update ScrollSpyNav; update dropdown demo

CHANGELOG.md

@@ -38,6 +38,10 @@ __Sticky__：
 - `NEW` 增加 `media` 选项，可以设置 Media Query；
 - `NEW` 增加 `bottom` 选项。
 
+__ScrollSpyNav__:
+
+- `FIXED` 链接点击失效问题。
+
 __Popover__：
 
 - `IMPROVED` 每次打开时重新计算弹出层的位置，减少位置偏移问题；

docs/javascript/dropdown.md

@@ -193,17 +193,25 @@
   $(function() {
     var $dropdown = $('#doc-dropdown-js'),
         data = $dropdown.data('amui.dropdown');
+
+    function scrollToDropdown() {
+      $(window).smoothScroll({position: $dropdown.offset().top});
+    }
+
     $('#doc-dropdown-toggle').on('click', function(e) {
+      scrollToDropdown();
       $dropdown.dropdown('toggle');
       return false;
     });
 
     $('#doc-dropdown-open').on('click', function(e) {
+      scrollToDropdown();
       data.active ? alert('已经打开了，施主又何必再纠缠呢！') : $dropdown.dropdown('open');
       return false;
     });
 
     $('#doc-dropdown-close').on('click', function(e) {
+      scrollToDropdown();
       data.active ? $dropdown.dropdown('close') : alert('没有开哪有关，没有失哪有得！');
       return false;
     });

js/ui.scrollspynav.js

 define(function(require, exports, module) {
 
-    'use strict';
-
     require('core');
+    require('ui.smooth-scroll');
 
     var $ = window.Zepto,
         UI = $.AMUI;
@@ -33,7 +32,7 @@ define(function(require, exports, module) {
         this.$window = $(window).on('scroll.scrollspynav.amui', processRAF)
             .on('resize.scrollspynav.amui orientationchange.scrollspynav.amui', UI.utils.debounce(processRAF, 50));
 
-       processRAF();
+        processRAF();
         this.scrollProcess();
     };
 
@@ -91,18 +90,15 @@ define(function(require, exports, module) {
         // smoothScroll
 
         if (this.options.smooth) {
-            require.async(['ui.smooth-scroll'], function() {
-                $links.on('click', function(e) {
-                    e.preventDefault();
+            $links.on('click', function(e) {
+                e.preventDefault();
 
-                    var $this = $(this),
-                        target = $this.attr('href'),
-                        position = $this.data('am.smoothScroll');
+                var $this = $(this),
+                    $target = $($this.attr('href'));
 
-                    !position && $this.data('am.smoothScroll', (position = $(target).offset().top));
+                if (!$target) return;
 
-                    $(window).smoothScroll(position);
-                });
+                $(window).smoothScroll({position: $target.offset().top});
             });
         }
     };