Posted in Javascript onSeptember 08, 2009
锚点(Anchor)相信很多人都不陌生,它方便访问者在页面的不同位置快速跳转,直接找到自己感兴趣的内容,如果说 RSS 是整个网站的摘要,那锚点就是一个页面的摘要,通常一个页面内容很多的时候,都会用锚点来定位。
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。
<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] // 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>
调用方式:
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:
<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>
测试代码:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=gb2312" /> <meta name="keywords" content="平滑, 锚点, Anchor, 跳转, 滚动, javascript, " /> <meta name="description" content="锚点(Anchor)相信很多人都不陌生,它方便访问者在页面的不同位置快速跳转,直接找到自己感兴趣的内容,如果说 RSS 是整个网站的摘要,那锚点就是一个页面的摘要,通常一个页面内容很多的时候,都会用锚点来定位。" /> <title>用 Javascript 实现锚点(Anchor)间平滑跳转 - 平滑, 锚点, Anchor, 跳转, 滚动, javascript, </title> <link rel="stylesheet" href="/admin/tpl/default/css/pub_example.css" type="text/css" /> </head> <body> <div class="ad"> </div> <br /> <div id="example"> <h3 id="example_title">用 Javascript 实现锚点(Anchor)间平滑跳转</h3> <div id="example_main"> <!--************************************* 实例代码开始 *************************************--> <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] // 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> <!--************************************* 实例代码结束 *************************************--> </div> <div id="back"><a href="https://3water.com">返回 首页</a></div> </div> <br /> <div class="ad"> </div> </body> </html>
用Javascript实现锚点(Anchor)间平滑跳转
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