message: docs(Slider): hide range usage in weapp
diff: <van-slider v-model="value1" @change="onChange" />
  </demo-block>
  - <demo-block :title="t('title2')">
  + <demo-block v-if="!isWeapp" :title="t('title2')">
  <van-slider range v-model="value2" @change="onChange" />
  </demo-block>
  