html 锚点三种实现方法

在网页中经常用到锚点,特别是在比较长的页面中锚点的使用会增加用户体验,现在php中文网介绍html 锚点三种实现方法

1. 在同一页面中


跳转到add
2. 在不同页面中,锚点定位在a.html中,从另外一个页面的链接跳转到这个锚点
跳转到a.add
3. 点击链接触发js事件,同时跳转到锚点,有两种处理方式:
第一种:
触发add函数并跳转到add锚点
第二种:


通过scrollIntoView实现锚点效果 

在html中设置锚点定位有几种方法,使用id定位、使用name定位、使用js定位,这些方法不一定是最全的,只可以参考下

1、使用id定位: 

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< a  href = "#1F"  name = "1F" >锚点1 a >
< p  name = "1F" >
< p >
11111111111
br >
11111111111
br >11111111111
br >11111111111
br >11111111111
br >
p >
p >

这样的定位可以针对任何标签来定位。 

2、使用name定位:

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< a  href = "#5F" >锚点5 a >
br > br > br > br > br > br > br > br > br > br > br > br > br > br > br > br > br > br > br >
< a  name = "5F" >1111111 href >

使用name属性只能针对a标签来定位,而对p等其他标签就不能起到定位作用。 

3、使用js定位

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< li  class = ""  onclick = "javascript:document.getElementById('here').scrollIntoView()" > li >

实例:

js 锚点平滑定位

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     < head >
         < style  type = "text/css"  mce_bogus = "1" >
             p.test {
                 width: 400px;
                 margin: 5px auto;
                 border: 1px solid #ccc;
             }
              
             p.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;
             }
              
             p.test p {
                 height: 400px;
                 background: #f1f1f1;
                 margin: 0;
             }
         style >
         < script  type = "text/javascript" >
              
             function intval(v){
                 v = parseInt(v);
                 return isNaN(v) ? 0 : v;
             } // ?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
                 };
             } // ?取??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
                 };
             } // ?点(Anchor)?平滑跳?  
             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 >
     head >
     < body >
         < p  class = "test" >
             < a  name = "header_1"  id = "header_1" > a >
             < strong  onclick = "javascript:scroller('header_4', 800);" >header_1 --> header_4 strong >
             < p >
             p >
         p >
         < p  class = "test" >
             < a  name = "header_2"  id = "header_2" > a >
             < strong  onclick = "javascript:scroller('header_5', 800);" >header_2 --> header_5 strong >
             < p >
             p >
         p >
         < p  class = "test" >
             < a  name = "header_3"  id = "header_3" > a >
             < strong  onclick = "javascript:scroller('header_6', 800);" >header_3 --> header_6 strong >
             < p >
             p >
         p >
         < p  class = "test" >
             < a  name = "header_4"  id = "header_4" > a >
             < strong  onclick = "javascript:scroller('header_7', 800);" >header_4 --> header_7 strong >
             < p >
             p >
         p >
         < p  class = "test" >
             < a  name = "header_5"  id = "header_5" > a >
             < strong  onclick = "javascript:scroller('header_3', 800);" >header_5 --> header_3 strong >
             < p >
             p >
         p >
         < p  class = "test" >
             < a  name = "header_6"  id = "header_6" > a >
             < strong  onclick = "javascript:scroller('header_2', 800);" >header_6 --> header_2 strong >
             < p >
             p >
         p >
         < p  class = "test" >
             < a  name = "header_7"  id = "header_7" > a >
             < strong  onclick = "javascript:scroller('header_1', 800);" >header_7 --> header_1 strong >
             < p >
             p >
         p >
     body >
html >

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