[jquery选择器]基于jquery返回顶部程序代码

【www.bbyears.com--jquery】

<script type=text/javascript src="js/jquery.js"></script>
<script type=text/javascript>
(function() {
    var $backToTopTxt = "fdsfds", $backToTopEle = $("").appendTo($("body"))
        .text($backToTopTxt).attr("title", $backToTopTxt).click(function() {
            $("html, body").animate({ scrollTop: 0 }, 120);
    }), $backToTopFun = function() {
        var st = $(document).scrollTop(), winh = $(window).height();
        (st > 0)? $backToTopEle.show(): $backToTopEle.hide();   
        //IE6下的定位
        if (!window.XMLHttpRequest) {
            $backToTopEle.css("top", st + winh - 166);   
        }
    };
    $(window).bind("scroll", $backToTopFun);
    $(function() { $backToTopFun(); });
})();
</script>

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