diff --git a/packages/index-bar/index.js b/packages/index-bar/index.js
index 4bcefdc29..5b8f297c4 100644
--- a/packages/index-bar/index.js
+++ b/packages/index-bar/index.js
@@ -136,15 +136,19 @@ export default sfc({
 
         const { clientX, clientY } = event.touches[0];
         const target = document.elementFromPoint(clientX, clientY);
-        this.scrollToElement(target);
+        if (target) {
+          const { idx } = target.dataset;
+
+          /* istanbul ignore else */
+          if (this.touchActiveIdx !== idx) {
+            this.touchActiveIdx = idx;
+            this.scrollToElement(target);
+          }
+        }
       }
     },
 
     scrollToElement(element, setActive) {
-      if (!element) {
-        return;
-      }
-
       const { index } = element.dataset;
       if (!index) {
         return;
@@ -178,6 +182,7 @@ export default sfc({
             <span
               class={bem('index')}
               style={idx === this.activeAnchorIndex ? this.highlightStyle : null}
+              data-idx={idx}
               data-index={index}
             >
               {index}
diff --git a/packages/index-bar/test/__snapshots__/demo.spec.js.snap b/packages/index-bar/test/__snapshots__/demo.spec.js.snap
index 7254b82c2..da12ad6c0 100644
--- a/packages/index-bar/test/__snapshots__/demo.spec.js.snap
+++ b/packages/index-bar/test/__snapshots__/demo.spec.js.snap
@@ -13,7 +13,7 @@ exports[`renders demo correctly 1`] = `
     <div class="van-tabs__content">
       <div role="tabpanel" class="van-tab__pane" style="">
         <div class="van-index-bar">
-          <div class="van-index-bar__sidebar" style="z-index: 1;"><span data-index="A" class="van-index-bar__index">A</span><span data-index="B" class="van-index-bar__index">B</span><span data-index="C" class="van-index-bar__index">C</span><span data-index="D" class="van-index-bar__index">D</span><span data-index="E" class="van-index-bar__index">E</span><span data-index="F" class="van-index-bar__index">F</span><span data-index="G" class="van-index-bar__index">G</span><span data-index="H" class="van-index-bar__index">H</span><span data-index="I" class="van-index-bar__index">I</span><span data-index="J" class="van-index-bar__index">J</span><span data-index="K" class="van-index-bar__index">K</span><span data-index="L" class="van-index-bar__index">L</span><span data-index="M" class="van-index-bar__index">M</span><span data-index="N" class="van-index-bar__index">N</span><span data-index="O" class="van-index-bar__index">O</span><span data-index="P" class="van-index-bar__index">P</span><span data-index="Q" class="van-index-bar__index">Q</span><span data-index="R" class="van-index-bar__index">R</span><span data-index="S" class="van-index-bar__index">S</span><span data-index="T" class="van-index-bar__index">T</span><span data-index="U" class="van-index-bar__index">U</span><span data-index="V" class="van-index-bar__index">V</span><span data-index="W" class="van-index-bar__index">W</span><span data-index="X" class="van-index-bar__index">X</span><span data-index="Y" class="van-index-bar__index">Y</span><span data-index="Z" class="van-index-bar__index">Z</span></div>
+          <div class="van-index-bar__sidebar" style="z-index: 1;"><span data-idx="0" data-index="A" class="van-index-bar__index">A</span><span data-idx="1" data-index="B" class="van-index-bar__index">B</span><span data-idx="2" data-index="C" class="van-index-bar__index">C</span><span data-idx="3" data-index="D" class="van-index-bar__index">D</span><span data-idx="4" data-index="E" class="van-index-bar__index">E</span><span data-idx="5" data-index="F" class="van-index-bar__index">F</span><span data-idx="6" data-index="G" class="van-index-bar__index">G</span><span data-idx="7" data-index="H" class="van-index-bar__index">H</span><span data-idx="8" data-index="I" class="van-index-bar__index">I</span><span data-idx="9" data-index="J" class="van-index-bar__index">J</span><span data-idx="10" data-index="K" class="van-index-bar__index">K</span><span data-idx="11" data-index="L" class="van-index-bar__index">L</span><span data-idx="12" data-index="M" class="van-index-bar__index">M</span><span data-idx="13" data-index="N" class="van-index-bar__index">N</span><span data-idx="14" data-index="O" class="van-index-bar__index">O</span><span data-idx="15" data-index="P" class="van-index-bar__index">P</span><span data-idx="16" data-index="Q" class="van-index-bar__index">Q</span><span data-idx="17" data-index="R" class="van-index-bar__index">R</span><span data-idx="18" data-index="S" class="van-index-bar__index">S</span><span data-idx="19" data-index="T" class="van-index-bar__index">T</span><span data-idx="20" data-index="U" class="van-index-bar__index">U</span><span data-idx="21" data-index="V" class="van-index-bar__index">V</span><span data-idx="22" data-index="W" class="van-index-bar__index">W</span><span data-idx="23" data-index="X" class="van-index-bar__index">X</span><span data-idx="24" data-index="Y" class="van-index-bar__index">Y</span><span data-idx="25" data-index="Z" class="van-index-bar__index">Z</span></div>
           <div>
             <div>
               <div class="van-index-anchor">A</div>
diff --git a/packages/index-bar/test/__snapshots__/index.spec.js.snap b/packages/index-bar/test/__snapshots__/index.spec.js.snap
index 875e11e66..72f3bcb52 100644
--- a/packages/index-bar/test/__snapshots__/index.spec.js.snap
+++ b/packages/index-bar/test/__snapshots__/index.spec.js.snap
@@ -2,7 +2,7 @@
 
