SOURCE

		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.execCommand("Copy"); // 执行浏览器复制命令
						oInput.className = 'oInput';
						oInput.style.display='none';
						alert('复制成功');
				}

<div cols="20" id="biao1">123213213</div>
<input type="button" onClick="copyUrl2()" value="点击复制代码" />