重写confirm()

        function confirm(message, callback){
            var create = function(){
                return document.createElement.apply(document, arguments);
            }
            var    dialog = create("div"),
                messageBox = create("p"),
                okBubbton = create("button"),
                cancelButton = create("button");
            dialog.style.cssText = "position: absolute; top: 200px; left: 600px; width: 200px; height: 150px; border: 1px solid gray;";
            messageBox.innerHTML = message;
            okBubbton.innerHTML = "OK";
            cancelButton.innerHTML = "Cancel";
            okBubbton.onclick = function(){
                callback(true);
                dialog.parentNode.removeChild(dialog);
            }
            cancelButton.onclick = function(){
                callback(false);
                dialog.parentNode.removeChild(dialog);
            }
            dialog.appendChild(messageBox);
            dialog.appendChild(okBubbton);
            dialog.appendChild(cancelButton);
            document.body.appendChild(dialog);
        }
        function confirmListener(result){
            alert(result);
        }
        confirm("confirm test", confirmListener);