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canvas2file

v1.0.4

Published

A lib for saving or converting canvas as file like img.

Downloads

6

Readme

🎨canvas2file

语言:English

<canvas>转化为<img>的Javascript库,轻而易举地转化和下载。

快速开始

npm引入

npm i canvas2file
import Canvas2File from 'canvas2file';

直接引入

1⃣️ 在body下引入canvas2file.js

<script src="canvas2file.js"></script>

2⃣️ 将你的JavaScript代码插入到canvas2file.js之下,以确保你在你的js文件内Canvas2File能被正确地识别。

使用说明

当引入canvas2file.js的时候,你就能愉快地使用Canvas2File对象了。

查看演示

Example:

Canvas2File.insertImg('canvas','box');
Canvas2File.insertImg('canvas','box',1);
Canvas2File.download('canvas');
Canvas2File.download('canvas','imageName');
Canvas2File.download('canvas','imageName','image/jpeg');

|方法名|简介| |:--|:--| |insertImg(canvasId,elementId,quality)|转化为<img>并插入到指定结点中。| |download(canvasId,fileName,type)|以图片格式下载<canvas>。|

insertImg(canvasId,elementId,quality)

<canvas/>转化为<img/>插入到指定结点中。

参数

  • canvasId

被操作的canvas的id

  • elementId

需要插入所转化<img/>的id

  • quality (可选)

图片质量,仅供在'image/jpeg'类型时使用

download(canvasId,fileName,type)

<canvas/>转化为img下载到本地。

参数

  • canvasId

被操作的canvas的id

  • fileName (可选)

下载到本地到图片文件。默认名image.png

  • type (可选)

图片类型。默认image/png,可选image/jpegimage/webp(webp仅在谷歌浏览器可使用)

常见问题

1、为什么导出的jpeg格式的图片背景是黑色?

如果你需要导出jpeg格式的图片,请在canvas绘制之初将背景色填充成白色,否则jpeg格式的图片背景色会变成黑色。

    context.fillStyle = 'white';
    context.fillRect(0,0,ctx.canvas.width,ctx.canvas.height);

参与共建

希望你也能参与到这个js库的建设中,欢迎你的加入。

License

MIT