WeChat Mini Program Development Simple Tutorial 1

1. Obtain the AppID of the WeChat applet (Note that the AppID here is a special ID for the applet, which can be seen in the applet when logging into the WeChat official account. Without AppID, some functions will be restricted!）

Log in, and you can view the AppID of the WeChat applet in the "Settings" - "Developer Settings" of the website. Note that the AppID of the service account or subscription account cannot be used directly.

Note: If you want to experience the mini program on your mobile phone with a non-administrator WeChat ID, then we also need to operate "Bind Developer". That is, in the "User Identity"-"Developer" module, bind the WeChat ID you need to experience the mini program. By default, this tutorial uses the administrator's WeChat ID to register an account and experience.

2. Create a project (The name of the project is generally in English, try not to use Chinese, as an error may be reported)

We need to use developer tools to complete the mini program Creation and code editing.

After the developer tools are installed, open and use WeChat to scan the QR code to log in. Select Create "Project", fill in the AppID obtained above, set a local project name (not a mini program name), such as "My First Project", and select a local folder as the directory where the code is stored , just click "New Project".

In order to facilitate beginners to understand the basic code structure of the WeChat applet, during the creation process, if the selected local folder is an empty folder, the developer tool will prompt whether it is necessary to create a quick start project. Select "Yes" and the developer tools will help us generate a simple demo in the development directory.

After the project is successfully created, we can click on the project to enter and see the complete developer tools interface, click on the left navigation, and view it in "Edit" And edit our code, in "Debug" you can test the code and simulate the effect of the mini program on the WeChat client, and in "Project" you can send it to your mobile phone to preview the actual effect.

3. Write code (Mini programs have their own specific tags)

Create mini program instances

Click "" in the left navigation of developer tools Edit", we can see that this project has been initialized and contains some simple code files. The most critical and essential ones are app.js, app.json, and app.wxss. Among them, the .js suffix is ​​a script file, the .json suffix is ​​a configuration file, and the .wxss suffix is ​​a style sheet file. The WeChat applet will read these files and generate applet instances.

Let’s briefly understand the functions of these three files to facilitate modification and develop your own WeChat applet from scratch.

app.js is the script code of the mini program. We can monitor and process the life cycle functions of the applet and declare global variables in this file. Call the rich API provided by the framework, such as synchronous storage and synchronous reading of local data in this example. To learn more about the available APIs, please refer to the API document

//app.js
App({
  onLaunch: function () {//调用API从本地缓存中获取数据var logs = wx.getStorageSync('logs') || []
    logs.unshift(Date.now())
    wx.setStorageSync('logs', logs)
  },
  getUserInfo:function(cb){var that = this;if(this.globalData.userInfo){      typeof cb == "function" && cb(this.globalData.userInfo)
    }else{      //调用登录接口
      wx.login({
        success: function () {
          wx.getUserInfo({
            success: function (res) {
              that.globalData.userInfo = res.userInfo;              typeof cb == "function" && cb(that.globalData.userInfo)
            }
          })
        }
      });
    }
  },
  globalData:{
    userInfo:null
  }
})

app.json is the global configuration of the entire applet. In this file, we can configure which pages the mini program consists of, configure the window background color of the mini program, configure the navigation bar style, and configure the default title. Note that no comments can be added to this file. For more configurable items, please refer to the configuration details

{  "pages":["pages/index/index","pages/logs/logs"
  ],  "window":{"backgroundTextStyle":"light","navigationBarBackgroundColor": "#fff","navigationBarTitleText": "WeChat","navigationBarTextStyle":"black"
  }
}

app.wxss is the common style sheet for the entire applet. We can directly use the style rules declared in app.wxss on the class attribute of the page component.

/**app.wxss**/.container {  height: 100%;  display: flex;  flex-direction: column;  align-items: center;  justify-content: space-between;  padding: 200rpx 0;  box-sizing: border-box;
}

Create page

In this tutorial, we have two pages, the index page and the logs page, namely the welcome page and the display page of the mini program startup log. They are both in the pages directory. . The [path + page name] of each page in the WeChat mini program needs to be written in pages of app.json, and the first page in pages is the homepage of the mini program.

Each mini program page is composed of four different suffix files with the same name in the same path, such as: index.js, index.wxml, index.wxss, index.json. The file with the suffix .js is a script file, the file with the suffix .json is a configuration file, the file with the suffix .wxss is a style sheet file, .wxml The file with the suffix is ​​the page structure file.

index.wxml is the structure file of the page:

<!--index.wxml--><view class="container">  <view  bindtap="bindViewTap" class="userinfo"><image class="userinfo-avatar" src="{{userInfo.avatarUrl}}" background-size="cover"></image><text class="userinfo-nickname">{{userInfo.nickName}}</text>  </view>  <view class="usermotto"><text class="user-motto">{{motto}}</text>  </view></view>

In this example, <view/>, <image/># are used ##, to build the page structure, bind data and interactive processing functions.

//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() {
    wx.navigateTo({
      url: '../logs/logs'
    })
  },
  onLoad: function () {console.log('onLoad')var that = this//调用应用实例的方法获取全局数据
    app.getUserInfo(function(userInfo){      //更新数据
      that.setData({
        userInfo:userInfo
      })
    })
  }
})

/**index.wxss**/.userinfo {  display: flex;  flex-direction: column;  align-items: center;
}.userinfo-avatar {  width: 128rpx;  height: 128rpx;  margin: 20rpx;  border-radius: 50%;
}.userinfo-nickname {  color: #aaa;
}.usermotto {  margin-top: 200px;
}

页面的样式表是非必要的。当有页面样式表时，页面的样式表中的样式规则会层叠覆盖 app.wxss 中的样式规则。如果不指定页面的样式表，也可以在页面的结构文件中直接使用 app.wxss 中指定的样式规则。

index.json 是页面的配置文件：

页面的配置文件是非必要的。当有页面的配置文件时，配置项在该页面会覆盖 app.json 的 window 中相同的配置项。如果没有指定的页面配置文件，则在该页面直接使用 app.json 中的默认配置。

logs 的页面结构

<!--logs.wxml--><view class="container log-list">  <block wx:for="{{logs}}" wx:for-item="log"><text class="log-item">{{index + 1}}. {{log}}</text>  </block></view>

logs 页面使用 <block/> 控制标签来组织代码，在 <block/> 上使用 wx:for 绑定 logs 数据，并将 logs 数据循环展开节点

//logs.jsvar util = require('../../utils/util.js')
Page({
  data: {
    logs: []
  },
  onLoad: function () {this.setData({
      logs: (wx.getStorageSync('logs') || []).map(function (log) {return util.formatTime(new Date(log))
      })
    })
  }
})

运行结果如下：

4. 手机预览（加入开发者或者运营者可以生成二维码直接扫码进入！）

开发者工具左侧菜单栏选择"项目"，点击"预览"，扫码后即可在微信客户端中体验。

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