锚 点

/**
* @author Kira.Sun<[e-mail]>
* @see 用 Javascript 实现锚点(Anchor)间平滑跳转
* @param {}
*            v scroller(el, duration) el : 目标锚点 ID duration : 持续时间，以毫秒为单位，越小越快
* @return {}
* @version 2009-10-10
*/
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
};
34.
}
// 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);
}






jsp
<a href="javascript:scroller('${curPagePlece.englishName}', 800);" >锚</a>




方法二
// 锚点平滑移动
function scroller(tag){
var Duration=500;
if(!tag){
var El = document.getElementsByTagName("body");
El = El.length >= 2 ? El : (El.length == 1 ? El[0] : undefined)
}else{
var El = document.getElementById(tag);
}
if(!El){
return;
}
var elInfo = GetPos(El);
var scroll = GetScroll();
var time = (new Date).getTime();
var timer = setInterval(function (){
var t = (new Date).getTime();
var p = (t - time) / Duration;
if (t >= Duration + time){
clearInterval(timer);
this.timer = null;
}else{
st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (elInfo.y-scroll.t) + scroll.t;
sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (elInfo.x-scroll.l) + scroll.l;
window.scrollTo(sl, st);
}
}, 13);
//

}

// 转换为数字
function Intval(a){
var v = parseInt(a);
return isNaN(v) ? 0 : v;
}
// 获取元素信息
function GetPos(e){
var offsetLeft = 0;
var offsetTop  = 0;
//offsetWidth、offsetHeight         IE工作区宽和高, IE会加上滚动条的宽度
  //clientWidth、clientHeight         IE可见区宽和高
  //scrollWidth、scrollHeight         IE水平滚动板宽度和垂直滚动板高度
var width = Intval(e.style.width);
var height = Intval(e.style.height);
var offsetWidth = e.offsetWidth;
var offsetHeight = e.offsetHeight;
while (e.offsetParent){
offsetLeft += e.offsetLeft + (e.currentStyle?Intval(e.currentStyle.borderLeftWidth):0);
offsetTop += e.offsetTop  + (e.currentStyle?Intval(e.currentStyle.borderTopWidth):0);
e = e.offsetParent;
}
offsetLeft += e.offsetLeft + (e.currentStyle?Intval(e.currentStyle.borderLeftWidth):0);
offsetTop += e.offsetTop + (e.currentStyle?Intval(e.currentStyle.borderTopWidth):0);
return {
x: offsetLeft,
y: offsetTop,
w: width,
h: height,
wb: offsetWidth,
hb: offsetHeight
};
}

//获取滚动条信息
function GetScroll(){
var scrollTop, scrollLeft, scrollWidth, scrollHeight;
if(document.documentElement && document.documentElement.scrollTop){
scrollTop = document.documentElement.scrollTop;
scrollLeft = document.documentElement.scrollLeft;
scrollWidth = document.documentElement.scrollWidth;
scrollHeight = document.documentElement.scrollHeight;
}else if(document.body){
scrollTop = document.body.scrollTop;
scrollLeft = document.body.scrollLeft;
scrollWidth = document.body.scrollWidth;
scrollHeight = document.body.scrollHeight;
}
return {
t: scrollTop,
l: scrollLeft,
w: scrollWidth,
h: scrollHeight
};
}