fix(taro-components): 修复swiper 更新数据之后，容器宽高没有重置的问题， issue#296，

packages/taro-components/src/components/swiper/swiper.js

@@ -44,19 +44,53 @@ class Swiper extends Nerv.Component {
     this.pauseAutoPlay = this.pauseAutoPlay.bind(this)
     this.autoplay = this.autoplay.bind(this)
     this.computedChangeContainer = this.computedChangeContainer.bind(this)
+    this.updateContainerBox = this.updateContainerBox.bind(this)
   }
 
   componentDidMount () {
+    this.updateContainerBox(this.props.children)
+
+    if (this.props.autoplay) this.autoplay(this.props.interval)
+  }
+
+  componentWillReceiveProps (nextProps) {
+    this.updateContainerBox(nextProps.children)
+    const { interval, autoplay, circular } = nextProps
+    this.pauseAutoPlay()
+    // this.updateCurrentIndex(current)
+    if (!circular) {
+      this.computedChangeContainer()
+    }
+    if (!autoplay) return
+
+    this.autoplay(interval)
+  }
+
+  componentWillUnmount () {
+    this.pauseAutoPlay()
+  }
+
+  // 在开关衔接滑动的时候，计算当前下标
+  computedChangeContainer () {
+    if (this.props.children.length - 1 === this.state.currentIndex) {
+      this.pauseAutoPlay()
+      return true
+    }
+    return false
+  }
+
+  // 更新容器的宽高
+  updateContainerBox (children) {
     let $container = Nerv.findDOMNode(this.SwiperWp)
+    let childLen = children.length
 
     // 默认偏移量
     let offsetVal =
-      this.props.current <= this.props.children.length + 2
+      this.props.current <= children + 2
         ? !this.props.vertical
           ? $container.offsetWidth * -this.props.current
           : $container.offsetHeight * -this.props.current
         : 0
-    let childLen = this.props.children.length
 
     // 是否衔接滑动
     // if (this.props.circular) {
@@ -79,33 +113,6 @@ class Swiper extends Nerv.Component {
       // 计算指定下标位置
       translate: offsetVal
     })
-
-    if (this.props.autoplay) this.autoplay(this.props.interval)
-  }
-
-  componentWillReceiveProps (nextProps) {
-    const { interval, autoplay, circular } = nextProps
-    this.pauseAutoPlay()
-    // this.updateCurrentIndex(current)
-    if (!circular) {
-      this.computedChangeContainer()
-    }
-    if (!autoplay) return
-
-    this.autoplay(interval)
-  }
-
-  componentWillUnmount () {
-    this.pauseAutoPlay()
-  }
-
-  // 在开关衔接滑动的时候，计算当前下标
-  computedChangeContainer () {
-    if (this.props.children.length - 1 === this.state.currentIndex) {
-      this.pauseAutoPlay()
-      return true
-    }
-    return false
   }
 
   // 更新下标