禁止复制粘贴

<!-- 禁止复制粘贴 -->
<input type="text" name='banCopyPaste' id="banCopyPaste" />
</div>
<script type="text/javascript">
var banCopyPaste = document.getElementById('banCopyPaste');
banCopyPaste.oncopy = function (){
return false;
}
banCopyPaste.onpaste = function (){    //禁止粘贴事件
return false;
}
</script>