小程序顶部搜索框怎么实现

<!--搜索框 -->
<view class="weui-search-bar">
 <view class="weui-search-bar__form">
 <!--点击之后，出现input框 -->
 <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="搜索" value="{{inputVal}}" focus="{{inputShowed}}" bindinput="inputTyping" />
  <!--输入款字数大于0，则显示清除按钮 -->
  <view class="weui-icon-clear" wx:if="{{inputVal.length > 0}}" bindtap="clearInput">
  <icon type="clear" size="14"></icon>
  </view>
 </view>
 <!--没点击之前，只是一些文字和图标 -->
 <label class="weui-search-bar__label" hidden="{{inputShowed}}" bindtap="showInput">
  <icon class="weui-icon-search" type="search" size="14"></icon>
  <view class="weui-search-bar__text">搜索</view>
 </label>
 </view>
 <!--动态出现的“取消”键 -->
 <view class="weui-search-bar__cancel-btn" hidden="{{!inputShowed}}" bindtap="hideInput">取消</view>
</view>

.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__text {
 display: inline-block;
 font-size: 14px;
 vertical-align: middle;
}
.weui-search-bar__form {
 position: relative;
 -webkit-box-flex: 1;
 -webkit-flex: auto;
   flex: auto;
 border-radius: 5px;
 background: #FFFFFF;
 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: #FFFFFF;
 line-height: 28px;
}
.weui-search-bar__cancel-btn {
 margin-left: 10px;
 line-height: 28px;
 color: #09BB07;
 white-space: nowrap;
 font-size: 30rpx;
}

showInput: function () {
this.setData({
 inputShowed: true
});
},
hideInput: function () {
this.setData({
 inputVal: "",
 inputShowed: false
});
// getList(this);
},
clearInput: function () {
this.setData({
 inputVal: ""
});
// getList(this);
},
inputTyping: function (e) {
//搜索数据
// getList(this, e.detail.value);
this.setData({
 inputVal: e.detail.value
});
}