wepy框架入门

安装 wepy 命令行工具。

npm install wepy-cli -g

在开发目录生成开发DEMO。

wepy new myproject

开发实时编译。

wepy build --watch

项目目录结构

    dist
    node_modules
    src
        components
            com_a.wpy
            com_b.wpy
        pages
            index.wpy
            page2.wpy
        app.wpy
    package.json

使用微信开发者工具新建项目，本地开发选择dist目录。
微信开发者工具 --> 项目 --> 关闭ES6转ES5。
本地项目根目录运行wepy build --watch，开启实时编译。

官方DEMO代码：

//index.js
//获取应用实例
var app = getApp()
Page({
  data: {
    motto: 'Hello World',
    userInfo: {}
  },
  //事件处理函数
  bindViewTap: function() {
    console.log('button clicked')
  },
  onLoad: function () {
    console.log('onLoad')
  }
})

基于wepy的实现：

import wepy from 'wepy';

export default class Index extends wepy.page {

    data = {
        motto: 'Hello World',
        userInfo: {}
    };
    methods = {
        bindViewTap () {
            console.log('button clicked');
        }
    };
    onLoad() {
        console.log('onLoad');
    };
}

wepy支持组件化开发
组件示例代码：

// index.wpy
<template>
    <view>
        <component id="pannel" path="pannel"></component>
        <component id="counter1" path="counter"></component>
        <component id="counter2" path="counter"></component>
        <component id="list" path="list"></component>
    </view>
</template>
<script>
import wepy from 'wepy';
import List from '../components/list';
import Panel from '../components/panel';
import Counter from '../components/counter';

export default class Index extends wepy.page {

    config = {
        "navigationBarTitleText": "test"
    };
    components = {
        panel: Panel,
        counter1: Counter,
        counter2: Counter,
        list: List
    };
}
</script>

官方DEMO：

project
    pages
        index
            index.json
            index.js
            index.wxml
            index.wxss
        log
            log.json
            log.wxml
            log.js
            log.wxss
    app.js
    app.json
    app.wxss

使用wepy框架后目录结构：

project
    src
        pages
            index.wpy
            log.wpy
        app.wpy

wepy默认使用babel编译，支持ES6 / 7的一些新特性

示例代码：

import wepy from 'wepy';

export default class Index extends wepy.page {

    getData() {
        return new Promise((resolve, reject) => {
            setTimeout(() => {
                resolve({data: 123});
            }, 3000);
        });
    };
    async onLoad() {
        let data = await this.getData();
        console.log(data.data);
    };
}

原有代码：

onLoad = function () {
    var self = this;
    wx.login({
        success: function (data) {
            wx.getUserInfo({
                success: function (userinfo) {
                    self.setData({userInfo: userinfo});
                }
            });
        }
    });
}

基于wepy实现代码：

async onLoad() {
    await wx.login();
    this.userInfo = await wx.getUserInfo();
}

执行wepy new demo后，会生成类似配置文件。

{
  "wpyExt": ".wpy",
  "sass": {},
  "less": {},
  "babel": {}
}

<style type="less" src="page1.less"></style>
<template type="wxml" src="page1.wxml"></template>
<script>
    // some code
</script>

程序入口app.wpy

<style type="less">
/** less **/
</style>
<script>
import wepy from 'wepy';
export default class extends wepy.app {
    config = {
            "pages":[
            "pages/index/index"
        ],
        "window":{
            "backgroundTextStyle": "light",
            "navigationBarBackgroundColor": "#fff",
            "navigationBarTitleText": "WeChat",
            "navigationBarTextStyle": "black"
        }
    };
    onLaunch() {
        console.log(this);
    }
}
</script>

wepy页面index.wpy

<style type="less">
/** less **/
</style>
<template type="wxml">
    <view>
    </view>
    <component id="counter1" path="counter"></component>
</template>
<script>
import wepy form 'wepy';
import Counter from '../components/counter';
export default class Index extends wepy.page {

