<view a:if="{{ error }}" class="exception-tip">
  <view class="img-exception" />
  <text a:if="{{ title }}" class="exception-title">{{ title }}</text>
  <text a:if="{{ subTitle }}" class="exception-sub-title">{{ subTitle }}</text>
  <button a:if="{{ btnText }}" class="exception-btn" onTap="handleBtn">{{ btnText }}</button>
</view>