message: [bugfix] Picker: change event not triggered when click option
diff: 'van-picker-column--disabled': isDisabled(option),
  'van-picker-column--selected': index === currentIndex
  }"
  - @click="setIndex(index)"
  + @click="setIndex(index, true)"
  />
  </ul>
  </div>
  @@ -134,8 +134,7 @@ export default create({
  0,
  this.count - 1
  ]);
  - this.setIndex(index);
  - this.$emit('change', index);
  + this.setIndex(index, true);
  }
  },
  @@ -157,10 +156,14 @@ export default create({
  return typeof option === 'object' && this.valueKey in option ? option[this.valueKey] : option;
  },
  - setIndex(index) {
  + setIndex(index, userAction) {
  index = this.adjustIndex(index);
  this.offset = -index * this.itemHeight;
  +
  + if (index !== this.currentIndex) {
  this.currentIndex = index;
  + userAction && this.$emit('change', index);
  + }
  },
  setValue(value) {
  