvas画布大小
  can.width = 800
  can.height = 250
  let cans = can.getContext('2d')
  cans.rotate(-10 * Math.PI / 180) // 水印旋转角度
  cans.font = '26px Vedana'
  cans.fillStyle = '#333333'
  cans.textAlign = 'center'
  cans.textBaseline = 'Middle'
  cans.fillText(str1, can.width / 2, can.height) // 水印在画布的位置x，y轴
  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"; //根据自己文件路径修改

mounted() {
    //设置水印内容，这段代码实现的是两行文本内容的水印。
    let str1 = "我是水印";
    let str2 = sessionStorage.getItem(key1)
    setWaterMark(str1, str2);
}，
destroyed() {
    removeWatermark();
  }
  ,
//sessionStorage.getItem(key1)可以获取当前登陆用户的信息，自己根据需要进行修改即可。