对于非ie浏览器他是用flash来实现的，js代码如下：
复制代码 代码如下:
<script type="text/javascript">
function copy_code(copyText)
{
if (window.clipboardData)
{
window.clipboardData.setData("Text", copyText)
}
else
{
var flashcopier = 'flashcopier';
if(!document.getElementById(flashcopier))
{
var divholder = document.createElement('div');
divholder.id = flashcopier;
document.body.appendChild(divholder);
}
document.getElementById(flashcopier).innerHTML = '';
var divinfo = '<embed src="/UploadFiles/2021-04-02/_clipboard.swf">document.getElementById(flashcopier).innerHTML = divinfo;
}
alert('copy成功！');
}
</script>
<input id="inputTest" type="button" value="测试" onclick="copy_code('拷贝成功！')" />

那个flash文件从这里下载：下载