禁止选择，右键菜单，拷贝，拖拽
<body onbeforecopy="return false" ondragstart="return false"
oncontextmenu="return false" oncopy=document.selection.empty()
onselectstart="return false" onselect=document.selection.empty()>
<body onbeforecopy="return false" ondragstart="return false"
oncontextmenu="return false" oncopy=document.selection.empty()
onselectstart="return false" onselect=document.selection.empty()>
