网页禁止复制，鼠标右键，鼠标左键，选择等
<body runat="server" style="width: 600px; height: 500px" oncontextmenu="return false" ondragstart="return false" onselectstart ="return false" onselect="document.selection.empty()" oncopy="document.selection.empty()" onbeforecopy="return false" onmouseup="document.selection.empty()">
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