【jquery】导航滚动到内容的特效

做页面制作也有两年了,其中也做过许多页面效果,有简单的,也有复杂的,今天就来分享一个导航滚动到内容的特效。

平时我们做导航滚动到内容都是通过锚点来做,刷的一下就直接跳到内容了,没有一丝的滚动效果,而且 url 链接最后会有“小尾巴”,今天我就介绍一款 jquery 做的滚动的特效,既可以设置滚动速度,又可以在 url 链接上没有“小尾巴”。

html:

<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
    #a{height:800px;background:red;}
    #b{height:800px;background:green;}
    #c{height:800px;background:black;}
    #d{height:800px;background:yellow;}
    </style>
</head>
<body>
    <div class="link">
        <a href="javascript:;" onclick="scroll('a')">1111111111</a>
        <a href="javascript:;" onclick="scroll('b')">2222222222</a>
        <a href="javascript:;" onclick="scroll('c')">3333333333</a>
        <a href="javascript:;" onclick="scroll('d')">4444444444</a>
    </div>
    <div id="a"></div>
    <div id="b"></div>
    <div id="c"></div>
    <div id="d"></div>
</body>
</html>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="jquery.scrollto.js"></script>
<script type="text/javascript">
function scroll(id){
    $("#"+id).ScrollTo(1000);
}
</script>

jquery.scrollto.js:

jQuery.getPos = function (e)
{
    var l = 0;
    var t  = 0;
    var w = jQuery.intval(jQuery.css(e,'width'));
    var h = jQuery.intval(jQuery.css(e,'height'));
    var wb = e.offsetWidth;
    var hb = e.offsetHeight;
    while (e.offsetParent){
        l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
        t += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
        e = e.offsetParent;
    }
    l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
    t  += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
    return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
};
jQuery.getClient = function(e)
{
    if (e) {
        w = e.clientWidth;
        h = e.clientHeight;
    } else {
        w = (window.innerWidth) ? window.innerWidth : (document.documentElement && document.documentElement.clientWidth) ? document.documentElement.clientWidth : document.body.offsetWidth;
        h = (window.innerHeight) ? window.innerHeight : (document.documentElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : document.body.offsetHeight;
    }
    return {w:w,h:h};
};
jQuery.getScroll = function (e) 
{
    if (e) {
        t = e.scrollTop;
        l = e.scrollLeft;
        w = e.scrollWidth;
        h = e.scrollHeight;
    } else  {
        if (document.documentElement && document.documentElement.scrollTop) {
            t = document.documentElement.scrollTop;
            l = document.documentElement.scrollLeft;
            w = document.documentElement.scrollWidth;
            h = document.documentElement.scrollHeight;
        } else if (document.body) {
            t = document.body.scrollTop;
            l = document.body.scrollLeft;
            w = document.body.scrollWidth;
            h = document.body.scrollHeight;
        }
    }
    return { t: t, l: l, w: w, h: h };
};

jQuery.intval = function (v)
{
    v = parseInt(v);
    return isNaN(v) ? 0 : v;
};

jQuery.fn.ScrollTo = function(s) {
    o = jQuery.speed(s);
    return this.each(function(){
        new jQuery.fx.ScrollTo(this, o);
    });
};

jQuery.fx.ScrollTo = function (e, o)
{
    var z = this;
    z.o = o;
    z.e = e;
    z.p = jQuery.getPos(e);
    z.s = jQuery.getScroll();
    z.clear = function(){clearInterval(z.timer);z.timer=null};
    z.t=(new Date).getTime();
    z.step = function(){
        var t = (new Date).getTime();
        var p = (t - z.t) / z.o.duration;
        if (t >= z.o.duration+z.t) {
            z.clear();
            setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
        } else {
            st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
            sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
            z.scroll(st, sl);
        }
    };
    z.scroll = function (t, l){window.scrollTo(l, t)};
    z.timer=setInterval(function(){z.step();},13);
};

调用方法:

$(id).ScrollTo(speed);//id是跳转到内容的id;speed是滚动速度,值越大,滚动越慢
posted @ 2012-11-13 14:28  朱羽佳  阅读(2254)  评论(1编辑  收藏  举报
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