function CopyText(id) { 
  try { 
  var targetText = document.getElementById(id); 
  targetText.focus(); 
  targetText.select(); 
  var clipeText = targetText.createTextRange(); 
  clipeText.execCommand("Copy"); 
  }
  catch(e){ } 
 } 
 document.write("复制本页与好友分享:<input value='" + document.location.href +"'"); 
 document.write(" size=100 style='BORDER: #E3E3E3 1px solid;font-family:tahoma;color:#999;'");
 document.write(" id=url onclick=CopyText(this.id);");