小程序框架-＞框架，视图层，生命周期(逻辑层)

• 框架
• 视图层
• 生命周期(逻辑层)

1.框架

小程序开发框架的目标是通过尽可能简单、高效的方式让开发者可以在微信中开发具有原生 APP 体验的服务。

整个小程序框架系统分为两部分：**[逻辑层](https://developers.weixin.qq.com/miniprogram/dev/framework/app-service/)**（App Service）和 **[视图层](https://developers.weixin.qq.com/miniprogram/dev/framework/view/)**（View）。小程序提供了自己的视图层描述语言 `WXML` 和 `WXSS`，以及基于 `JavaScript` 的逻辑层框架，并在视图层与逻辑层间提供了数据传输和事件系统，让开发者能够专注于数据与逻辑。
 

2.视图层

//min2\app.json
{"pages":["pages/a/a","pages/b/b","pages/c/c","pages/d/d","pages/user/user","pages/index/index","pages/logs/logs"],"window":{"backgroundTextStyle":"light","navigationBarBackgroundColor": "#00f","navigationBarTitleText": "Weixin","navigationBarTextStyle":"black"},"style": "v2","sitemapLocation": "sitemap.json"
}

//min2\pages\a\a.js
C:\Users\朱\WeChatProjects\min2\pages\a\a.json
C:\Users\朱\WeChatProjects\min2\pages\a\a.wxml
C:\Users\朱\WeChatProjects\min2\pages\a\a.wxss
<!--pages/a/a.wxml-->
<view> {{message}} </view>
<view wx:for="{{array}}"> {{item}} </view>
<view wx:for="{{users}}"> 用户编号:{{item.id}};用户姓名:{{item.name}} </view><!--wxml-->
<view wx:if="{{view == '1'}}"> WEBVIEW </view>
<view wx:elif="{{view == '2'}}"> APP </view>
<view wx:else="{{view == '3'}}"> MINA </view><!--wxml-->
<template name="staffName"><view>FirstName: {{firstName}}, LastName: {{lastName}}</view><view>FirstName: {{firstName}}, LastName: {{lastName}}</view>
</template><template is="staffName" data="{{...staffA}}"></template>
<template is="staffName" data="{{...staffB}}"></template>
<template is="staffName" data="{{...staffC}}"></template><view id="tapTest" data-hi="Weixin" data-meetingState="6" bindtap="tapName"> Click me! </view>

// pages/a/a.js
Page({/*** 页面的初始数据*/data: {message: 'Hello 页面一',array:[1,2,3,4,5],users:[{id:1,name:'牛逼'},{id:2,name:'晴天'},{id:3,name:'雨天'}],view:2,staffA: {firstName: 'Hulk', lastName: 'Hu'},staffB: {firstName: 'Shang', lastName: 'You'},staffC: {firstName: 'Gideon', lastName: 'Lin'}},tapName: function(event) {console.log(event);console.log(event.target.dataset);},/*** 生命周期函数--监听页面加载*/onLoad(options) {},/*** 生命周期函数--监听页面初次渲染完成*/onReady() {},/*** 生命周期函数--监听页面显示*/onShow() {},/*** 生命周期函数--监听页面隐藏*/onHide() {},/*** 生命周期函数--监听页面卸载*/onUnload() {},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh() {},/*** 页面上拉触底事件的处理函数*/onReachBottom() {},/*** 用户点击右上角分享*/onShareAppMessage() {}
})

2.生命周期(逻辑层)

## 响应的数据绑定

框架的核心是一个响应的数据绑定系统，可以让数据与视图非常简单地保持同步。当做数据修改的时候，只需要在逻辑层修改数据，视图层就会做相应的更新。

//min2\app.json
{"pages":["pages/index/index","pages/a/a","pages/b/b","pages/c/c","pages/d/d","pages/user/user","pages/logs/logs"
],
"window":{"backgroundTextStyle":"light","navigationBarBackgroundColor": "#00f","navigationBarTitleText": "Weixin","navigationBarTextStyle":"black"
},
"tabBar": {"list": [{"pagePath": "pages/index/index","text": "首页"}, {"pagePath": "pages/a/a","text": "a页面"}, {"pagePath": "pages/b/b","text": "b页面"}]
},
"style": "v2",
"sitemapLocation": "sitemap.json"
}

 

