微信小程序实现树莓派（raspberry pi）小车控制

//index.js
//获取应用实例
const app = getApp()
 
Page({
 data: {
 logo: "/res/rasp-logo.png",
 wele: "欢迎使用树莓小车",
 enterBtn: "进入",
 PromoteMsg: "Please enter the server address (eg: http://x.x.x.x:8080)",
 reqURL: ""
 },
 // 从输入框中获取用户输入的服务器地址信息
 getURL: function (e) {
 this.setData({
 reqURL: e.detail.value
 })
 },
 enterClicked: function (e) {
 /
  当按下进入按钮，需要做以下事情
  1. 判断用户是否已经在输入框中输入完整的服务器地址
  2. 发起一个到服务器的GET请求，并分析服务器的响应结果
  3. 跳转到小车控制界面
 /
 console.log(this.data.reqURL)
 
 if (this.data.reqURL == '') {
 wx.showModal({
 title: '提示',
 content: '请先输入正确的服务器地址！',
 })
 return
 }
 
 // 发起到服务器的GET请求
 wx.request({
 url: this.data.reqURL,
 suess: function (res) {
 // 在这里获取POST请求地址，以及视频流地址，然后赋值给全局变量，供control页面调用
 console.log(res.data.match(/url = \"(\S)\"/)[1])
 console.log(res.data.match(/src=\"(\S)\"/)[1])
 app.globalData.postURL = res.data.match(/url = \"(\S)\"/)[1]
 app.globalData.cameraURL = res.data.match(/src=\"(\S)\"/)[1]
 
 // 跳转到control页面
 wx.navigateTo({
  url: '/pages/control/control',
 })
 },
 fail: function(res) {
 wx.showModal({
  title: '提示',
  content: '请检查输入的服务器地址！',
 })
 }
 })
 }
})

<!--index.wxml-->
<view>
 <view class="wele">
 <view class="logo">
 <image style="width: 250rpx; height: 250rpx" src="{{logo}}"></image>
 </view>
 <view>
 <text class="words">{{wele}}</text>
 </view>
 </view>
 
 <input class="requestURL" type="text" placeholder="{{PromoteMsg}}" focus='1' cursor='10' confirm-type="done" bindinput='getURL'></input>
 <button class='enter' bindtap='enterClicked'>{{enterBtn}}</button>
</view>

/index.wxss/
.wele{
 display: flex;
 margin-: 50rpx;
 flex-direction: column;
 align-items: center;
 justify-content: space-between;
}
 
.requestURL{
 margin: 50rpx 10rpx 30rpx 10rpx;
 border: 1px solid gray;
 font-style: italic;
 font-size: small
}
 
.enter{
 margin-right: 10rpx;
 width: 150rpx;
 height: 60rpx;
 font-size: small
}

// pages/control/control.js
const app = getApp()
 
Page({
 
 /
  页面的初始数据
 /
 data: {
 // Car control images
 "forwardBtn": "/res/forward.png",
 "leftBtn": "/res/left.png",
 "rightBtn": "/res/right.png",
 "backLeftBtn": "/res/back-left.png",
 "backRightBtn": "/res/back-right.png",
 "backBtn": "/res/backward.png",
 
 // Camera control images
 "upBtn": "/res/forward.png",
 "camLeftBtn": "/res/camLeft.png",
 "camRightBtn": "/res/camRight.png",
 "downBtn": "/res/backward.png",
 "resetBtn": "/res/reset.png"
 },
 
 carMove: function(event) {
 wx.request({
 url: this.data.postURL,
 data: event.currentTarget.dataset.direction,
 method: "POST",
 suess: function(res){
 
 },
 fail: function(res){
 
 }
 })
 },
 
 carS: function(event) {
 wx.request({
 url: this.data.postURL,
 data: "S",
 method: "POST",
 suess: function (res) {
 
 },
 fail: function (res) {
 
 }
 })
 },
 
 camMove: function(event) {
 wx.request({
 url: this.data.postURL,
 data: event.currentTarget.dataset.direction,
 method: "POST",
 suess: function (res) {
 
 },
 fail: function (res) {
 
 }
 })
 },
 
 /
  生命周期函数--监听页面加载
 /
 onLoad: function (options) {
 //this.data.cameraURL = app.globalData.cameraURL
 this.setData({
 cameraURL: app.globalData.cameraURL,
 postURL: app.globalData.postURL
 })
 console.log(this.data.cameraURL)
 console.log("post url in control page: " + app.globalData.postURL)
 },
 
 /
  生命周期函数--监听页面初次渲染完成
 /
 onReady: function () {
 
 },
 
 /
  生命周期函数--监听页面显示
 /
 onShow: function () {
 //console.log(wx.getSystemInfoSync().windowWidth)
 //console.log(wx.getSystemInfoSync().windowHeight)
 },
 
