提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/submit-bar/index.wxml

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+<wxs src="../wxs/utils.wxs" module="utils" />
+
+<view class="van-submit-bar custom-class">
+  <slot name="top" />
+
+  <view class="van-submit-bar__tip">
+    <van-icon
+      wx:if="{{ tipIcon }}"
+      size="12px"
+      name="{{ tipIcon }}"
+      custom-class="van-submit-bar__tip-icon"
+    />
+    <view wx:if="{{ hasTip }}" class="van-submit-bar__tip-text">
+      {{ tip }}
+    </view>
+    <slot name="tip" />
+  </view>
+
+  <view class="bar-class van-submit-bar__bar">
+    <slot />
+    <view wx:if="{{ hasPrice }}" class="van-submit-bar__text">
+      <text>{{ label || '合计：' }}</text>
+      <text class="van-submit-bar__price price-class">
+        <text class="van-submit-bar__currency">{{ currency }} </text>
+        <text class="van-submit-bar__price-integer">{{ integerStr }}</text><text>{{decimalStr}}</text>
+      </text>
+      <text class="van-submit-bar__suffix-label">{{ suffixLabel }}</text>
+    </view>
+    <van-button
+      round
+      type="{{ buttonType }}"
+      loading="{{ loading }}"
+      disabled="{{ disabled }}"
+      class="van-submit-bar__button"
+      custom-class="button-class"
+      custom-style="width: 100%;"
+      bind:click="onSubmit"
+    >
+      {{ loading ? '' : buttonText }}
+    </van-button>
+  </view>
+
+  <view wx:if="{{ safeAreaInsetBottom }}" class="van-submit-bar__safe" />
+</view>