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  • (转)网页加水印方法

    转自:https://segmentfault.com/a/1190000022055867

    watermark.js

    let setWatermark = (str1, str2) => {
      let id = '1.23452384164.123412415'
    
      if (document.getElementById(id) !== null) {
        document.body.removeChild(document.getElementById(id))
      }
    
      let can = document.createElement('canvas')
      // 设置canvas画布大小
      can.width = 150
      can.height = 80
    
      let cans = can.getContext('2d')
      cans.rotate(-20 * Math.PI / 180) // 水印旋转角度
      cans.font = '15px Vedana'
      cans.fillStyle = '#666666'
      cans.textAlign = 'center'
      cans.textBaseline = 'Middle'
      cans.fillText(str1, can.width / 2, can.height) // 水印在画布的位置x,y轴
      cans.fillText(str2, can.width / 2, can.height + 22)
    
      let div = document.createElement('div')
      div.id = id
      div.style.pointerEvents = 'none'
      div.style.top = '40px'
      div.style.left = '0px'
      div.style.opacity = '0.15'
      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(' + can.toDataURL('image/png') + ') left top repeat'
      document.body.appendChild(div)
      return id
    }
    
    // 添加水印方法
    export const setWaterMark = (str1, str2) => {
      let id = setWatermark(str1, str2)
      if (document.getElementById(id) === null) {
        id = setWatermark(str1, str2)
      }
    }
    
    // 移除水印方法
    export const removeWatermark = () => {
      let id = '1.23452384164.123412415'
      if (document.getElementById(id) !== null) {
        document.body.removeChild(document.getElementById(id))
      }
    }

    调用

    import {removeWatermark, setWaterMark} from '@/uitls/watermark'
    
      mounted () {
        setWaterMark('1236', '管理员')
      },
      destroyed () {
        removeWatermark()
      }
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  • 原文地址:https://www.cnblogs.com/ronle/p/14347154.html
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