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l-watermark

v2.1.2

Published

l-watermark:一个支持TS的前端水印SDK,可以自由的在图片或前端页面中添加各种形式和内容的水印(或暗水印)!

Downloads

54

Readme

简体中文 | English

其他版本:GitHubTags

一、什么是l-watermark?

l-watermark 是一个基于TS的WEB前端水印SDK,它包含:

  • 能够覆盖多场景的水印添加方法
    1. 网页添加文字/图片水印
    2. 图片添加文字/图片水印
    3. 给图片添加暗水印
    4. 暗水印图片解密
  • 守护水印不被篡改和删除
  • 提供多种回调函数
    1. onchange: 用户试图篡改或删除水印时的回调,你在此时获取用户id并上报给服务器
    2. onerror: 水印添加失败时的回调,你可以看到水印添加失败的原因
    3. success: 水印添加成功时的回调,你可以获取加了水印的图片base64
  • 自定义水印样式
    1. 自定义颜色、字体大小、层级、间距、透明度、旋转角度等
    2. 自定义图片中水印的位置:铺满、中间、左上角、右下角等

二、安装

2.1 npm

推荐使用 npm 方式安装最新版

npm install l-watermark
import WaterMark from "l-watermark"

2.2 CDN

你可以通过 unpkg.com/l-watermark 来获取最新的 SDK,当然你也可以指定 @x.x.x 来获取特定版本的 SDK,然后在合适的位置引入即可

<script src="https://unpkg.com/[email protected]/dist/l-watermark.umd.js"></script>

三、使用示例

3.1 给WEB页面添加/移除水印

3.1.1 全屏添加文字水印

WaterMark.page({
  targe: document.body,
  text: "Internal Data",
  color: "rgba(0, 0, 0, 0.4)",
  fontSize: 24
})

page-demo-1

3.1.2 部分区域添加图片水印

WaterMark.page({
  targe: document.getElementById("hello_world"),
  image: "https://cdn.jsdelivr.net/gh/CleverLiurx/image_repo/glass15-wm.png",
  cSpace: 20,
  vSpace: 50
})

image-demo-8

3.1.2 移除页面水印

// 创建水印
const demoWaterMark = WaterMark.page({})
// 移除水印
demoWaterMark.remove()

3.2 给图片添加水印

3.2.1 添加文字水印

WaterMark.image({
  target: document.getElementById('demo-image'),
  text: 'Angelababy',
  cSpace: 20,
  color: 'rgba(0,0,0,0.6)',
  fontSize: 20,
})

image-demo-1

3.2.2 添加图片水印

WaterMark.image({
  target: document.getElementById('demo-image'),
  image: "https://cdn.jsdelivr.net/gh/CleverLiurx/image_repo/glass15-wm.png",
  cSpace: 20,
  vSpace: 20,
  imageWidth: 60,
  imageHeight: 40
})

image-demo-2

3.2.3 指定位置添加文字/图片水印

// 右下角添加文字水印
WaterMark.image({
  target: document.getElementById('demo-image'),
  position: "bottomRight",
  text: '@ GitHub - CleverLiurx',
  color: 'rgba(255, 0, 0, 1)',
  fontSize: 20,
  cSpace: 20,
  vSpace: 10,
})

image-demo-3

// 左上角添加图片水印
WaterMark.image({
  target: document.getElementById('demo-image'),
  position: "topLeft",
  image: "https://cdn.jsdelivr.net/gh/CleverLiurx/image_repo/glass15-wm.png",
  imageWidth: 100,
  imageHeight: 60,
  cSpace: 20,
  vSpace: 20
})

image-demo-4

3.2.4 获取加了水印的base64图片

由于 target 不是 HTMLImageElement 类型,所以加完水印后页面不会有任何变化,但是你可以通过 success 回调获取加完水印的base64图片

WaterMark.image({
  target: "https://cdn.jsdelivr.net/gh/CleverLiurx/image_repo/ab-v1.0.0-demo.png",
  text: 'Angelababy',
  cSpace: 100,
  success: (data) => console.log(data),
})

image-demo-5

3.2.5 暗水印加密/解密

设置暗水印仅需要把 secret 设为 true 即可,但是 暗水印此版本仅支持文字模式,暂不支持图片模式

WaterMark.image({
  target: document.getElementById("demo-image"),
  text: "User Id: 1008611",
  position: 'center',
  secret: true,
})

添加完暗水印后,肉眼看起来新图片与原图没有任何区别

image-demo-7

但是调用暗水印解密工具 WaterMark.utils.decodeImage(src) 后发现水印文字显示出来了

const decodeImage = async () => {
  const imgDom = document.getElementById("demo-image")
  const decodeSrc = await WaterMark.utils.decodeImage(imgDom.src)
  imgDom.src = decodeSrc
}

image-demo-6

四、选项

4.1 页面加水印 WaterMark.page(PageOp)


| 选项 | 默认值 | 说明 | 类型 | 是否必填 | | ----------- | --------------------- | -------------------------------------- | --------------- | ----------- | | target | document.body | 添加水印的元素 | HTMLElement | 否 | | containerEl | document.body | 同target,2.0.6版本后不建议使用 | HTMLElement | 否 | | text | Demo Text | 水印文本(与image二选一) | string | 否 | | image | | 水印图片(与text二选一) | string(img.src) | 否 | | color | "rgba(0, 0, 0, 0.15)" | 颜色(图片水印时无效) | string | 否 | | fontSize | 24 | 字体大小(图片水印时无效) | number|string | 否 | | zIndex | "10000" | 水印的层级 | number|string | 否 | | cSpace | 0 | 单个水印间的横向间距 | number|string | 否 | | vSpace | 0 | 单个水印间的纵向间距 | number|string | 否 |

4.2 图片加水印 WaterMark.image(ImageOp)


| 选项 | 默认值 | 说明 | 类型 | 是否必填 | | ----------- | --------------------- | -------------------------------------- | --------------- | ----------- | | target | | 要加水印的目标 | HTMLImageElement|string(img.src) | 是 | | text | "Demo Text" | 水印文本(与image二选一) | string | 否 | | image | | 水印图片(与text二选一) | string(img.src) | 否 | | imageWidth | | 水印图片的宽度 | number|string | 否 | | imageHeight | | 水印图片的高度 | number|string | 否 | | secret | false | 开启暗水印 | boolean | 否 | | color | "rgba(0, 0, 0, 0.15)" | 颜色(图片水印时无效) | string | 否 | | fontSize | 24 | 字体大小(图片水印时无效) | number|string | 否 | | position | "repeat" | 水印的位置(默认repeat,铺满;其他选项在指定位置添加一个水印) | string(repeat |center |bottomRight |bottomLeft |topLeft |topRight) | 否 |

注:img.src 代表其可以为图片路径、url地址、base64

4.3 工具函数 WaterMark.utils

4.3.1 暗水印解密 WaterMark.utils.decodeImage

接收一个 string 类型参数(img.src),返回 Promise<string> ,用法:

const imgBase64 = await WaterMark.utils.decodeImage(url)

4.3.2 暗水印加密 WaterMark.utils.encodeImage

当然你可以使用 WaterMark.image({}) 中的 success 回调来获取加水印后的图片,但是我们也提供了一个工具函数让你为图片添加暗水印后获取其base64,返回 Promise<string>,用法:

const imgBase64 = await WaterMark.utils.decodeImage({ImageOp})

4.4 API

移除页面水印 remove()

// 创建水印
const demoWaterMark = WaterMark.page({})
// 移除
demoWaterMark.remove()