 /
  生命周期函数--监听页面隐藏
 /
 onHide: function () {
 
 },
 
 /
  生命周期函数--监听页面卸载
 /
 onUnload: function () {
 
 },
 
 /
  页面相关事件处理函数--监听用户下拉动作
 /
 onPullDownRefresh: function () {
 
 },
 
 /
  页面上拉触底事件的处理函数
 /
 onReachBottom: function () {
 
 },
 
 /
  用户点击右上角分享
 /
 onShareAppMessage: function () {
 
 }
})

{
 "navigationBarBackgroundColor": "#ffffff",
 "navigationBarTextStyle": "black",
 "navigationBarTitleText": "树莓小车",
 "backgroundColor": "#eeeeee",
 "backgroundTextStyle": "light",
 "enablePullDownRefresh": false,
 "navigationStyle": "custom",
 "disableScroll": true
}

<!--pages/control/control.wxml-->
<view class='control'>
 <!-- This image shows the camera view -->
 <image class='cameraView' src='http://192.168.1.104:8080/?action=stream' style="z-index:1"></image>
 
 <!-- The following six images control the car move -->
 <image class='button' id='forward' src='{{forwardBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='F' bindtouchend='carS'></image>
 <image class='button' id='left' src='{{leftBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='L' bindtouchend='carS'></image>
 <image class='button' id='right' src='{{rightBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='R' bindtouchend='carS'></image>
 <image class='button' id='backLeft' src='{{backLeftBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='BL' bindtouchend='carS'></image>
 <image class='button' id='backRight' src='{{backRightBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='BR' bindtouchend='carS'></image>
 <image class='button' id='back' src='{{backBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='B' bindtouchend='carS'></image>
 
 <!-- The following images control the camera move -->
 <image class='button' id='up' src='{{upBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='VU'></image>
 <image class='button' id='camLeft' src='{{camLeftBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='HL'></image>
 <image class='button' id='camRight' src='{{camRightBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='HR'></image>
 <image class='button' id='down' src='{{downBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='VD'></image>
 <image class='button' id='reset' src='{{resetBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='RESET'></image>
</view>

/ pages/control/control.wxss /
 
.control {
 width: 100%;
 height: 100%;
 transform: rotate(90deg);
 background-color: #eee;
 justify-content: center;
}
 
.cameraView {
 margin-left: 0px;
 width: 603px;
 height: 375px;
 background-color: #eee;
 justify-content: center;
}
 
.button {
 height: 60px;
 width: 60px;
 opacity: 0.3;
}
 
#forward {
 left: 60px;
 : 135px;
}
 
#left {
 left: 0px;
 : 195px;
}
 
#right {
 left: 120px;
 : 195px;
}
 
#backLeft {
 left: 0px;
 : 255px;
}
 
#backRight {
 left: 120px;
 : 255px;
}
 
#back {
 left: 60px;
 : 315px;
}
 
#up {
 left: 480px;
 : 195px;
}
 
#camLeft {
 left: 420px;
 : 255px;
}
 
#camRight {
 left: 540px;
 : 255px;
}
 
#down {
 left: 480px;
 : 315px;
}
 
#reset{
 left: 480px;
 : 135px
}

//app.js
App({
 onLaunch: function () {
 // 展示本地存储能力
 var logs = wx.getStorageSync('logs') || []
 logs.unshift(Date.now())
 wx.setStorageSync('logs', logs)
 
 // 登录
 wx.login({
 suess: res => {
 // 发送 res.code 到后台换取 openId, sessionKey, unionId
 }
 })
 // 获取用户信息
 wx.getSetting({
 suess: res => {
 if (res.authSetting['scope.userInfo']) {
  // 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框
  wx.getUserInfo({
  suess: res => {
  // 可以将 res 发送给后台解码出 unionId
  this.globalData.userInfo = res.userInfo
 
  // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
  // 所以此处加入 callback 以防止这种情况
  if (this.userInfoReadyCallback) {
  this.userInfoReadyCallback(res)
  }
  }
  })
 }
 }
 })
 },
 globalData: {
 userInfo: null,
 postURL: null,
 cameraURL: null
 }
})

{
 "pages": [
 "pages/index/index",
 "pages/control/control"
 ],
 "window": {
 "backgroundTextStyle": "light",
 "navigationBarBackgroundColor": "#fff",
 "navigationBarTitleText": "树莓小车",
 "navigationBarTextStyle": "black",
 "showStatusBar": false
 }
}

/app.wxss/
.container {
 height: 100%;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: space-between;
 padding: 200rpx 0;
 box-sizing: border-box;
} 
project.control.json:
{
 "description": "项目配置文件。",
 "packOptions": {
 "ignore": []
 },
 "setting": {
 "urlCheck": false,
 "es6": true,
 "postcss": true,
 "minified": true,
 "newFeature": true
 },
 "pileType": "miniprogram",
 "libVersion": "2.0.4",
 "appid": "wx18414b9f85bfc895",
 "projectname": "wechat-control",
 "isGameTourist": false,
 "condition": {
 "search": {
 "current": -1,
 "list": []
 },
 "conversation": {
 "current": -1,
 "list": []
 },
 "game": {
 "currentL": -1,
 "list": []
 },
 "miniprogram": {
 "current": -1,
 "list": []
 }
 }
}