原生js实现基于base64数据复制图片到剪切板，可以粘贴出图片，模拟浏览器复制功能。
之前我们这边有个需求就是说，前端通过canvas截图然后， 点击一个按钮实现复制截取的图片到剪切板上，然后我查了好多文档，还去了github上看了一圈也没看见比较好的解决方案。
不说废话了直接上代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js复制图片-文字</title>
</head>
<body>
<div>
<img id="hidImag" src="" />
</div>
<input id="copy" type="button" style="cursor: pointer;" value="复制图片到剪切板">
<script type="text/javascript">
copy.onclick = function () {
try {
const base64Data = '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'
if (document.body.createControlRange) { //IE 11 需要有个img标签
var controlRange;
var imgs = document.getElementById('hidImag');
imgs.onload = function () {
controlRange = document.body.createControlRange();
imgs.contentEditable = 'true';
controlRange.addElement(imgs);
try {
var successful = controlRange.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
console.log('Copying text command was ' + msg);
} catch (err) {
console.log(err);
}
}
imgs.src = 'data:image/png;base64,' + base64Data;
}
else { //chrome
const blobInput = convertBase64ToBlob(base64Data, 'image/png');
const clipboardItemInput = new ClipboardItem({ 'image/png': blobInput });
navigator.clipboard.write([clipboardItemInput]);
console.log('success');
}
} catch (e) {
console.log(e);
}
}
function convertBase64ToBlob(base64, type) {
var bytes = window.atob(base64);
var ab = new ArrayBuffer(bytes.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < bytes.length; i++) {
ia[i] = bytes.charCodeAt(i);
}
return new Blob([ab], { type: type });
}
</script>
</body>
</html>来自:https://segmentfault.com/a/1190000038507601
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