火狐,chrome和IE都支持的复制剪切板功能window.clipboardData.setData

1. function copyToClipboard(txt) {  
2.     if (window.clipboardData) {  
3.         window.clipboardData.clearData();  
4.         window.clipboardData.setData("Text", txt);  
5.         alert("<strong>复制</strong>成功！")  
6.     } else if (navigator.userAgent.indexOf("Opera") != -1) {  
7.         window.location = txt;  
8.         alert("<strong>复制</strong>成功！");  
9.     } else if (window.netscape) {  
10.         try {  
11.             netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");  
12.         } catch (e) {  
13.             alert("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'");  
14.         }  
15.         var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);  
16.         if (!clip)  
17.             return;  
18.         var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);  
19.         if (!trans)  
20.             return;  
21.         trans.addDataFlavor('text/unicode');  
22.         var str = new Object();  
23.         var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);  
24.         var copytext = txt;  
25.         str.data = copytext;  
26.         trans.setTransferData("text/unicode", str, copytext.length * 2);  
27.         var clipid = Components.interfaces.nsIClipboard;  
28.         if (!clip)  
29.             return false;  
30.         clip.setData(trans, null, clipid.kGlobalClipboard);  
31.         alert("<strong>复制</strong>成功！")  
32.     }else if(copy){  
33.         copy(txt);  
34.         alert("<strong>复制</strong>成功！")  
35.     }  
36. }