[new feature] add List component (#682)

docs/src/WapApp.vue

@@ -7,7 +7,9 @@
       left-arrow
       @click-left="onBack"
     />
-    <router-view />
+    <keep-alive>
+      <router-view />
+    </keep-alive>
   </div>
 </template>
 

docs/src/doc.config.js

@@ -104,6 +104,10 @@ module.exports = {
                 path: '/lazyload',
                 title: 'Lazyload - 图片懒加载'
               },
+              {
+                path: '/list',
+                title: 'List - 列表'
+              },
               {
                 path: '/loading',
                 title: 'Loading - 加载'
@@ -394,6 +398,10 @@ module.exports = {
                 path: '/lazyload',
                 title: 'Lazyload'
               },
+              {
+                path: '/list',
+                title: 'List'
+              },
               {
                 path: '/loading',
                 title: 'Loading'