js菜单默认选中

function defaultSelected() {
        var curr = $("#leftTree li[onclick*='" + $("#content_iframe").attr("src") + "']");
        if (curr.size() > 0) {
            $(curr[0]).addClass("selected");
            $("#leftTree li:not([onclick*='" + $("#content_iframe").attr("src") + "'])").removeClass("selected");
        }
    }