 exports[`custom anchor text 1`] = `
 <div class="van-index-bar">
-  <div class="van-index-bar__sidebar" style="z-index: 1;"><span data-index="A" class="van-index-bar__index">A</span><span data-index="B" class="van-index-bar__index">B</span><span data-index="C" class="van-index-bar__index">C</span><span data-index="D" class="van-index-bar__index">D</span><span data-index="E" class="van-index-bar__index">E</span><span data-index="F" class="van-index-bar__index">F</span><span data-index="G" class="van-index-bar__index">G</span><span data-index="H" class="van-index-bar__index">H</span><span data-index="I" class="van-index-bar__index">I</span><span data-index="J" class="van-index-bar__index">J</span><span data-index="K" class="van-index-bar__index">K</span><span data-index="L" class="van-index-bar__index">L</span><span data-index="M" class="van-index-bar__index">M</span><span data-index="N" class="van-index-bar__index">N</span><span data-index="O" class="van-index-bar__index">O</span><span data-index="P" class="van-index-bar__index">P</span><span data-index="Q" class="van-index-bar__index">Q</span><span data-index="R" class="van-index-bar__index">R</span><span data-index="S" class="van-index-bar__index">S</span><span data-index="T" class="van-index-bar__index">T</span><span data-index="U" class="van-index-bar__index">U</span><span data-index="V" class="van-index-bar__index">V</span><span data-index="W" class="van-index-bar__index">W</span><span data-index="X" class="van-index-bar__index">X</span><span data-index="Y" class="van-index-bar__index">Y</span><span data-index="Z" class="van-index-bar__index">Z</span></div>
+  <div class="van-index-bar__sidebar" style="z-index: 1;"><span data-idx="0" data-index="A" class="van-index-bar__index">A</span><span data-idx="1" data-index="B" class="van-index-bar__index">B</span><span data-idx="2" data-index="C" class="van-index-bar__index">C</span><span data-idx="3" data-index="D" class="van-index-bar__index">D</span><span data-idx="4" data-index="E" class="van-index-bar__index">E</span><span data-idx="5" data-index="F" class="van-index-bar__index">F</span><span data-idx="6" data-index="G" class="van-index-bar__index">G</span><span data-idx="7" data-index="H" class="van-index-bar__index">H</span><span data-idx="8" data-index="I" class="van-index-bar__index">I</span><span data-idx="9" data-index="J" class="van-index-bar__index">J</span><span data-idx="10" data-index="K" class="van-index-bar__index">K</span><span data-idx="11" data-index="L" class="van-index-bar__index">L</span><span data-idx="12" data-index="M" class="van-index-bar__index">M</span><span data-idx="13" data-index="N" class="van-index-bar__index">N</span><span data-idx="14" data-index="O" class="van-index-bar__index">O</span><span data-idx="15" data-index="P" class="van-index-bar__index">P</span><span data-idx="16" data-index="Q" class="van-index-bar__index">Q</span><span data-idx="17" data-index="R" class="van-index-bar__index">R</span><span data-idx="18" data-index="S" class="van-index-bar__index">S</span><span data-idx="19" data-index="T" class="van-index-bar__index">T</span><span data-idx="20" data-index="U" class="van-index-bar__index">U</span><span data-idx="21" data-index="V" class="van-index-bar__index">V</span><span data-idx="22" data-index="W" class="van-index-bar__index">W</span><span data-idx="23" data-index="X" class="van-index-bar__index">X</span><span data-idx="24" data-index="Y" class="van-index-bar__index">Y</span><span data-idx="25" data-index="Z" class="van-index-bar__index">Z</span></div>
   <div>
     <div class="van-index-anchor">Title A</div>
   </div>