    config = {};
    components = {counter1: Counter};

    data = {};
    methods = {};

    events = {};
    onLoad() {};
    // Other properties
}
</script>

wepy组件com.wpy

<style type="less">
/** less **/
</style>
<template type="wxml">
    <view>  </view>
</template>
<script>
import wepy form 'wepy';
export default class Com extends wepy.component {

    components = {};

    data = {};
    methods = {};

    events = {};
    // Other properties
}
</script>

wepy 组件通信与交互

wepy.component基类提供三个方法$broadcast，$emit，$invoke

$this.$emit('some-event', 1, 2, 3, 4);
组件的事件监听需要写在events属性下，如：

import wepy form 'wepy';
export default class Com extends wepy.component {

    components = {};

    data = {};
    methods = {};

    events = {
        'some-event': ($event, ...args) {
               console.log(`${this.name} receive ${$event.name} from ${$event.source.name}`);
        }
    };
    // Other properties
}

$invoke$invoke是一个组件对另一个组件的直接调用，通过传入的组件路径找到相应组件，然后再调用其方法。
如果想在Page_Index中调用组件A的某个方法：

this.$invoke('ComA', 'someMethod', 'someArgs');
如果想在组件A中调用组件G的某个方法：

this.$invoke('./../ComB/ComG', 'someMethod', 'someArgs');

小程序通过Page提供的setData方法去绑定数据，如：

this.setData({title: 'this is title'});

wepy数据绑定方式

this.title = 'this is title';

在函数运行周期之外的函数里去修改数据需要手动调用$apply方法。如：

setTimeout(() => {
    this.title = 'this is title';
    this.$apply();
}, 3000);

// 官方

wx.request({
    url: 'xxx',
    success: function (data) {
        console.log(data);
    }
});

// wepy 使用方式
// request 接口从只接收Object变为可接收String

wx.request('xxxx').then((d) => console.log(d));

优化事件参数传递

// 官方
<view id="tapTest" data-hi="WeChat" bindtap="tapName"> Click me! </view>
Page({
  tapName: function(event) {
    console.log(event.currentTarget.hi)// output: WeChat
  }
});

// wepy 建议传参方式
<view id="tapTest" data-wepy-params="1-wepy-something" bindtap="tapName"> Click me! </view>

events: {
    tapName (event, id, title, other) {
        console.log(id, title, other)// output: 1, wepy, something
    }
}

改变数据绑定方式

// 官方
<view> {{ message }} </view>

onLoad: function () {
    this.setData({message: 'hello world'});
}


// wepy
<view> {{ message }} </view>

onLoad () {
    this.message = 'hello world';
}

组件代替模板和模块

// 官方
<!-- item.wxml -->
<template name="item">
  <text>{{text}}</text>
</template>

<!-- index.wxml -->
<import src="item.wxml"/>
<template is="item" data="{{text: 'forbar'}}"/>

<!-- index.js -->
var item = require('item.js')




// wepy
<!-- /components/item.wpy -->
 <text>{{text}}</text>

<!-- index.wpy -->
<template>
    <component id="item"></component>
</template>
<script>
    import wepy from 'wepy';
    import Item from '../components/item';
    export default class Index extends wepy.page {
        components = { Item }
    }
</script>

WePY Demo

<style lang="less">
    @color: #4D926F;
    .userinfo {
        color: @color;
    }
</style>
<template lang="pug">
    view(class='container')
        view(class='userinfo' @tap='tap')
            mycom(:prop.sync='myprop' @fn.user='myevent')
            text {{now}}
</template>

<script>
    import wepy from 'wepy';
    import mycom from '../components/mycom';

    export default class Index extends wepy.page {
        
        components = { mycom };
        data = {
            myprop: {}
        };
        computed = {
            now () { return +new Date(); }
        };
        async onLoad() {
            await sleep(3);
            console.log('Hello World');
        }
        sleep(time) {
            return new Promise((resolve, reject) => setTimeout(() => resolve, time * 1000));
        }
    }
</script>

