[new feature] Swipe add 'initialSwipe' prop (#279)

* [bugfix] CouponList always show empty info

* [bugfix] add click feedback of buttons in components

* [Doc] add custom theme document

* [new feature] Notice bar support more props

* [bugfix] PullRefresh test cases

* [bugfix] unused NoticeBar style

* [bugfix] Swipe width calc error

* [Doc] english document of all action components

* [Doc] change document site path to /zanui/vant

* [Doc] fix

* [bugfix] uploader style error

* [bugfix] tabs document demo

* [new feature] Cell support vue-router target route

* [bugfix] add cell test cases

* update yarn.lock

* [bugfix] Tabbar cann't display info when use icon slot

* [Doc] update document title

* [bugfix] Dialog should reset button text when showed

* [new feature] CouponList add showCloseButton prop

* [new feature] Swipe add 'initialSwipe' prop

docs/examples-docs/en-US/swipe.md

@@ -72,6 +72,7 @@ export default {
 | autoplay | Autoplay interval (ms) | `Number` | - | - |
 | duration | Animation duration (ms) | `Number` | `500` | - |
 | showIndicators | Whether to show indocators | `Boolean` | `true` | - |
+| initialSwipe | Index of initial swipe, start from 0 | `Number` | `0` | - |
 
 ### Event
 

docs/examples-docs/zh-CN/swipe.md

@@ -80,7 +80,7 @@ Vue.component(SwipeItem.name, SwipeItem);
 
 :::demo 图片懒加载
 ```html
-<van-swipe>
+<van-swipe :autoplay="3000">
   <van-swipe-item v-for="(image, index) in images" :key="index">
     <img v-lazy="image" />
   </van-swipe-item>
@@ -108,6 +108,7 @@ export default {
 | autoplay | 自动轮播间隔，单位为 ms | `Number` | - | - |
 | duration | 动画时长，单位为 ms | `Number` | `500` | - |
 | showIndicators | 是否显示指示器 | `Boolean` | `true` | - |
+| initialSwipe | 初始位置，从 0 开始算 | `Number` | `0` | - |
 
 ### 事件