小程序自定义组件的实现方法（代码）

// components/threeColumnGrid/threecolgrid.js
Component({
  /**
   * 组件的属性列表
   */
  properties: {
    // 传入的数据
    booksData:{
      type: Array,
      value:[]
    },
    // grid的外边距
    mainMargin:{
      type: Number,
      value: 5
    },
    // grid的内边距
    mainPadding:{
      type:Number,
      value:10
    },
    // 行间距
    rowSpace:{
      type:Number,
      value:20
    },
    // 列间距
    colSpace:{
      type:Number,
      value:7
    }
  },

  /**
   * 组件的初始数据
   */
  data: {

  },

  /**
   * 组件的方法列表
   */
  methods: {
    checkIn:function(e){
      console.log(e.currentTarget.dataset)
      // 触发action事件，triggerEvent函数接受三个值：事件名称、数据、选项值  
      this.triggerEvent('action', e.currentTarget.dataset, {}) 
    }
  }
})

<!--components/threeColumnGrid/threecolgrid.wxml-->
<!-- <view class=&#39;main-content&#39;> -->
  <view class=&#39;bookbox&#39; style=&#39;padding:{{mainPadding}}rpx;margin:{{mainMargin}}rpx;&#39;>
    <block wx:for="{{booksData}}" wx:key="{{item.id}}">
      <view class=&#39;bookinfo&#39; style=&#39;margin-bottom: {{rowSpace}}rpx;&#39;>
        <image src=&#39;{{item.url}}&#39; mode="widthFix" style=&#39;width:{{(740 - 2*mainPadding - 2*mainMargin)/3 - colSpace*3}}rpx;&#39;></image>
        <view class="title" style=&#39;width:{{(740 - 2*mainPadding - 2*mainMargin)/3 - colSpace*3}}rpx;&#39;>{{item.title}}</view>
        <view class=&#39;actionBar&#39; style=&#39;width:{{(740 - 2*mainPadding - 2*mainMargin)/3 - colSpace*3}}rpx;&#39;>
          <block wx:if="{{item.status == 0}}">
            <view class=&#39;bookstatus disable&#39;>暂缺货</view>
            <view bindtap=&#39;checkIn&#39; data-bookid=&#39;{{item.id}}&#39; data-status=&#39;{{item.status}}&#39; class=&#39;iconfont icon-219-heart icon&#39;></view>
          </block>
          <block wx:else>
            <view class=&#39;bookstatus enable&#39;>可借阅</view>
            <view bindtap=&#39;checkIn&#39; data-bookid=&#39;{{item.id}}&#39; data-status=&#39;{{item.status}}&#39; class=&#39;iconfont icon-059-cart icon&#39;></view>
          </block>          
        </view>
      </view>
    </block>
  </view>
<!-- </view> -->

/* components/threeColumnGrid/threecolgrid.wxss */
@import "../../iconfont.wxss";
/* .main-content{
  background: #FFF;
  margin-top: 155rpx;
  padding:10rpx;
} */

.bookbox{
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  flex-wrap:wrap;
  background: #FFF;
}
.bookbox .bookinfo{
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  /* border: 1rpx solid #f5a32d; */
}
.bookbox .bookinfo image{
  display: flex;
  /* 调节图书列 */
  /* width:220rpx;  */
  border-top-left-radius: 10rpx;
  border-top-right-radius: 10rpx
}
.bookbox .bookinfo .title{
  display: flex;
  flex-wrap: wrap;
  font-size: small;
  margin-bottom: 5rpx;
  /* 调节图书列 */
  /* width:300rpx; */
  /* width:220rpx; */
  height: 70rpx;
}
.bookbox .bookinfo .actionBar{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0rpx 5rpx 5rpx 5rpx;
  font-size: smaller;
  /* width:200rpx; */
}

.bookbox .bookinfo .actionBar .bookstatus{
  display: flex;
  border-radius: 10rpx;
  padding:0rpx 5rpx;
}

.bookbox .bookinfo .actionBar .enable{
  color: #FFF;
  background-color: #f5a32d;
}

.bookbox .bookinfo .actionBar .disable{
  color: #FFF;
  background-color: #727171;
}

.bookbox .bookinfo .actionBar .icon{
  font-size: 15pt;
  color: #facea7;
}

.bookinfo-empty{
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 5rpx;
  width:230rpx;
}

  //事件处理函数
  getCheckValues: function(e){
    console.log('checkbox发生change事件，携带value值为：', e.detail)
  },

{

  "usingComponents": {
    "three-col-grid":"/components/threeColumnGrid/threecolgrid"
  },

}

  <view class=&#39;test&#39;>
    <three-col-grid booksData="{{BookList}}" bind:action="getCheckValues"></three-col-grid>
  </view>

.test{
  display: flex;
  justify-content: center;
  /* border: 1rpx #444 solid; */
}