fix: 解决picker组件start和end值不合法时表现异常的问题。

src/platforms/h5/components/app/popup/picker.vue

 <template>
   <uni-picker @touchmove.prevent>
     <transition name="uni-fade">
-      <div
-        v-show="visible"
-        class="uni-mask"
+      <div
+        v-show="visible"
+        class="uni-mask"
         @click="_cancel"/>
     </transition>
-    <div
-      :class="{'uni-picker-toggle':visible}"
+    <div
+      :class="{'uni-picker-toggle':visible}"
       class="uni-picker">
-      <div
-        class="uni-picker-header"
+      <div
+        class="uni-picker-header"
         @click.stop>
-        <div
-          class="uni-picker-action uni-picker-action-cancel"
+        <div
+          class="uni-picker-action uni-picker-action-cancel"
           @click="_cancel">取消</div>
-        <div
-          class="uni-picker-action uni-picker-action-confirm"
+        <div
+          class="uni-picker-action uni-picker-action-confirm"
           @click="_change">确定</div>
       </div>
-      <v-uni-picker-view
-        v-if="visible"
-        :value.sync="valueArray"
+      <v-uni-picker-view
+        v-if="visible"
+        :value.sync="valueArray"
         class="uni-picker-content">
-        <v-uni-picker-view-column
-          v-for="(range,index0) in rangeArray"
+        <v-uni-picker-view-column
+          v-for="(range,index0) in rangeArray"
           :key="index0">
           <div
             v-for="(item,index) in range"
@@ -173,13 +173,23 @@ export default {
     },
     startArray () {
       var splitStr = this.mode === mode.DATE ? '-' : ':'
-      return this.start.split(splitStr).map((val, i) => (this.mode === mode.DATE ? this.dateArray : this.timeArray)[i].indexOf(
+      var array = this.mode === mode.DATE ? this.dateArray : this.timeArray
+      var val = this.start.split(splitStr).map((val, i) => array[i].indexOf(
         val))
+      if (val.indexOf(-1) >= 0) {
+        val = array.map(() => 0)
+      }
+      return val
     },
     endArray () {
       var splitStr = this.mode === mode.DATE ? '-' : ':'
-      return this.end.split(splitStr).map((val, i) => (this.mode === mode.DATE ? this.dateArray : this.timeArray)[i].indexOf(
+      var array = this.mode === mode.DATE ? this.dateArray : this.timeArray
+      var val = this.end.split(splitStr).map((val, i) => array[i].indexOf(
         val))
+      if (val.indexOf(-1) >= 0) {
+        val = array.map((val) => val.length - 1)
+      }
+      return val
     },
     units () {
       switch (this.mode) {