一段跨浏览器的"复制到剪贴板"javascript代码

    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);
    }
    }