JS复制到剪贴板示例代码

/* 
* 复制到剪贴板 
* 
* */ function copyToClipboard(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) { 
showAlert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将'signed.applets.codebase_principal_support'设置为'true'"); 
} 
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); 
showMessage("复制成功！"); 
}else if(window.navigator.userAgent.indexOf("Chrome") !== -1 ){ 
var dialog = $("#sanwn_clipboardDialog"); 
if(dialog.length==0){ 
var text = "<div id='xxx_clipboardDialog' title='请按Ctrl+C复制内容到剪贴板'><input type='text' id='sanwn_clipboardTxt' value='"+txt+"'></div>"; 
$("body").append( $(text)); 
$("#sanwn_clipboardDialog").omDialog({ 
autoOpen: false, 
height: 140, 
modal: true 
}); 
dialog =$( "#sanwn_clipboardDialog"); 
} 
$("#sanwn_clipboardTxt").val(txt); 
$("#sanwn_clipboardDialog").omDialog("open"); 
document.getElementById("sanwn_clipboardTxt").select(); 
} 
}