vue 项目实现水印效果

水深无声 2022-12-24 10:49 260阅读 0赞

**目录**

（1）新建 waterMark.js文件

（2）页面使用

--------------------

### （1）新建引入 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 = 200
      can.height = 120
    
      let cans = can.getContext('2d')
      cans.rotate(-15 * Math.PI / 180)
      cans.font = '14px Vedana'
      cans.fillStyle = '#d0d3d8' // 水印的颜色
      cans.textAlign = 'left'
      cans.textBaseline = 'Middle'
      cans.fillText(str, can.width / 3, can.height / 2)
    
      let div = document.createElement('div')
      div.id = id
      div.style.pointerEvents = 'none'
      div.style.top = '70px'
      div.style.left = '0px'
      div.style.position = 'fixed'
      div.style.zIndex = '100000'
      div.style.width = document.documentElement.clientWidth - 100 + '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）页面使用 ###

import warterMark from "../../plugins/utils/waterMark";
    mounted() {
    
        warterMark.set("我是水印水印");
        
      },