copy.js

function CopyToClipboard(option) {
    var textToClipboard = option.text
    function CreateElementForExecCommand (textToClipboard) {
        var forExecElement = document.createElement ("div");
            // place outside the visible area
        forExecElement.style.position = "absolute";
        forExecElement.style.left = "-10000px";
        forExecElement.style.top = "-10000px";
            // write the necessary text into the element and append to the document
        forExecElement.textContent = textToClipboard;
        document.body.appendChild (forExecElement);
            // the contentEditable mode is necessary for the  execCommand method in Firefox
        forExecElement.contentEditable = true;
        
        return forExecElement;
    }
    function SelectContent (element) {
        // first create a range
        var rangeToSelect = document.createRange ();
        rangeToSelect.selectNodeContents (element);
        
            // select the contents
        var selection = window.getSelection ();
        selection.removeAllRanges ();
        selection.addRange (rangeToSelect);
    }
            
    var success = true;
    // Internet Explorer
    if (window.clipboardData) {

        window.clipboardData.setData("Text", textToClipboard);

    }
    else {

        // create a temporary element for the execCommand method
        var forExecElement = CreateElementForExecCommand(textToClipboard);

        /* Select the contents of the element
            (the execCommand for 'copy' method works on the selection) */
        SelectContent(forExecElement);

        var supported = true;

        // UniversalXPConnect privilege is required for clipboard access in Firefox
        try {
            if (window.netscape) {
                if(netscape.security && netscape.security.PrivilegeManager && netscape.security.PrivilegeManager.enablePrivilege){
                    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
                }
            }
            // Copy the selected content to the clipboard
            // Works in Firefox and in Safari before version 5
            success = document.execCommand("copy", false, null);
        }
        catch (e) {
            success = false;
            alert("此操作被浏览器拒绝！/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'");
        }

        // remove the temporary element
        document.body.removeChild(forExecElement);

    }

    if (success) {
        option.success && option.success()
    }
    else {
        option.error && option.error()
    }
}