防拷贝代码（加入BODY中即可，防止右键和CTRL+A）
<body leftmargin=0 topmargin=0 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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