很简单：记录一下
想组件封装，直接右键:点击新建点击Component
基本结构是这样的

image.png

image.png

这里以封装搜索框为例子
直接上代码：
js代码：

// components/search.js
Component({
  /**
   * 组件的属性列表
   */
  properties: {
    placeholder: {
      type: String,
      value: '请输入',
    },
  },
  /**
   * 页面的初始数据
   */
  data: {
    showClear: false,
    inputValue: null,
  },
  methods: {
    changeEvent(e) {
      this.setData({ showClear: e.detail.value.length > 0 ? true : false });
      this.triggerEvent('changeEvent', e.detail.value);
    },
    bindconfirm(e) {
      this.triggerEvent('confirmEvent', e.detail.value);
    },
    loseFouse() {
      setTimeout(() => {
        this.setData({ showClear: false });
      }, 100);
      this.triggerEvent('loseFouse',);
    },
    bindfocus(e) {
      this.setData({ showClear: e.detail.value.length > 0 ? true : false });
      this.triggerEvent('bindfocus');
    },
    clearEvent() {
      console.log('点击了');
      this.setData({
        showClear: false,
        inputValue: '',
      });
      this.triggerEvent('clearEvent');
    },
  },
  bindkeyboardheightchange(e) {
    this.triggerEvent('bindkeyboardheightchange',e.detail);
  },
  
});

wxml：其中<van-icon>是图标：可以去掉；image 的src是删除的图片,自行添加

<view class="search-view">
    <view style="width: 100%;display: flex; align-items: center;">
        <van-icon name="search" size="16px" color="#a9aeb8"/>
        <input style="flex:1;" placeholder='{{placeholder}}' placeholder-class="phStyle" bindinput="changeEvent" value="{{inputValue}}" bindblur="loseFouse" bindfocus="bindfocus"  bindconfirm="bindconfirm" bindkeyboardheightchange="bindkeyboardheightchange" />
        <image wx:if="{{showClear}}" src="/images/fans/delete.png" style="margin-left: 10px;width: 14px;height: 14px;" bindtap="clearEvent"></image>
    </view>
</view>

wxss

/* components/search.wxss */
.search-view {
  display: flex;
  background-color: #ebebeb;
  border-radius: 25px;
  padding: 4px 15px 4px 15px;
  align-items: center;
}

.phStyle {
  color: #a9aeb8;
  font-size: 13px;
}

使用：
1、引入

{
  "usingComponents": {
    "search": "/components/search/search"
  }
}

2、wxml

 <search style="flex: 1;" bind:changeEvent="changeEvent" bind:clearEvent="clearEvent" bind:confirmEvent="confirmEvent" placeholder="请输入姓名或身份证后6位或手机号"></search>

3、需注意的时，最终拿到的值是e.detail

changeEvent(e) {
    console.log(e.detail);
  },