* [html5] fix bug of scroll to

html5/browser/extend/api/dom.js

@@ -0,0 +1,45 @@
+'use strict'
+
+import scroll from 'scroll-to'
+
+const dom = {
+	/**
+   * scrollToElement
+   * @param  {string} ref
+   * @param  {obj} options {offset:Number}
+   *   ps: scroll-to has 'ease' and 'duration'(ms) as options.
+   */
+  scrollToElement: function (ref, options) {
+    !options && (options = {})
+    const offset = (Number(options.offset) || 0) * this.scale
+    const elem = this.getComponentManager().getComponent(ref)
+    if (!elem) {
+      return console.error(`[h5-render] component of ref ${ref} doesn\'t exist.`)
+    }
+    const parentScroller = elem.getParentScroller()
+    if (parentScroller) {
+      parentScroller.scroller.scrollToElement(elem.node, true, offset)
+    }
+    else {
+      const offsetTop = elem.node.getBoundingClientRect().top
+          + document.body.scrollTop
+      const tween = scroll(0, offsetTop + offset, options)
+      tween.on('end', function () {
+        console.log('scroll end.')
+      })
+    }
+  }
+}
+
+const meta = {
+  dom: [{
+    name: 'scrollToElement',
+    args: ['string', 'object']
+  }]
+}
+
+export default {
+  init: function (Weex) {
+    Weex.registerApiModule('dom', dom, meta)
+  }
+}

html5/browser/extend/api/index.js

@@ -1,3 +1,4 @@
+import dom from './dom'
 import event from './event'
 import pageInfo from './pageInfo'
 import stream from './stream'
@@ -11,6 +12,7 @@ import clipboard from './clipboard'
 
 export default {
   init: function (Weex) {
+    Weex.install(dom)
     Weex.install(event)
     Weex.install(pageInfo)
     Weex.install(stream)