微信小程序 第三章 “音乐”小程序项目

已经更新，可以在手机上进行调试

1. 图片利用图床生成在线链接
2. 网易云音乐MP3地址为http://music.163.com/song/media/outer/url?id= ？.mp3
   

学习目标

1. 掌握swiper组件的使用
2. 掌握scroll-view组件的使用
3. 掌握image组件的使用
4. 掌握slider组件的使用
5. 掌握音频API的使用

具体使用请看微信开发文档

开发前准备

项目展示

---

项目分析

页面结构

• 页面由上、中、下三个区域组成（tab，content，player）
• content通过左右滑动可以实现标签页的转换
• 音乐推荐向用户推荐热门音乐
• 播放器显示当前播放进度，用户可以跳转进度
• 播放列表显示当前播放的曲目列表，用户可以进行曲目切换
• player三个按钮 打开播放列表 播放暂停 切换到下一曲

---

目录结构

---

标签页切换–index页面

<view class="tab">
  <view class="tab-item {{tab==0?'active':''}}" bindtap="changeItem" data-item="0">音乐推荐view>
  <view class="tab-item {{tab==1?'active':''}}" bindtap="changeItem" data-item="1">播放器view>
  <view class="tab-item {{tab==2?'active':''}}" bindtap="changeItem" data-item="2">播放列表view>
view>

<view class="content">
  <swiper current="{{item}}" bindchange="changeTab">
    <swiper-item><include src="info.wxml">include>swiper-item>
    <swiper-item><include src="play.wxml">include>swiper-item>
    <swiper-item><include src="playlist.wxml">include>swiper-item>
  swiper>
view>

<view class="player">
  <image class="player-cover" src="{{play.coverImgUrl}}"/>
  <view class="player-info">
    <view class="player-info-title">{{play.title}}view>
    <view class="player-info-singer">{{play.singer}}view>
  view>
  <view class="player-controls">
    
    <image src="../images/01.png" bindtap="changePage" data-page="2" />
    
    <image wx:if="{{state=='paused'}}" src="../images/02.png" bindtap="play" />
    <image wx:else src="../images/02stop.png" bindtap="pause" />
    
    <image src="../images/03.png" bindtap="next"/>
  view>
view>

---

音乐推荐

<scroll-view class="content-info" scroll-y>
  
  <swiper class="content-info-slide" indicator-color="rgba(255,255,255,0.5)" indicator-active-color="#fff" indicator-dots autoplay>
    <swiper-item><image src="../images/b1.jpg" />swiper-item>
    <swiper-item><image src="../images/b2.jpg" />swiper-item>
    <swiper-item><image src="../images/b3.jpg" />swiper-item>
  swiper>
  
  <view class="content-info-portal">
    <view><image src="../images/04.png" /><text>私人FMtext>view>
    <view><image src="../images/05.png" /><text>每日歌曲推荐text>view>
    <view><image src="../images/06.png" /><text>云音乐新歌榜text>view>
  view>
  
  <view class="content-info-list">
    <view class="list-title">推荐歌曲view>
    <view class="list-inner">
      <view wx:if="{{index<6}}" wx:for="{{playlist}}" wx:key="id" bindtap="change" data-index="{{index}}" class="list-item">
        <image src="{{item.coverImgUrl}}">image>
        <view>{{item.title}}view>
      view>
  view>
scroll-view>

---

播放器页面

<view class="content-play">
  
  <view class="content-play-info">
    <text>{{play.title}}text>
    <view>——  {{play.singer}}  ——view>
  view>
  
  <view class="content-play-cover">
    <image src="{{play.coverImgUrl}}" style="animation-play-state:{{state}}" />
  view>
  
  <view class="content-play-progress">
    <text>{{play.currentTime}}text>
    <view><slider bindchange="sliderChange" activeColor="#d33a31" block-size="12" backgroundColor="#dadada" value="{{play.percent}}" />view>
    <text>{{play.duration}}text>
  view>
view>

---

播放列表

<scroll-view class="content-playlist" scroll-y>
  <view class="playlist-item" wx:for="{{playlist}}" wx:key="id" bindtap="change" data-index="{{index}}">
    <image class="playlist-cover" src="{{item.coverImgUrl}}" />
    <view class="playlist-info">
      <view class="playlist-info-title">{{item.title}}view>
      <view class="playlist-info-singer">{{item.singer}}view>
    view>
    <view class="playlist-controls">
      <text wx:if="{{index==playIndex}}">正在播放text>
    view>
  view>
scroll-view>

