在知乎复制的文本为什么会自带一些版权声明，这个功能是如何实现的?
比如说我复制的
123456
最后出现的是
著作权归作者所有。
商业转载请联系作者获得授权，非商业转载请注明出处。
作者：stevenliuyi
链接：http://www.zhihu.com/question/20451870/answer/15168034
来源：知乎
123456
回复内容：
比如说我复制的
123456
最后出现的是
著作权归作者所有。
商业转载请联系作者获得授权，非商业转载请注明出处。
作者：stevenliuyi
链接：http://www.zhihu.com/question/20451870/answer/15168034
来源：知乎
123456
大体思路：
答案区域监听
copy事件，并阻止这个事件的默认行为。获取选中的内容（
window.getSelection()）加上版权信息，然后设置到剪切板（clipboardData.setData()）。
下面的代码实现了一个简单的DEMO
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
</head>
<body>
<div id="answer">测试数据<b>test</b></div>
<script>
function setClipboardText(event){
event.preventDefault();
var node = document.createElement('div');
//对documentfragment不熟，不知道怎么获取里面的内容，用了一个比较笨的方式
node.appendChild(window.getSelection().getRangeAt(0).cloneContents());
var htmlData = '<div>著作权归作者所有。<br />'
+ '商业转载请联系作者获得授权，非商业转载请注明出处。<br />'
+ '作者：tiantian<br />链接：http://segmentfault.com/u/tiantian_<br />'
+ '来源：segmentfault<br /><br />'
+ node.innerHTML
+ '</div>';
var textData = '著作权归作者所有。\n'
+ '商业转载请联系作者获得授权，非商业转载请注明出处。\n'
+ '作者：tiantian\n链接：http://segmentfault.com/u/tiantian_\n'
+ '来源：segmentfault\n\n'
+ window.getSelection().getRangeAt(0);
if(event.clipboardData){
event.clipboardData.setData("text/html", htmlData);
event.clipboardData.setData("text/plain",textData);
}
else if(window.clipboardData){
return window.clipboardData.setData("text", textData);
}
};
var answer = document.getElementById("answer");
answer.addEventListener('copy',function(e){
setClipboardText(e);
});
</script>
</body>
</html>看了知乎的代码，大致也是这么实现的，但是还加入了一些其他的判断，比如如果答案设置了不能复制，则阻止copy事件，并显示提示信息，如果复制的文本长度小于42的话，不会加上版权信息。
copy事件可以参考：
https://developer.mozilla.org/zh-CN/docs/Web/API/HTMLElement/oncopy
http://codebits.glennjones.net/editing/setclipboarddata.htm
没有这个问题啊
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