实现平滑跳转到锚点效果代码,Js代码库,德仔网

代码语言
代码分类
【Js】实现平滑跳转到锚点效果
作者: / 发布于2016/6/7/ 718
javascript:

<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 [xieyanfu@yahoo.com.cn]
// 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>

调用方法：

scroller(el, duration)
el : 目标锚点 ID
duration : 持续时间，以毫秒为单位，越小越快
试试其它关键字
同语言下
可能有用的
贡献的其它代码Label