// pages/a/a.js
Page({/*** 页面的初始数据*/data: {message: 'Hello 页面一',array:[1,2,3,4,5],users:[{id:1,name:'牛逼'},{id:2,name:'晴天'},{id:3,name:'雨天'}],view:2,staffA: {firstName: 'Hulk', lastName: 'Hu'},staffB: {firstName: 'Shang', lastName: 'You'},staffC: {firstName: 'Gideon', lastName: 'Lin'}},tapName: function(event) {console.log(event);console.log(event.target.dataset);},a2b:function() {wx.switchTab({url: '/pages/b/b',})},a2c:function() {wx.navigateTo({url: '/pages/c/c',})},/*** 生命周期函数--监听页面加载*/onLoad(options) {
console.log("a.onload");},/*** 生命周期函数--监听页面初次渲染完成*/onReady() {console.log("a.onReady");},/*** 生命周期函数--监听页面显示*/onShow() {console.log("a.onShow");},/*** 生命周期函数--监听页面隐藏*/onHide() {console.log("a.onHide");},/*** 生命周期函数--监听页面卸载*/onUnload() {console.log("a.onUnload");},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh() {},/*** 页面上拉触底事件的处理函数*/onReachBottom() {},/*** 用户点击右上角分享*/onShareAppMessage() {}
})

 

<!--pages/a/a.wxml-->
<view> {{message}} </view>
<view wx:for="{{array}}"> {{item}} </view>
<view wx:for="{{users}}"> 用户编号:{{item.id}};用户姓名:{{item.name}} </view><!--wxml-->
<view wx:if="{{view == '1'}}"> WEBVIEW </view>
<view wx:elif="{{view == '2'}}"> APP </view>
<view wx:else="{{view == '3'}}"> MINA </view><!--wxml-->
<template name="staffName"><view>FirstName: {{firstName}}, LastName: {{lastName}}</view><view>FirstName: {{firstName}}, LastName: {{lastName}}</view>
</template><template is="staffName" data="{{...staffA}}"></template>
<template is="staffName" data="{{...staffB}}"></template>
<template is="staffName" data="{{...staffC}}"></template><view id="tapTest" data-hi="Weixin" data-meetingState="6" bindtap="tapName"> Click me! </view><button bindtap="a2b">a页面跳B页面</button>
<button bindtap="a2c">a页面跳C页面</button>

// pages/b/b.js
Page({/*** 页面的初始数据*/data: {},/*** 生命周期函数--监听页面加载*/onLoad(options) {console.log("b.onload");},/*** 生命周期函数--监听页面初次渲染完成*/onReady() {console.log("b.onReady");},/*** 生命周期函数--监听页面显示*/onShow() {console.log("b.onShow");},/*** 生命周期函数--监听页面隐藏*/onHide() {console.log("b.onHide");},/*** 生命周期函数--监听页面卸载*/onUnload() {console.log("b.onUnload");},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh() {},/*** 页面上拉触底事件的处理函数*/onReachBottom() {},/*** 用户点击右上角分享*/onShareAppMessage() {}
})

// pages/c/c.js
// import c from cs
Page({/*** 页面的初始数据*/data: {},c2b:function() {wx.switchTab({url:'/pages/b/b',})},c2d:function() {wx.navigateTo({url: '/pages/d/d',})},/*** 生命周期函数--监听页面加载*/onLoad(options) {console.log("c.onload");},/*** 生命周期函数--监听页面初次渲染完成*/onReady() {console.log("c.onReady");},/*** 生命周期函数--监听页面显示*/onShow() {console.log("c.onShow");},/*** 生命周期函数--监听页面隐藏*/onHide() {console.log("c.onHide");},/*** 生命周期函数--监听页面卸载*/onUnload() {console.log("c.onUnload");},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh() {},/*** 页面上拉触底事件的处理函数*/onReachBottom() {},/*** 用户点击右上角分享*/onShareAppMessage() {}
})

<!--pages/c/c.wxml-->
<text>pages/c/c.wxml</text>
<button bindtap="c2d">c页面跳d页面</button>
<button bindtap="c2b">c页面跳b页面</button>

// pages/d/d.js
Page({/*** 页面的初始数据*/data: {},/*** 生命周期函数--监听页面加载*/onLoad(options) {console.log("d.onload");},/*** 生命周期函数--监听页面初次渲染完成*/onReady() {console.log("d.onReady");},/*** 生命周期函数--监听页面显示*/onShow() {console.log("d.onShow");},/*** 生命周期函数--监听页面隐藏*/onHide() {console.log("d.onHide");},/*** 生命周期函数--监听页面卸载*/onUnload() {console.log("d.onUnload");},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh() {},/*** 页面上拉触底事件的处理函数*/onReachBottom() {},/*** 用户点击右上角分享*/onShareAppMessage() {}
})

结论：

一级不会销毁；

二级层级深跳到层级低的会销毁；

二级层级低级跳到深层级只会隐藏；

隔代中间所有页面会被销毁；