JavaScript实现“复制到剪贴板”功能

copythclipboard.js

copyToClipboard = function(txt) { 
if(window.clipboardData) { 
   window.clipboardData.clearData(); 
   window.clipboardData.setData(”Text”, txt); 
} else if(navigator.userAgent.indexOf(”Opera”) != -1) { 
window.location = txt; 
} else if (window.netscape) { 
try { 
netscape.security.PrivilegeManager.enablePrivilege(”UniversalXPConnect”); 
} catch (e) { 
alert(”您的firefox安全限制限制您进行剪贴板操作，请打开'about:config'将signed.applets.codebase_principal_support'设置为true'之后重试”); 
return false; 
} 
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 = txt; 
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); 
} 
}