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wj-test-project

v1.0.0

Published

基于canvas生成水印

Downloads

19

Readme

生成水印

前言

其一:在PC端,对内部系统的截图应该考虑安全问题,截图内容不管是否敏感不可泄露,安全问题也不容忽视。

为整个系统页面增加水印,对于内部人员的截图等敏感操作能够起到一定的提示作用。

其二:对于移动端,类似于渣浪微博在发布动态后会为图片添加带有个人标记的水印。

本库基于canvas提供以上两种添加水印的方式。

Usage

npm i @careteen/watermark -D

then

import waterMark from '@careteen/watermark'
waterMark({
  type: 'page',
  content: 'careteen'
})
// or
waterMark({
  type: 'image',
  url: 'http://localhost:3000/imgs/google.png',
  content: 'careteen',
  cb: (base64Url) => {
    document.querySelector('img').src = base64Url
  }
})

API

  • typepage时,为整个网页添加水印,其他属性默认值如下:
    • width = '300px'
    • height = '200px'
    • textAlign = 'center'
    • textBaseline = 'middle'
    • font = "20px Microsoft Yahei"
    • fillStyle = 'rgba(184, 184, 184, 0.6)'
    • content = '请勿外传'
    • rotate = '30'
    • zIndex = 1000
  • typeimage时,为特定图片添加水印,其他属性默认值如下:
    • url = ''
    • textAlign = 'center'
    • textBaseline = 'middle'
    • font = "20px Microsoft Yahei"
    • fillStyle = 'rgba(184, 184, 184, 0.8)'
    • content = '请勿外传'
    • cb = null
    • textX = 100
    • textY = 30

TODO

  • svg 生成水印
  • NodeJs 生成水印