复制任意元素内容

使用了 Selection, Range 等 API 实现：

function selectElementContents(el) {
    var body = document.body, range, sel;
    if (document.createRange && window.getSelection) {
        range = document.createRange();
        sel = window.getSelection();
        sel.removeAllRanges();
        try {
            range.selectNodeContents(el);
            sel.addRange(range);
        } catch (e) {
            range.selectNode(el);
            sel.addRange(range);
        }
        document.execCommand("copy");
    } else if (body.createTextRange) {
        range = body.createTextRange();
        range.moveToElementText(el);
        range.select();
        range.execCommand("Copy");
    }
}

代码源地址：点这里

复制一段文本

复制一段文本到剪切板中:

function copyToClipboard(text) {
    var textarea = document.createElement('textarea');
    textarea.innerHTML = text;
    document.body.appendChild(textarea);
    textarea.select();
    document.execCommand('copy');
    textarea.remove();
}