这就是我所做的。

注意:请检查App.js的代码。

链接到源代码

如果你喜欢它，你可以掉一颗星。✌️

更新:

import * as htmlToImage from 'html-to-image';
import download from 'downloadjs';

import logo from './logo.svg';
import './App.css';

const App = () => {
  const onButtonClick = () => {
    var domElement = document.getElementById('my-node');
    htmlToImage.toJpeg(domElement)
      .then(function (dataUrl) {
        console.log(dataUrl);
        download(dataUrl, 'image.jpeg');
      })
      .catch(function (error) {
        console.error('oops, something went wrong!', error);
      });
  };
  return (
    <div className="App" id="my-node">
      <header className="App-header">
        <img src={logo} className="App-logo" alt="logo" />
        <p>
          Edit <code>src/App.js</code> and save to reload.
        </p>
        <a
          className="App-link"
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
        >
          Learn React
        </a><br></br>
        <button onClick={onButtonClick}>Download as JPEG</button>
      </header>
    </div>
  );
}

export default App;

安装幻影

$ npm install phantomjs

用以下代码创建一个文件github.js

var page = require('webpage').create();
//viewportSize being the actual size of the headless browser
page.viewportSize = { width: 1024, height: 768 };
page.open('http://github.com/', function() {
    page.render('github.png');
    phantom.exit();
});

将文件作为参数传递给phantomjs

$ phantomjs github.js

这里所有的答案都使用第三方库，而在纯Javascript中将HTML渲染为图像可以相对简单。在MDN的画布部分甚至有一篇关于它的文章。

诀窍是这样的:

使用包含XHTML的foreignObject节点创建SVG 将图像的src设置为该SVG的数据url 将图像绘制到画布上 将画布数据设置为目标image.src

const {body} = document const canvas = document.createElement('canvas') const ctx = canvas.getContext('2d') canvas.width = canvas.height = 100 const tempImg = document.createElement('img') tempImg.addEventListener('load', onTempImageLoad) tempImg.src = 'data:image/svg+xml,' + encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><foreignObject width="100%" height="100%"><div xmlns="http://www.w3.org/1999/xhtml"><style>em{color:red;}</style><em>I</em> lick <span>cheese</span></div></foreignObject></svg>') const targetImg = document.createElement('img') body.appendChild(targetImg) function onTempImageLoad(e){ ctx.drawImage(e.target, 0, 0) targetImg.src = canvas.toDataURL() }

需要注意的一些事情

The HTML inside the SVG has to be XHTML For security reasons the SVG as data url of an image acts as an isolated CSS scope for the HTML since no external sources can be loaded. So a Google font for instance has to be inlined using a tool like this one. Even when the HTML inside the SVG exceeds the size of the image it wil draw onto the canvas correctly. But the actual height cannot be measured from that image. A fixed height solution will work just fine but dynamic height will require a bit more work. The best is to render the SVG data into an iframe (for isolated CSS scope) and use the resulting size for the canvas.

请允许我推荐dom-to-image库，这是专门用来解决这个问题的(我是维护者)。 下面是你如何使用它(更多):

var node = document.getElementById('my-node');

domtoimage.toPng(node)
    .then (function (dataUrl) {
        var img = new Image();
        img.src = dataUrl;
        document.appendChild(img);
    })
    .catch(function (error) {
        console.error('oops, something went wrong!', error);
    });

使用剧作家的page.screen()可以非常容易地截取屏幕截图。例如使用Python(但它也适用于Node.js, Java和.NET):

from playwright.async_api import async_playwright

async with async_playwright() as p:
     browser = await p.chromium.launch()
     page = await browser.new_page()
     await page.goto('https://google.com')
     await page.screenshot(path=f'screenshot.png')
     await browser.close()

我不认为这是最好的答案，但它似乎很有趣，可以发布。

编写一个应用程序，打开您最喜欢的浏览器到所需的HTML文档，适当大小的窗口，并采取屏幕截图。然后，删除图像的边界。