How to apply for WeChat applet development steps

How to apply for WeChat applet _ WeChat applet development tutorial, etc. In the past year, WeChat applet has finally been officially released. For developers and friends, you can apply to create your own applet in the future. So how to apply for WeChat applet? The following small series will share in detail the actual development tutorial of a WeChat applet from scratch, hoping that the operation steps will be helpful to the initial developers.

development steps of wechat applet

preparation before wechat applet application:

first, you need to register an applet account. You need to register with an email address that has not been registered in WeChat official account. The registration process requires a lot of authentication, which is complicated. If you just test the water for the time being and have no plans to publish it, you only need to fill in the basic information, and you don't need to complete WeChat authentication.

after that, you can log in with your registered account on the public platform.

then, click settings in the list on the left of the main page, and then select development settings in the settings page to see AppID. AppID can be used to register in the development tool and use the advanced functions of the development tool. You can download the development tools in official website.

Start a project:

Open the developer tool, select the applet option, and then click the "Add Project" button directly. In this step, we can fill in the AppID used when we just registered.

if the file in the project directory is an empty folder, you will be prompted whether to create a quick start project.

if you select "yes", the developer tool will help us generate a simple Demo in the development directory.

this Demo has a general framework of a complete applet.

1. Framework

First, let's take a look at the official Demo directory:

app.js: applet logic, life cycle, global variables.

app.json: applet public settings, navigation bar color, etc., and cannot be commented.

app.wxss: The applet is in a * * * style, similar to CSS.

The composition of applet pages is similar to this:

Each applet page is composed of four different suffix files with the same name under the same path, such as: index.js, index.wxml, index.wxss, index.json

The path and page file name of each page in WeChat applet need to be written in pages of app.json, and the first one in the pages array.

these four files can be divided into three parts according to their functions:

configuration: json file

logic layer: js file

view layer: wxss.wxml file

on iOS, the logic code of applet runs in JavaScriptCore, while on Android, this task is handed over to X5 kernel.

on the development tool, the JavaScript code of the applet runs in NW.js(Chrome kernel). This also leads to the difference between the effect of development tools and the actual effect.

2. Components

WeChat provides many components, which are mainly divided into eight types:

Among them, it includes common components such as view, scroll-view, button and form, and also provides mapcanvas

components, which mainly belong to the view layer, and are structured and laid out through WXML, similar to HTML. Styles are defined and modified by WXSS, and its syntax and usage are similar to CSS.

Examples of syntax used by components:

3. API

Network

Media

Data

Device

Interface

Development Interface

The network request interface contains common HTTPS requests and supports uploading, downloading and Socket, which basically meets the network requirements we need in development.

these APIs belong to the logic layer and are written in the JS logic file.

use example:

wx.getLocation({ type: 'wgs84', Success: function (res) {var latitude = res.latitude var longitude = res.longitude var speed = res.speed var accuracy = res.accuracy}})

You can check the usage of other APIs in the official document–API.

compile and run

1. Simulator debugging

We can use the simulator to check the effect of applet running in the developer tools provided by WeChat.

As we mentioned before, the applet runs at a different bottom level, which also leads to the effect on the simulator, which is somewhat different from that on the mobile phone.

2. real machine debugging

in the option bar on the left, select an item, and then click preview to produce a QR code. You can see the actual effect on the real machine by scanning it with the administrator's micro signal.

actual combat: running applet

screenshot of real machine running (running on iPhone 7, WeChat version: 6.3.31):

First, realize a timer to time, get coordinates through wx.getLocation, store the obtained coordinates in an array, get mileage through coordinates at regular intervals, accumulate to get the total mileage, and also connect through coordinate points. Existing problems:

Because there is no way to draw lines on the map at present, little red dot map is pasted on the map to show the approximate running path, which is rough;

although the Martian coordinate GCJ12 in API is adopted, the obtained coordinates are similar to the international coordinates, and there are still deviations.

I've put all the code on GitHub, so you can download it or Star it first, and I'll make some optimization updates in the future. Now it's just a learning Demo. Everyone communicates and learns, and the practical application needs more optimization.

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