小程序-自定义组件理解

小程序自定义组件理解

1.先从page文件夹的页面开始，然后我们进行代码编写，按照不用模板的方式书写

2.创建一个component文件夹，然后将page页面wxml代码转移，此时最好设置一些可变参数，已方便之后使用。

3.在代码转移时，我们一般来说是界面从main.wxml->main.js->component.wxml->component.js->component.json->main.json

4.嵌套模块组件的方法：main.wxml->main.js->bigcomponent.wxml->bigcomponent.js->bigcomponent.json->main.json->smallcomponent.wxml->smallcomponent.js->smallcomponent.json->bigcomponent.json

演示理解

1.轮播图演示

main.wxml

<w-swiper list="{{banners}}" />

main.js

data: {
    //服务器对应数据改变
    banners: ['url1', 'url2', 'url3', 'url4']
}

component.wxml

<swiper class="swiper" circular="true"autoplay="true" interval="3000" duration="300" indicator-dots="true" indicator-active-color="#1296db">
<block wx:for="{{list}}" wx:key="{{index}}">
    <swiper-item class="swiper-item">
    <image class="image"src="{{item}}"/>
    <!-- <image src="{{item.image}}"/>服务器用法 -->
    </swiper-item>
</block>
</swiper>

component.js

properties: {
    list: {
    type: Array,
    value: []
    }
},

component.json

{
"component": true,
"usingComponents": {}
}

main.json

{
"usingComponents": {
    "w-swiper": "../../components/w-swiper/w-swiper", 
}
}

轮播图演示界面图

2.推荐数据的显示演示

main.wxml

<w-recommend recommends="{{recommends}}" />

main.js

data: {
    //服务器对应数据改变
 recommends: [{
    image: 'url4',
    text: '你好世界'
  }, {
    image: 'url3',
    text: '你好心情'
  },
  {
    image: 'url2',
    text: '你好爱你'
  },
  {
    image: 'url1',
    text: '你好东血'
  }
]
}

component.wxml

<view class="recommend">
<block wx:for="{{recommends}}" wx:key="{{index}}">
<view class="recommend-item">
  <image src="{{item.image}}" />
  <view>{{item.text}}</view>
  <!-- <image src="{{item.image}}" />
  <text>{{item.text}}</text> -->
</view>
</block>
</view>

component.js

properties: {
    recommends: {
    type: Array,
    value: []
    }
},

component.json

{
"component": true,
"usingComponents": {}
}

main.json

{
"usingComponents": {
    "w-recommend": "../childcpns/w-recommend/w-recommend"
}
}

推荐数据的显示演示界面图

3.商品数据展示演示（高级—嵌套模块组件）

main.wxml

<w-goods goods="{{goods[currentType].list}}" />

main.js

data: {
    //服务器对应数据改变
goods: {
'pop': {
    page: 0,
    list: [{
    image: 'ur1',
    title: '你好世界',
    price: 5,
    cfav: 4
    }, {
    image: 'url2',
    title: '你好世界',
    price: 5,
    cfav: 4
    }, {
    ...
    }, {
    ...
    }]
},
'new': {
    ......
},
'sell': {
    ......
}
}
}

bigcomponent.wxml

<view class="goods">
<block wx:for="{{goods}}" wx:key="{{index}}">
    <w-goods-item class="item" item="{{item}}" />
</block>
</view>

bigcomponent.js

properties: {
goods: {
    type: Array,
    value: []
}
},

main.json

{
"usingComponents": {
    "w-goods": "../childcpns/w-goods/w-goods"
}
}

smallcomponent.wxml

<view class="goods-item">
<image class="image" src="{{item.image}}" mode="widthFix" />
<view class="desc-info">
    <view class="title">{{item.title}}</view>
    <view class="info">
    <text class="price">¥{{item.price}}</text>
    <image  class="icon" src="../../assets/home.png"/>
    <text class="cfav">{{item.cfav}}</text>
    </view>
</view>
</view>

smallcomponent.js

properties: {
item: {
    type: 'object',
    value: {}
}
},

smallcomponent.json

{
    "component": true,
    "usingComponents": {}
}

bigcomponent.json

{
"component": true,
"usingComponents": {
    "w-goods-item": "../w-goods-item/w-goods-item"
}
}        

商品数据展示演示界面图