用 Javascript实现锚点平滑移动.呵呵.刚刚发现一篇js文章,写的不错,偷过来收藏一下

js 代码

<script type="text/javascript">  // 说明 ：用 Javascript 实现锚点(Anchor)间平滑跳转 // 来源 ：ThickBox 2.1 // 整理 ：Yanfu Xie [[e-mail]] // 网址 ：http://www.codebit.cn // 日期 ：07.01.17  // 转换为数字 function intval(v) {     v = parseInt(v);     return isNaN(v) ? 0 : v; }  // 获取元素信息 function getPos(e) {     var l = 0;     var t  = 0;     var w = intval(e.style.width);     var h = intval(e.style.height);     var wb = e.offsetWidth;     var hb = e.offsetHeight;     while (e.offsetParent){         l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);         t += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);         e = e.offsetParent;     }     l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);     t  += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);     return {x:l, y:t, w:w, h:h, wb:wb, hb:hb}; }  // 获取滚动条信息 function getScroll()  {     var t, l, w, h;          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 }; }  // 锚点(Anchor)间平滑跳转 function scroller(el, duration) {     if(typeof el != 'object') { el = document.getElementById(el); }      if(!el) return;      var z = this;     z.el = el;     z.p = getPos(el);     z.s = getScroll();     z.clear = function(){window.clearInterval(z.timer);z.timer=null};     z.t=(new Date).getTime();      z.step = function(){         var t = (new Date).getTime();         var p = (t - z.t) / duration;         if (t >= duration + z.t) {             z.clear();             window.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 = window.setInterval(function(){z.step();},13); }  </script>

    <style type="text/css">
    div.test {
        width:400px;
        margin:5px auto;
        border:1px solid #ccc;
    }
    div.test strong {
        font-size:16px;
        background:#fff;
        border-bottom:1px solid #aaa;
        margin:0;
        display:block;
        padding:5px 0;
        text-decoration:underline;
        color:#059B9A;
        cursor:pointer;
    }
    div.test p {
        height:400px;
        background:#f1f1f1;
        margin:0;
    }

    </style>

    <div class="test">
        <a name="header_1" id="header_1"></a>
        <strong onclick="javascript:scroller('header_4', 800);">header_1 --> header_4</strong>
        <p></p>
    </div>

    <div class="test">
        <a name="header_2" id="header_2"></a>
        <strong onclick="javascript:scroller('header_5', 800);">header_2 --> header_5</strong>
        <p></p>
    </div>

    <div class="test">
        <a name="header_3" id="header_3"></a>
        <strong onclick="javascript:scroller('header_6', 800);">header_3 --> header_6</strong>
        <p></p>
    </div>

    <div class="test">
        <a name="header_4" id="header_4"></a>
        <strong onclick="javascript:scroller('header_7', 800);">header_4 --> header_7</strong>
        <p></p>
    </div>

    <div class="test">
        <a name="header_5" id="header_5"></a>
        <strong onclick="javascript:scroller('header_3', 800);">header_5 --> header_3</strong>
        <p></p>
    </div>

    <div class="test">
        <a name="header_6" id="header_6"></a>
        <strong onclick="javascript:scroller('header_2', 800);">header_6 --> header_2</strong>
        <p></p>
    </div>

    <div class="test">
        <a name="header_7" id="header_7"></a>
        <strong onclick="javascript:scroller('header_1', 800);">header_7 --> header_1</strong>
        <p></p>
    </div>