登录相关API wx.login。
获取用户信息API wx.getUserInfo。
Storage相关 wx.getStorage，wx.setStorage，wx.clearStorage。

开发

目录结构：

src
    components
        alpha.wpy --- 联系人
        chatboard.wpy --- "聊天面板" 组件
        contact.wpy --- "联系人" 组件
        discovery.wpy --- "发现" 组件
        input.wpy --- 聊天页输入框组件
        list.wpy --- 菜单列表组件
        me.wpy --- "我" 组件
        message.wpy --- message 组件
        tab.wpy --- tab 组件
    pages
        chat.wpy --- 聊天页
        index.wpy --- 首页
    app.wpy --- 小程序入口

src/pages/index.wpy：

<style type="sass">
    .body, .tab_item {
        height: 100%;
    }
</style>
<template>
    <view class="body">
        <view class="tab_item tab_message">
            <component id="message"></component>
        </view>
        <view class="tab_item tab_contact">
            <component id="contact"></component>
        </view>
        <view class="tab_item tab_discovery">
            <component id="discovery"></component>
        </view>
        <view class="tab_item tab_me">
            <component id="me"></component>
        </view>
        <component id="tab"></component>
    </view>
</template>
src/pages/chat.wpy:

<style type="sass">
    .body {
        height: 100%;
        background-color: #ededed;
    }
</style>
<template>
    <view class="body">
        <component id="chartboard"></component>
        <component id="input"></component>
    </view>
</template>

import m_contacts from '../mocks/contact';
import m_history from '../mocks/history';

export default {
    
    // 拉取用户信息
    getUserInfo () {},
    
    // 拉取与某个用户的聊天历史记录
    getHistory (id) {},
    
    // 拉取首页聊天列表
    getMessageList () {},

    // 发送聊天信息
    sendMsg (to, msg, type = 'text') {}
}

<template>
    <view class="message">
        <block wx:for="{{list}}" wx:for-index="index" wx:for-item="item">
            <view class="item" bindtap="select" data-wepy-params="{{item.id}}">
                <view class="header">
                    <image class="img" src="{{item.icon}}"></image>
                </view>
                <view class="content">
                    <view class="name">{{item.name}}</view>
                    <view class="lastmsg">{{item.lastmsg}}</view>
                </view>
            </view>
        </block>
    </view>
</template>
<script>
    import wepy from 'wepy';
    import api from '../common/api';

    export default class Message extends wepy.component {

        data = {
            list: []
        };
      
        methods = {
            select (evt, id) {
                wx.navigateTo({url: 'chat?id=' + id});
            }
        };
        async loadMessage () {
            this.list = await api.getMessageList();
            this.$apply();
        }
    }
</script>

// src/pages/index.wpy
onShow() {
    this.$invoke('message', 'loadMessage');
}

src/pages/index：

<template>
    <view class="body">
        <view class="tab_item tab_message" hidden="{{currentTab != 0}}">
            <component id="message"></component>
        </view>
        <view class="tab_item tab_contact" hidden="{{currentTab != 1}}">
            <component id="contact"></component>
        </view>
        <view class="tab_item tab_discovery" hidden="{{currentTab != 2}}">
            <component id="discovery"></component>
        </view>
        <view class="tab_item tab_me" hidden="{{currentTab != 3}}">
            <component id="me"></component>
        </view>
        <component id="tab"></component>
    </view>
</template>

<script>
    //....
    changeTab (idx) {
        this.currentTab = +idx;
        this.$apply();
    }
</script>

<script>
    import wepy from 'wepy';

    export default class Tab extends wepy.component {
        data = {
            active: 0,
        };
        methods = {
            change (evt, idx) {
                this.active = +idx;
                this.$parent.changeTab(idx);
            }
        };
    }
</script>

parent.wpy
<child :item.sync="myitem" />

<repeat for="{{list}}" item="item" index="index">
   <item :item="item" />
</repeat>

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