function webAudio(options){ //public this.volume = parseInt(options.volume || 100) ; // 音量控制单元，值为Number类型,范围为0-100 this.url = options.url || '' ; // 音频资源url，值类型为String类型 this.autoPlay = !!options.autoPlay; // 是否加载完成自动播放，值类型为Boolean类型 this.loopPlay = !!options.loopPlay; // 是否循环播放，值类型为Boolean类型 //private this.buffer = null; this.context = null; this.sourceAudio = null; this.gainNode = null; this.loadReady = false; //初始化 this.init = function () { window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext; if(!AudioContext){ console.error("您的浏览器不支持HTML5 audio API"); return } this.context = new AudioContext(); this.loadResource(); } //下载音频资源 this.loadResource = function () { var _this = this; var xhr = new XMLHttpRequest(); xhr.open('GET',this.url,true); xhr.responseType = 'arraybuffer'; xhr.onload = function () { _this.context.decodeAudioData(xhr.response,function (buffer) { _this.buffer = buffer; _this.prepareAudio(); this.loadReady = true; }) } xhr.send(); } //是否自动播放 this.prepareAudio = function () { this.autoPlay ? this.startAudio() : ''; } //创建音频 this.createAudio = function () { this.sourceAudio = this.context.createBufferSource();//创建一个音频源 相当于是装音频的容器 this.sourceAudio.buffer = this.buffer;// 告诉音频源 播放哪一段音频 this.gainNode = this.context.createGain();//调节音量 this.sourceAudio.connect(this.gainNode); this.changeVolume();//声音 this.sourceAudio.loop = this.loopPlay;//循环 this.gainNode.connect(this.context.destination);// 连接到输出源 } //重新播放 this.startAudio = function () { this.createAudio(); this.sourceAudio.start(0);//开始播放 } //改变音量 this.changeVolume = function (num) { num = num || 0; this.gainNode.gain.value = (this.volume += num) / 100; } //播放转为暂停 this.pauseAudio = function () { this.gainNode.disconnect(this.context.destination) } //暂停转为播放 this.playAudio = function () { this.gainNode.connect(this.context.destination) } //停止播放 this.stopAudio = function () { this.sourceAudio.stop() } //减小声音 this.decVolume = function () { if(this.volume >= 10){ this.changeVolume(-10); } } //增大声音 this.ascVolume = function () { if(this.volume <= 90){ this.changeVolume(10); } } //静音 this.quietVolume = function () { this.gainNode.gain.value = 0; } //静音恢复 this.recoverVolume = function () { this.changeVolume() } //当前音量 this.getVolume = function () { return (this.gainNode.gain.value).toFixed(2) * 100; } this.init(); return this; } window.test = new webAudio({ volume:100, url:'1.mp3', autoPlay:true, loopPlay:true }); //控制台事件 var pauseEle = document.getElementById("pause"); pauseEle.onclick = function() { if (pauseEle.alt === 'Pause') { test.pauseAudio(); } else { test.playAudio(); } }增加播放暂停图片切换

可以将HTML代码中的播放暂停按钮的img标签的src属性设为一个变量，然后在JavaScript中根据当前状态切换该变量的值，从而实现图片切换。例如，可以在JavaScript中添加一个togglePlayPause函数：

function togglePlayPause() {
  var playPauseButton = document.getElementById("play-pause-button");
  if (playPauseButton.src === "play.png") {
    playPauseButton.src = "pause.png";
  } else {
    playPauseButton.src = "play.png";
  }
}

并在createAudio函数中调用该函数：

this.createAudio = function () {
  this.sourceAudio = this.context.createBufferSource();
  this.sourceAudio.buffer = this.buffer;
  this.gainNode = this.context.createGain();
  this.sourceAudio.connect(this.gainNode);
  this.changeVolume();
  this.sourceAudio.loop = this.loopPlay;
  this.gainNode.connect(this.context.destination);
  togglePlayPause();
}

这样，每次播放或暂停音频时，都会切换播放暂停按钮的图片。需要在HTML代码中给该按钮添加一个id属性为"play-pause-button"，并将src属性设为默认的播放按钮图片路径。