scrollspy.js--bug

/**
* 20140505 14.33 ycx
* scrollspy.js中存在的bug！！！---为什么ui.tabs必须在scrollspy.js中的window.onload之前执行，也就是必须在scrollspy初始化之前执行
* 1 scrollspy中的process函数中的scrollTop数值在tabs组件之后的都存在计算错误，是因为scrollspy初始化后，已经计算好整个页面的scrollTop等数组(offsets)，而这时候ui.tabs进行初始化，
* 就会把tab页的其他暂时不显示出来的内容都隐藏起来，就会导致整个页面的scrollTop等方面的数值改变了，所以在tab之后的组件都会在scrollspy中存在偏差！！
* 针对这种情况，临时的解决方法是：
* 方法一： 将ui.tabs()在scrollspy初始化之前执行--如将ui.tabs()放到document.ready回调函数中执行(因为scrollspy是在window.onload回调函数执行的)
* 方法二： 将scrollspy初始化的函数拿出来，在ui.tabs()执行之后再开始初始化。
*
* 2 也就是说，如果其他组件或者js脚本会改变页面的scrollTop等方面的内容，那么估计都要采用上述两种方法来解决。
*/

1 ui.js---是我自己写的组件库

2 scrollspy.js可在bootstrap官网下载单独的源文件

scrollspy.js代码，具体如下所示：

 /* ========================================================================
  * Bootstrap: scrollspy.js v3.0.3
  * http://getbootstrap.com/javascript/#scrollspy
  * ========================================================================
  * Copyright 2013 Twitter, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  * ======================================================================== */
 + function($) {"use strict";

     // SCROLLSPY CLASS DEFINITION
     // ==========================

     function ScrollSpy(element, options) {
         var href
         var process = $.proxy(this.process, this)

         this.$element = $(element).is('body') ? $(window) : $(element)
         this.$body = $('body')
         this.$scrollElement = this.$element.on('scroll.bs.scroll-spy.data-api', process)
         //console.log(this.$scrollElement);
         this.options = $.extend({}, ScrollSpy.DEFAULTS, options)
         this.selector = (this.options.target || (( href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, ''))//strip for ie7
         || '') + ' .nav li > a'
         //console.log(this.selector);
         this.offsets = $([])
         this.targets = $([])
         this.activeTarget = null

         this.refresh()
         this.process()
     }

     ScrollSpy.DEFAULTS = {
         offset : 10
     }

     ScrollSpy.prototype.refresh = function() {
         var offsetMethod = this.$element[0] == window ? 'offset' : 'position'
         //console.log(offsetMethod,11);

         this.offsets = $([])
         this.targets = $([])

         var self = this
         var $targets = this.$body.find(this.selector).map(function() {
             var $el = $(this)
             var href = $el.data('target') || $el.attr('href')
             var $href = /^#\w/.test(href) && $(href)
             //console.log($el,"--",href,"--",$href);
             console.log($href[offsetMethod]().top, "-------", $href[0].offsetTop, $href[0].id);
             //console.log($href,$href["offset"]().top,"-----------");

             return ($href && $href.length && [[$href[offsetMethod]().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href]]) || null
         }).sort(function(a, b) {
             return a[0] - b[0]
         }).each(function() {
             //console.log(this);
             self.offsets.push(this[0])
             self.targets.push(this[1])
         })
     }

     ScrollSpy.prototype.process = function() {
         //这里存在问题--scrollTop
         var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
         console.log("scrollTop--->>>" + scrollTop);
         var scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight
         var maxScroll = scrollHeight - this.$scrollElement.height()
         var offsets = this.offsets
         //console.log(offsets);
         var targets = this.targets
         var activeTarget = this.activeTarget
         var i

         if (scrollTop >= maxScroll) {
             return activeTarget != ( i = targets.last()[0]) && this.activate(i)
         }

         //console.log(scrollTop,offsets,)

         for ( i = offsets.length; i--; ) {
             //activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate(targets[i])

             //activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate(targets[i+1])
             activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate(targets[i])
         }
     }

     ScrollSpy.prototype.activate = function(target) {
         console.log("target===>>>", target);
         this.activeTarget = target;

         $(this.selector).parents('.active').removeClass('active')

         var selector = this.selector + '[data-target="' + target + '"],' + this.selector + '[href="' + target + '"]'

         var active = $(selector).parents('li').addClass('active')

         if (active.parent('.dropdown-menu').length) {
             active = active.closest('li.dropdown').addClass('active')
         }

         active.trigger('activate.bs.scrollspy')
     }
     // SCROLLSPY PLUGIN DEFINITION
     // ===========================

     var old = $.fn.scrollspy;

     $.fn.scrollspy = function(option) {
         return this.each(function() {
             var $this = $(this)
             var data = $this.data('bs.scrollspy')
             var options = typeof option == 'object' && option

             if (!data)
                 $this.data('bs.scrollspy', ( data = new ScrollSpy(this, options)))
             if ( typeof option == 'string')
                 data[option]()
         })
     }

     $.fn.scrollspy.Constructor = ScrollSpy;

     // SCROLLSPY NO CONFLICT
     // =====================

     $.fn.scrollspy.noConflict = function() {
         $.fn.scrollspy = old;
         return this;
     }
     // SCROLLSPY DATA-API
     // ==================

     $(window).on('load', function() {
         $('[data-spy="scroll"]').each(function() {
             var $spy = $(this);
             $spy.scrollspy($spy.data());
         })
     })
 }(jQuery);