微信小程序textarea聚焦光标不显示，设置了auto-focus 可以聚焦，但是没有光标，座椅输入内容之后不能删除，除非清空！！！

<view class="similar-desc sm_border {{faultBox.faultDescVal?'':'si-gray'}}" wx:if="{{faultBox.faultDescSimulateShow}}" bindtap="bindFaultSimulateShow">{{faultBox.faultDescVal?faultBox.faultDescVal:'故障简述'}}</view>

<textarea wx:else placeholder="故障简述" class="sm_border" placeholder-style="color:#999;" maxlength="200" value="{{faultBox.faultDescVal}}" auto-focus bindinput="bindFaultDescInput" bindblur="bindFaultDescBlur" />