vue项目中添加水印

效果：

1556260727675_图片.png

1.创建watermark.js 文件

'use strict'

let watermark = {}

let setWatermark = (str) => {
  let id = '1.23452384164.123412415'

  if (document.getElementById(id) !== null) {
    document.body.removeChild(document.getElementById(id))
  }

  let can = document.createElement('canvas')
  can.width = 160
  can.height = 180

  let cans = can.getContext('2d')
  cans.rotate(-20 * Math.PI / 180)
  cans.font = '16px Vedana'
  cans.fillStyle = 'rgba(200, 200, 200, 0.40)'
  cans.textAlign = 'left'
  cans.textBaseline = 'Middle'
  cans.fillText(str, can.width / 16, can.height / 2)

  let div = document.createElement('div')
  div.id = id
  div.style.pointerEvents = 'none'
  div.style.top = '70px'
  div.style.left = '240px'
  div.style.position = 'fixed'
  div.style.zIndex = '100'
  div.style.width = document.documentElement.clientWidth - 10 + 'px'
  div.style.height = document.documentElement.clientHeight - 100 + 'px'
  div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat'
  document.body.appendChild(div)
  return id
}

// 该方法只允许调用一次
watermark.set = (str) => {
  let id = setWatermark(str)
  setInterval(() => {
    if (document.getElementById(id) === null) {
      id = setWatermark(str)
    }
  }, 500)
  window.onresize = () => {
    setWatermark(str)
  }
}

export default watermark

2.在main.js中引入,设置

  import Watermark from './plugins/watermark';

new Vue({
    el: '#app', 
    components: { App },
    template: '<App/>',
    created() {
      Watermark.set(“这是内容”);
    }
});

感谢原作者舟遥遥