通过JavaScript将base64的图片复制到剪切板，粘贴到微信的方案

Question

1. 尝试clipboard.js
2. 也尝试了以下方案

const selection = window.getSelection();

const range = document.createRange();

range.selectNodeContents(element);

selection.removeAllRanges();

selection.addRange(range);

都没有办法实现将base64图片通过js放到剪切板粘贴到微信，求哪位大神做过类似需求，是否有解决方案，多谢

Answer 1

楼主可以试试下面的方法，我在IE11和Chrome下测试是可以成功复制的

<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>