<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(); // 选择对象
  document.execmand("Copy"); // 执行浏览器复制命令
  oInput.className = 'oInput';
  oInput.style.display='none';
  alert('复制成功');
  }
</script>
<div cols="20" id="biao1">12345678</div>
<input type="button" onClick="copyUrl2()" value="" />