如何复制图片

Thomas Steiner
Thomas Steiner

许多现代浏览器都支持以 PNG 和 SVG 格式将图片复制到剪贴板。出于安全考虑,目前尚不支持其他格式。

现代风

使用 Async Clipboard API

Clipboard.write() 方法接受 ClipboardItem 对象的数组,并返回一个在图片成功写入剪贴板后进行解析的 Promise。只能从具有焦点的 window 对象中使用 Clipboard.write()

浏览器支持

  • 66
  • 79
  • 13.1

来源

经典路线

使用 navigator.clipboard.writeText()

虽然并非所有浏览器都支持对二进制数据使用 navigator.clipboard.write(),但它们都支持 navigator.clipboard.writeText()。如果要复制 SVG 图片,而不是复制图片本身,您可以复制 SVG 源代码。对于 PNG 图片,很遗憾。

浏览器支持

  • 66
  • 79
  • 63
  • 13.1

来源

渐进式增强

const button = document.querySelector('button');
const img = document.querySelector('img');

button.addEventListener('click', async () => {
  const responsePromise = fetch(img.src);
  try {
    if ('write' in navigator.clipboard) {
      await navigator.clipboard.write([
        new ClipboardItem({
          'image/svg+xml': new Promise(async (resolve) => {
            const blob = await responsePromise.then(response => response.blob());
            resolve(blob);
          }),
        }),
      ]);
      // Image copied as image.
    } else {
      const text = await responsePromise.then(response => response.text());
      await navigator.clipboard.writeText(text);
      // Image copied as source code.
    }
  } catch (err) {
    console.error(err.name, err.message);
  }
});

深入阅读

演示

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link
      rel="icon"
      href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎉</text></svg>"
    />
    <title>How to copy images</title>
  </head>
  <body>
    <h1>How to copy images</h1>
    <img src="assets/fugu.svg" alt="Fugu fish." width="128" height="128">
    <button type="button">Copy</button>
  </body>
</html>

CSS


        :root {
  color-scheme: dark light;
}

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  margin: 1rem;
  font-family: system-ui, sans-serif;
}

button {
  display: block;
}
        

JS


        const button = document.querySelector('button');
const img = document.querySelector('img');

button.addEventListener('click', async () => {
  const responsePromise = fetch(img.src);

  try {
    if ('write' in navigator.clipboard) {
      await navigator.clipboard.write([
        new ClipboardItem({
          'image/svg+xml': new Promise(async (resolve) => {
            const blob = await responsePromise.then(response => response.blob());
            resolve(blob);
          }),
        }),
      ]);
      // Image copied as image.
    } else {
      const text = await responsePromise.then(response => response.text());
      await navigator.clipboard.writeText(text);
      // Image copied as source code.
    }
  } catch (err) {
    console.error(err.name, err.message);
  }
});