---

逻辑文件index.js

data数据

data: {
    item:0,
    tab:0,
    playlist:[
    {id:1,title:'有何不可',singer:'许嵩',src:'/pages/mp3/1.mp3',coverImgUrl:'../images/m1.jpg'},
    {id:2,title:'Love Story',singer:'Taylor swift',src:'/pages/mp3/2.mp3',coverImgUrl:'../images/m2.jpg'},
    {id:3,title:'无人之岛(Cover 任然)',singer:'鸣小明',src:'/pages/mp3/3.mp3',coverImgUrl:'../images/m3.jpg'},
    {id:4,title:'云烟成雨',singer:'房东的猫',src:'/pages/mp3/4.mp3',coverImgUrl:'../images/m4.jpg'},
    {id:5,title:'小幸运',singer:'刘烨',src:'/pages/mp3/5.mp3',coverImgUrl:'../images/m5.jpg'},
    {id:6,title:'理想三旬',singer:'陈鸿宇',src:'/pages/mp3/6.mp3',coverImgUrl:'../images/m6.jpg'}
    ],
    state:'paused',
    playIndex:0,
    play:{currentTime:'00:00',duration:'00:00',percent:0,title:'',singer:'',coverImgUrl:'../images/m1.jpg'}
},
//音频对象
audioCtx:null

---

函数

//tab绑定事件--滑动content
changeItem:function(e){this.setData({item:e.target.dataset.item})},
//content swiper绑定事件 改变tab
changeTab:function(e){this.setData({tab:e.detail.current})},
//加载页面时执行
onReady:function(){
  this.audioCtx = wx.createInnerAudioContext();
  var that=this;
  // 播放失败检测
  this.audioCtx.onError(function(){console.log('播放失败：'+that.audioCtx.src);})
  // 播放完成自动换下一曲
  this.audioCtx.onEnded(function(){that.next();})
  // 自动更新播放速度
  this.audioCtx.onPlay(function(){})
  this.audioCtx.onTimeUpdate(function(){
    that.setData({
      'play.currentTime':that.formatTime(that.audioCtx.currentTime),
      'play.duration':that.formatTime(that.audioCtx.duration),
      'play.percent':that.audioCtx.currentTime/that.audioCtx.duration*100
    })
  })
  // 默认第一曲
  this.setMusic(0);
},
// 格式化时间
formatTime:function(time){
  var minute=Math.floor(time/60)%60;
  var second=Math.floor(time)%60;
  return (minute<10?'0'+minute:minute)+":"+(second<10?'0'+second:second)
},
//根据index切换当前播放曲目
setMusic:function(index){
  var music=this.data.playlist[index];
  this.audioCtx.src=music.src;
  this.setData({playIndex:index,'play.title':music.title,'play.singer':music.singer,'play.coverImgUrl':music.coverImgUrl,'play.currentTime':'00:00','play.duration':'00:00','play.percent':0})
},
//切换到播放列表
changePage:function(e){
  this.setData({
    item:e.currentTarget.dataset.page,
    tab:e.currentTarget.dataset.page
  })
},
//播放曲目
play:function(){
  this.audioCtx.play();
  this.setData({state:'running'})
},
//暂停曲目
pause:function(){
  this.audioCtx.pause();
  this.setData({state:'paused','play.duration':this.formatTime(this.audioCtx.duration)})
},
//播放下一首
next:function(){
  var index=this.data.playIndex>=this.data.playlist.length-1?0:this.data.playIndex+1;
  this.setMusic(index);
  this.forward(0);//此处请看下面的format函数
},
//改变进度条，改变当时播放时长
sliderChange:function(e){
  var second=e.detail.value*this.audioCtx.duration/100;
  this.forward(second);//此处请看下面的format函数
},
//单击播放列表，改变播放曲目
change:function(e){
  this.setMusic(e.currentTarget.dataset.index);
  this.forward(0);//此处请看下面的format函数
},

---

本人的bug

由于InnerAudioContext.seek 跳转时长不会更新,请看开发文档解决

forward:function(second){
  this.audioCtx.pause();// 先暂停
  this.audioCtx.seek(second);// 再跳转
  setTimeout(() => {this.play();}, 500);// 延时播放
})

由于路径播放不成功问题，请看路径问题使用绝对路径