wxml

<view class="weui-search-bar">
   <view class="weui-search-bar__form">
    <view class="weui-search-bar__box">
      <icon class="weui-icon-search_in-box" type="search" size="14"></icon>
      <input type="text" class="weui-search-bar__input" placeholder="請輸入查詢內容"
 
 value="{{SearchData.value}}" bindinput='SearchInput' bindconfirm="SearchConfirm" />
      <view class="weui-icon-clear" wx:if="{{SearchData.value.length > 0}}" bindtap="SearchClear">
        <icon type="clear" size="14"></icon>
      </view>
    </view>
  </view>
 

    <view class="weui-search-bar__cancel-btn" bindtap="SearchConfirm">
         <text wx:if="{{SearchData.value.length>0}}" data-key='search'>搜尋</text>
         <text wx:else data-key='back'>返回</text>
    </view>
</view>

wxss

.weui-search-bar {
  position
 
: relative;
  padding: 8px 10px;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  box-sizing: border-box;
  background-color: #efeff4;
  border-top: 1rpx solid #d7d6dc;
  border-bottom: 1rpx solid #d7d6dc;
}
.weui-icon-search {
  margin-right: 8px;
  font-size: inherit;
}

.weui-icon-search_in-box {
  position: absolute;
  left: 10px;
  top: 7px;
}
.weui-search-bar__form {
  position: relative;
  -webkit-box-flex: 1;
  -webkit-flex: auto;
  flex: auto;
  border-radius: 5px;
  background: #fff;
  border: 1rpx solid #e6e6ea;
}
.weui-search-bar__box {
  position: relative;
  padding-left: 30px;
  padding-right: 30px;
  width: 100%;
  box-sizing: border-box;
  z-index: 1;
}

.weui-search-bar__input {
  height: 28px;
  line-height: 28px;
  font-size: 14px;
}

.weui-icon-clear {
  position: absolute;
  top: 0;
  right: 0;
  padding: 7px 8px;
  font-size: 0;
}
.weui-search-bar__label {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  border-radius: 3px;
  text-align: center;
  color: #9b9b9b;
  background: #fff;
  line-height: 28px;
}
.weui-search-bar__cancel-btn {
  margin-left: 10px;
  line-height: 28px;
  color: #DC3C24;
  white-space: nowrap;
}