JS复制文本到剪切板

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 1 function copyToClipboard(txt) {  
 2      if(window.clipboardData) {  
 3        window.clipboardData.clearData();  
 4        window.clipboardData.setData("Text", txt);  
 5        alert("Your request has been processed successfully.");  
 6      } else if(navigator.userAgent.indexOf("Opera") != -1) {  
 7       window.location = txt;  
 8      } else if (window.netscape) {  
 9       try {  
10        netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");  
11       } catch (e) {  
12        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'");  
13       }  
14       var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);  
15       if (!clip)  
16        return;  
17       var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);  
18       if (!trans)  
19        return;  
20       trans.addDataFlavor('text/unicode');  
21       var str = new Object();  
22       var len = 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("Your request has been processed successfully.");  
32      }  
33     }