分享 JS 代码：同一页面链接平滑跳转

发新文章了，但却不是如上篇文章所说的介绍 jQuery 判断外部链接并新窗口打开的方法。 主要是昨天看到这段代码的时候有点小兴奋，想尽快跟大家分享下，至于那篇文章就下一次再发吧！！

这篇文章的题目还真想了不少，不知道用什么词比较好。现在写出来想必大家都能理解吧，就是在同一页面内的锚链接，也就是带有 # 的链接了，能实现平滑移动到相应的位置，而不是直接跳转，效果就如同本站在文章页点击 ， 的效果一样，大家也可以点击下试下。当然此代码的强大在于不需要你做另外其它的设置，自动实现所有锚链接的效果。你可以随便 ， ，只须将对象的 ID 前面加 # 作为链接对象即可。而且可以自定义滑动的时间。

另外用了 mail to commenter 插件的博客，当有人回复时就会有一个链接链向原来的评论，而这个链接就是锚链接，这时也来个平滑移动，效果应该不错，哈哈！！

看下官方是如何描述这个 JS 的。

Changes links that link to other parts of this page to scroll smoothly to those links rather than jump to them directly, which can be a little disorienting.

怎么样，还不错吧，现在上代码，代码中作者也做了比较详细的注释：

下载:

/* Smooth scrolling
   Changes links that link to other parts of this page to scroll
   smoothly to those links rather than jump to them directly, which
   can be a little disorienting.
   sil,
   v1.0 2003-11-11
   v1.1 2005-06-16 wrap it up in an object
*/

var ss = {
  fixAllLinks: function() {
    // Get a list of all links in the page
    var allLinks = document.getElementsByTagName('a');
    // Walk through the list
    for (var i=0;i      var lnk = allLinks[i];
      if ((lnk.href && lnk.href.indexOf('#') != -1) &&
          ( (lnk.pathname == location.pathname) ||
    ('/'+lnk.pathname == location.pathname) ) &&
          (lnk.search == location.search)) {
        // If the link is internal to the page (begins in #)
        // then attach the smoothScroll function as an onclick
        // event handler
        ss.addEvent(lnk,'click',ss.smoothScroll);
      }
    }
  },

  smoothScroll: function(e) {
    // This is an event handler; get the clicked on element,
    // in a cross-browser fashion
    if (window.event) {
      target = window.event.srcElement;
    } else if (e) {
      target = e.target;
    } else return;

    // Make sure that the target is an element, not a text node
    // within an element
    if (target.nodeName.toLowerCase() != 'a') {
      target = target.parentNode;
    }
 
    // Paranoia; check this is an A tag
    if (target.nodeName.toLowerCase() != 'a') return;
 
    // Find the tag corresponding to this href
    // First strip off the hash (first character)
    anchor = target.hash.substr(1);
    // Now loop all A tags until we find one with that name
    var allLinks = document.getElementsByTagName('a');
    var destinationLink = null;
    for (var i=0;i      var lnk = allLinks[i];
      if (lnk.name && (lnk.name == anchor)) {
        destinationLink = lnk;
        break;
      }
    }
    if (!destinationLink) destinationLink = document.getElementById(anchor);

    // If we didn't find a destination, give up and let the browser do
    // its thing
    if (!destinationLink) return true;
 
    // Find the destination's position
    var destx = destinationLink.offsetLeft;
    var desty = destinationLink.offsetTop;
    var thisNode = destinationLink;
    while (thisNode.offsetParent &&
          (thisNode.offsetParent != document.body)) {
      thisNode = thisNode.offsetParent;
      destx += thisNode.offsetLeft;
      desty += thisNode.offsetTop;
    }
 
    // Stop any current scrolling
    clearInterval(ss.INTERVAL);
 
    cypos = ss.getCurrentYPos();
 
ss_stepsize = parseInt((desty-cypos)/ss.STEPS);
ss.INTERVAL =setInterval('ss.scrollWindow('+ss_stepsize+','+desty+',"'+anchor+'")',10);
 
    // And stop the actual click happening
    if (window.event) {
      window.event.cancelBubble = true;
      window.event.returnValue = false;
    }
    if (e && e.preventDefault && e.stopPropagation) {
      e.preventDefault();
      e.stopPropagation();
    }
  },

  scrollWindow: function(scramount,dest,anchor) {
    wascypos = ss.getCurrentYPos();
    isAbove = (wascypos < dest);
    window.scrollTo(0,wascypos + scramount);
    iscypos = ss.getCurrentYPos();
    isAboveNow = (iscypos < dest);
    if ((isAbove != isAboveNow) || (wascypos == iscypos)) {
      // if we've just scrolled past the destination, or
      // we haven't moved from the last scroll (i.e., we're at the
      // bottom of the page) then scroll exactly to the link
      window.scrollTo(0,dest);
      // cancel the repeating timer
      clearInterval(ss.INTERVAL);
      // and jump to the link directly so the URL's right
      location.hash = anchor;
    }
  },

  getCurrentYPos: function() {
    if (document.body && document.body.scrollTop)
      return document.body.scrollTop;
    if (document.documentElement && document.documentElement.scrollTop)
      return document.documentElement.scrollTop;
    if (window.pageYOffset)
      return window.pageYOffset;
    return 0;
  },

  addEvent: function(elm, evType, fn, useCapture) {
    // addEvent and removeEvent
    // cross-browser event handling for IE5+,  NS6 and Mozilla
    // By Scott Andrew
    if (elm.addEventListener){
      elm.addEventListener(evType, fn, useCapture);
      return true;
    } else if (elm.attachEvent){
      var r = elm.attachEvent("on"+evType, fn);
      return r;
    } else {
      alert("Handler could not be removed");
    }
  }
}

ss.STEPS = 100;  //设置滑动时间
ss.addEvent(window,"load",ss.fixAllLinks);



中午看一下如何实现的功能！
这篇文章 MS也不错的