[Doc] hide some demo in weapp (#3232)

packages/col/demo/index.vue

@@ -35,7 +35,10 @@
       </van-row>
     </demo-block>
 
-    <demo-block :title="$t('title3')">
+    <demo-block
+      v-if="!weapp"
+      :title="$t('title3')"
+    >
       <van-row type="flex">
         <van-col span="6">span: 6</van-col>
         <van-col span="6">span: 6</van-col>

packages/rate/demo/index.vue

@@ -22,7 +22,10 @@
       />
     </demo-block>
 
-    <demo-block :title="$t('halfStar')">
+    <demo-block
+      v-if="!weapp"
+      :title="$t('halfStar')"
+    >
       <van-rate
         v-model="value4"
         :size="25"

packages/slider/demo/index.vue

@@ -54,7 +54,10 @@
       </van-slider>
     </demo-block>
 
-    <demo-block :title="$t('vertical')">
+    <demo-block
+      v-if="!weapp"
+      :title="$t('vertical')"
+    >
       <div :style="{ height: '120px', paddingLeft: '30px' }">
         <van-slider
           v-model="value7"