网页添加水印

/*
 * @Description: 
 * @Autor: lcfeng
 * @Date: 2020-04-01 16:15:02
 * @LastEditors: lcfeng
 * @LastEditTime: 2020-08-14 10:28:15
 */
/**
 * options str   // 需要设置的名称
 * 在使用的组件处 引入后 实例化watermark对象 传入name即可
 * */

let watermark = {}

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

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

    let canvas = document.createElement('canvas')
    canvas.width = 280;
    canvas.height = 120;

    let context = canvas.getContext('2d');
    context.rotate(-20 * Math.PI / 180);
    context.font = '15px Vedana';
    context.fillStyle = 'rgba(180, 180, 180, 0.3)';
    context.textAlign = 'left';
    context.textBaseline = 'Middle';
    context.fillText(str, canvas.width / 20, canvas.height);

    let div = document.createElement('div');
    div.id = id;
    div.style.pointerEvents = 'none';
    div.style.top = '3px';
    div.style.left = '0px';
    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(' + canvas.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) => {
    setWatermark(str);
    // let id = setWatermark(str)
    // setInterval(() => {
    //   if (document.getElementById(id) === null) {
    //     id = setWatermark(str)
    //   }
    // }, 2000)
    window.onresize = () => {
        setWatermark(str)
    }
}

export default watermark;

格式化代码：

/*
 * @Description:
 * @Autor: lcfeng
 * @Date: 2020-04-01 16:15:02
 * @LastEditors: lcfeng
 * @LastEditTime: 2021-11-25 11:11:22
 */
/**
 * options str   // 需要设置的名称
 * 在使用的组件处 引入后 实例化watermark对象 传入name即可
 * */

const watermark = {}

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

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

  const canvas = document.createElement('canvas')
  canvas.width = 280
  canvas.height = 120

  const context = canvas.getContext('2d')
  context.rotate((-20 * Math.PI) / 180)
  context.font = '15px Vedana'
  context.fillStyle = 'rgba(180, 180, 180, 0.4)'
  context.textAlign = 'left'
  context.textBaseline = 'Middle'
  context.fillText(str, canvas.width / 20, canvas.height)

  const div = document.createElement('div')
  div.id = id
  div.style.pointerEvents = 'none'
  div.style.top = '3px'
  div.style.left = '0px'
  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(' + canvas.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) => {
  setWatermark(str)
  // let id = setWatermark(str)
  // setInterval(() => {
  //   if (document.getElementById(id) === null) {
  //     id = setWatermark(str)
  //   }
  // }, 2000)
  window.onresize = () => {
    setWatermark(str)
  }
}

export default watermark

使用方法：

watermark.set(userInfo.name + ' ' + userInfo.sfzh)

main.js

import watermark from '@/utils/watermark.js';
Vue.prototype.$watermark = watermark;

App.vue 

//获取用户信息
    getUserInfo((res) => {
      let userInfo = res.data.user;
      this.$watermark.set(userInfo.name + ' ' + userInfo.sfzh);
    }, (err) => {

    })