js实现平滑跳转到锚点(Anchor)
<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> scroller(el, duration) el:目标锚点 ID duration:持续时间,以毫秒为单位,越小越快