[javascript]复制到剪切板

<!-- 一个简单的小栗子 -->
<button class="copy-link"
    data-fulllink="要被复制的内容在这里～">复制链接</button>
<!-- 空白节点，缓存数据，尽量使用下面的样式将该节点隐藏起来 -->
<div class="copy-area"></div>
<style>
.copy-area {
    position: absolute;
    z-index: -1;
    width: 0;
    height: 0;
    opacity: 0;
}
</style>
<script>
function copyLink(event) {
    let target = event.target;
    let fullLink = target.getAttribute('data-fulllink');
    // 在页面上建一个空白节点，用来缓存要被复制的数据
    let copyNode = document.querySelector('.copy-area');
    let range = document.createRange();
    let selection = window.getSelection();
    copyNode.innerHTML = fullLink;
    range.selectNode(copyNode);
    // 去除默认的选区对象
    if (selection.rangeCount > 0) {
        selection.removeAllRanges();
    }
    selection.addRange(range);
    document.execCommand('copy');
    target.innerHTML = '复制成功';
}
document.querySelector('.copy-link').onclick = copyLink;
</script>