ListBox实现上移,下移,左移,右移的简单实例(3)

function changepos(obj, index) {
            if (index == -1) {
                if (obj.selectedIndex > 0) {
                    obj.options(obj.selectedIndex).swapNode(obj.options(obj.selectedIndex - 1))
                }
            }
            else if (index == 1) {
                if (obj.selectedIndex < obj.options.length - 1) {
                    obj.options(obj.selectedIndex).swapNode(obj.options(obj.selectedIndex + 1))
                }
            }
        }
    //-->
    </script>
</body>
</html>

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