JavaScript FireFox savaAS

预览器另存为,查了很多都是 exeCommand 方法，它之有IE才有这个方法，找个一个火狐下的代码，与大家分享一下:

var priv1 = "UniversalXPConnect";
var priv2 = "UniversalFileRead";
var privilegeGranted = true;
var runtimeError = '';

function ffSaveAS() {
try {
netscape.security.PrivilegeManager.enablePrivilege (priv1);
netscape.security.PrivilegeManager.enablePrivilege (priv2);
if (privilegeGranted) {
var nsIFilePicker = Components.interfaces.nsIFilePicker;
}

}catch(e) {
privilegeGranted = false;
runtimeError = "Extended privileges are not granted by user";
}
finally {
/*NOP*/
}
var fp =
Components.classes['@mozilla.org/filepicker;1'].createInstance(nsIFilePicker);
fp.init(window, "Save As", nsIFilePicker.modeSave);

    fp.defaultString = "showRegInfo";
    fp.appendFilter("htm", "*.htm");
    var rv = fp.show();
    if (rv == nsIFilePicker.returnOK || rv == nsIFilePicker.returnReplace) {
      var file = fp.file;
      var path = fp.file.path;
var persist = Components.classes['@mozilla.org/embedding/browser/nsWebBrowserPersist;1'].createInstance(Components.interfaces.nsIWebBrowserPersist);
    var ios = Components.classes['@mozilla.org/network/io-service;1'].getService(Components.interfaces.nsIIOService); 
    var uri = ios.newURI(location.href, null, null);
    var target = ios.newFileURI(file)
    var xfer = Components.classes["@mozilla.org/transfer;1"] .createInstance(Components.interfaces.nsITransfer);
    xfer.init(uri, target, "", null, null, null, persist); 
    persist.progressListener = xfer;
    persist.saveURI(uri, null, null, null, null, file);
    }
}