vue网页添加水印

水印添加方式：1.新建 waterMark.js 内容如下

let watermarkOption = {}
 
let setWatermarkContent = (content) => {
  let id = '1.23452384164.123412415'
 
  if (document.getElementById(id) !== null) {
    document.body.removeChild(document.getElementById(id))
  }
 
  let ele = document.createElement('canvas')
  ele.width = 250
  ele.height = 150
 
  let getCanvas = ele.getContext('2d')
  getCanvas.rotate(-20 * Math.PI / 180)
  getCanvas.font = '20px Vedana'
  getCanvas.fillStyle = 'rgba(200, 200, 200, 0.20)'
  getCanvas.textAlign = 'center'
  getCanvas.textBaseline = 'Middle'
  getCanvas.fillText(content, ele.width / 3, ele.height / 2)
 
  let div = document.createElement('div')
  div.id = id
  div.style.pointerEvents = 'none'
  div.style.top = '0px'    // 水印距离 上边的距离
  div.style.left = '0px'  // 水印距离 左边的距离
  div.style.position = 'fixed'
  div.style.zIndex = '100000'
  div.style.width = document.documentElement.clientWidth - 100 + 'px'    // 生成水印画布大小的宽度
  div.style.height = document.documentElement.clientHeight - 100 + 'px'  // 生成水印画布大小的高度
  div.style.background = 'url(' + ele.toDataURL('image/png') + ') left top repeat'
  document.body.appendChild(div)
  return id
}
 
// 该方法只允许调用一次
watermarkOption.set = (content) => {
  let id = setWatermarkContent(content)
  setInterval(() => {
    if (document.getElementById(id) === null) {
      id = setWatermarkContent(content)
    }
  }, 500)
  window.onresize = () => {
    setWatermarkContent(content)
  }
}

export default watermarkOption

2.在入口app引入