js复制功能

<div id="cardList">
        <div class="btn" onClick="copy(111)">点击我，复制我</div>
 </div>
<script type="text/javascript">   
        function copy(str){
            var save = function (e){
                e.clipboardData.setData('text/plain',str);
                e.preventDefault();
            }
            document.addEventListener('copy',save);
            document.execCommand("copy");
            alert("复制成功");
        }
</script>

<textarea cols="20" rows="10" id="biao1">用户定义的代码区域</textarea>
<input type="button" onClick="copyUrl2()" value="点击复制代码" />
<script type="text/javascript">
function copyUrl2()
{
var Url2=document.getElementById("biao1");
Url2.select(); // 选择对象
document.execCommand("Copy"); // 执行浏览器复制命令
alert("已复制好，可贴粘。");
}
</script>

<div cols="20" id="biao1">12345678dddd</div>
<input type="button" onClick="copyUrl2()" value="点击复制代码" />
<script type="text/javascript">
    function copyUrl2(){
            var Url2=document.getElementById("biao1").innerText;
            var oInput = document.createElement('input');
            oInput.value = Url2;
            document.body.appendChild(oInput);
            oInput.select(); 
            document.execCommand("Copy"); 
            oInput.style.display='none';
            alert('复制成功');
       }
</script>