<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<button onclick="copyToCliper(‘复制的实际内容‘)">按钮</button></div>
<script type="text/javascript">
function copyToCliper(msg){
var Sys = {};
var ua = navigator.userAgent.toLowerCase();
var s;
(s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
(s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
(s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :
(s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
(s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;
if( Sys.ie ){
var _text = document.createElement("textarea");
_text.style.width = "1px";
_text.style.height = "1px";
_text.style.background = "transparent";
_text.style.border = "none";
_text.style.resize = "none";
_text.style.filter = "alpha(opacity=0)";
_text.textContent = msg;
document.body.appendChild(_text);
_text.select(); //选择对象
document.execCommand("Copy"); //执行浏览器复制命令
alert("已复制。");
}
else{
window.prompt("您的浏览器不支持直接复制\n请使用Ctrl+C来复制文本框内容，确认完成后点击关闭。",msg);
}
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/junxizai/p/4147871.html