vue中添加水印效果

待我称王封你为后i 2021-09-09 03:14 607阅读 0赞

# 效果图 #

![在这里插入图片描述][25a7082682e13cd3488e61e03e4e56d7.png_pic_center]

# 创建warterMark.js文件 #

在src 目录下创建utils文件，在utils里新建warterMark.js文件

let watermark = (str) => { 
      let id = '1.23452384164.123412415'
    
      if (document.getElementById(id) !== null) { 
        document.body.removeChild(document.getElementById(id))
      }
    
      let can = document.createElement('canvas')
      can.width = 150
      can.height = 120
    
      let cans = can.getContext('2d')
      cans.rotate(-20 * Math.PI / 180)
      cans.font = '20px Vedana'
      cans.fillStyle = 'rgba(200, 200, 200, 0.2)' // 水印的颜色和透明度可在这里调整
      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
    let setWatermark = (str) => { 
      let id = watermark(str)
      setInterval(() => { 
        if (document.getElementById(id) === null) { 
          id = watermark(str)
        }
      }, 500)
      window.onresize = () => { 
        watermark(str)
      }
    }
    
    export { 
      setWatermark
    }

# 使用方式 #

<template>
      <div id="app">
        <router-view/>
      </div>
    </template>
    
    <script>
    import {  setWatermark } from './utils/warterMark'
    export default { 
      name: 'App',
      mounted: function () { 
        setWatermark('水印') // 水印内容写在这里
      }
    }
    </script>
    <style>
    </style>

[25a7082682e13cd3488e61e03e4e56d7.png_pic_center]: /images/20210813/4b55ae8d53084d7cbb1dd38568725a3f.png