document.body.oncopy = function ()

{
 setTimeout(
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  {
   var text = clipboardData.getData("text");
   if (text)
   {
    text = text + "\r\n转载自"+location.href;
    clipboardData.setData("text", text);
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  },
  100
 )
}

window.onload = function()

{
 this.focus();
}