js复制内容到剪切板代码

function copyweather(meintext) {
 if (window.clipboardData) {
  window.clipboardData.setData("Text", meintext);
 }
  else if (window.netscape) {
   netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
   var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
  if (!clip) return;
   var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
  if (!trans) return;
  trans.addDataFlavor('text/unicode');
   var str = new Object();
  var len = new Object();  
  var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);  var copytext=meintext;
  str.data=copytext;
  trans.setTransferData("text/unicode",str,copytext.length*2);
  var clipid=Components.interfaces.nsIClipboard;
  if (!clip) return false;
  clip.setData(trans,null,clipid.kGlobalClipboard);
 } 
 alert("复制成功!");
 return false;
}