用Javascript实现锚点(Anchor)间平滑跳转_javascript技巧

但是锚点也有个问题，通常点击锚点后，页面会立即跳到目标位置，而本文介绍的方法，实现了锚点(Anchor)间平滑跳转，效果非常不错。
代码如下:

// 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]
// 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);
}

调用方式：
代码如下:
scroller(el, duration)
el : 目标锚点 ID
duration : 持续时间，以毫秒为单位，越小越快

HTML:
代码如下:



header_1 --> header_4




header_2 --> header_5




header_3 --> header_6




header_4 --> header_7




header_5 --> header_3




header_6 --> header_2




header_7 --> header_1



测试代码：
代码如下:

用 Javascript 实现锚点(Anchor)间平滑跳转

// 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]
// 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);
}

header_1 --> header_4

header_2 --> header_5

header_3 --> header_6

header_4 --> header_7

header_5 --> header_3

header_6 --> header_2

header_7 --> header_1

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