如何使用 SoundJS 切换 play/pause？

Question

我正在使用 SoundJS 构建伪 MPC。我已经按照我想要的方式对声音套件按钮进行了编程，但是我无法让循环按照我想要的方式工作。

我希望用户点击 "loop1" 即可播放。
如果用户再次点击 "loop1"，它应该停止并重新设置。
如果用户在 "loop1" 正在播放时单击 "loop2"，则 "loop1" 会在 "loop2" 开始播放时停止并重置。

我怎么能掌握这个问题。警告，我本质上是一名 UI/UX 设计师并且仍在学习 Javascript，所以如果您在解释时能给我更多细节，那就太好了。谢谢！

下面是我的一些代码，但要查看实际效果，请查看此处：http://nowthatsgenius.com/clients/beatbox/

<body onload="init();">
    <section class="player-container">
        <article class="player-controls">
            <ul class="player-controls">
                <li class="player-controls-button" id="loop1" onclick="playSound(this)">Loop 1</li>
                <li class="player-controls-button" id="loop2" onclick="playSound(this)">Loop 2</li>
            </ul>
        </article>
    </section>
    <section class="mpc-container">
        <article class="mpc-title mpc-col">
            <span class="text">V1</span>
        </article>
        <article class="mpc-controls mpc-col">
            <ul class="mpc-controls-wrap">
                <li class="mpc-controls-row">
                    <ul>
                        <li class="mpc-controls-button" id="a1" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a2" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a3" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a4" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a5" onclick="playSound(this)"></li>
                    </ul>
                    <ul>
                        <li class="mpc-controls-button" id="a6" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a7" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a8" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a9" onclick="playSound(this)"></li>
                        <li class="mpc-controls-button" id="a10" onclick="playSound(this)"></li>
                    </ul>
                </li>
            </ul>
        </article>
    </section>

    <script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
    <script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
    <script src="http://code.createjs.com/soundjs-0.6.0.min.js"></script>
    <script>
        var preload;

        function init() {
            if (!createjs.Sound.initializeDefaultPlugins()) {
                document.getElementById("error").style.display = "block";
                document.getElementById("content").style.display = "none";
                return;
            }

            var assetsPath = "assets/";
        var sounds = [
                {id:"loop1", src:"loop1.mp3"},
                {id:"loop2", src:"loop2.mp3"},

            {id:"a1", src:"snare.wav"},
            {id:"a2", src:"kick1.wav"},
            {id:"a3", src:"clap1.wav"},
            {id:"a4", src:"closedhat.wav"},
            {id:"a5", src:"cymbal.wav"},
            {id:"a6", src:"kick2.wav"},
            {id:"a7", src:"clap2.wav"},
            {id:"a8", src:"openhat.wav"},
            {id:"a9", src:"voice1.wav"},
            {id:"a10", src:"voice2.wav"},
        ];

        $('.player-controls-button').attr("disabled",true);

        createjs.Sound.alternateExtensions = ["mp3"];   
        createjs.Sound.addEventListener("fileload", createjs.proxy(handleLoadComplete, this));
        createjs.Sound.registerSounds(sounds, assetsPath);
      }


        function playSound(target) {

            var instance = createjs.Sound.play(target.id, createjs.Sound.INTERRUPT_NONE);

            $(".player-controls-button").click(function(event) {
                if (instance.playState == createjs.Sound.PLAY_SUCCEEDED) {
                    instance.stop();
                } 
                else {
                    instance.play(target.id, createjs.Sound.INTERRUPT_NONE);
                }
            });

            console.log(instance.playState);
        }


    </script>

</body>

Answer 1

您可以在开始播放声音后通过将它们分配给变量来修改声音。在这种情况下，我创建了变量 loop1 和 loop2.

// Creating variables outside playSound() so they exist in the global scope.
var loop1 = null;
var loop2 = null;

function playSound(target) {
    if(loop1){  // If loop1 exists, stop it.
        loop1.stop();
    }
    if(loop2){  // If loop2 exists, stop it.
        loop2.stop();
    }


    if(target.id == "loop1"){
        // Assign value to var loop1
        loop1 = createjs.Sound.play(target.id, createjs.Sound.INTERRUPT_NONE);
    }
    else if(target.id == "loop2"){
        // Assign value to var loop2
        loop2 = createjs.Sound.play(target.id, createjs.Sound.INTERRUPT_NONE);
    }
    else{
        // Otherwise, create generic sound
        var instance = createjs.Sound.play(target.id, createjs.Sound.INTERRUPT_NONE);
    }

    $(".player-controls-button").click(function(event) {
        if (instance.playState == createjs.Sound.PLAY_SUCCEEDED) {
            instance.stop();
        }else {
            instance.play(target.id, createjs.Sound.INTERRUPT_NONE);
        }
    });

    console.log(instance.playState);
}

我建议您将音效的 playSound(target) 函数分开，并为您的音乐循环创建一个名为 playLoop(target) 的新函数，以使其更易于阅读。但这取决于你。

版本 2

var loop1 = null;
var loop2 = null;
function playLoop(target){

    // If loop1 exists, stop it and delete it
    if(loop1){
        loop1.stop();
        loop1 = null;
    }else if(target.id == "loop1"){
        loop1 = createjs.Sound.play(target.id, createjs.Sound.INTERRUPT_NONE);
    }

    // If loop2 exists, stop it and delete it
    if(loop2){
        loop2.stop();
        loop2 = null;
    }else if(target.id == "loop2"){
        loop2 = createjs.Sound.play(target.id, createjs.Sound.INTERRUPT_NONE);
    }
}

当您将 createjs.Sound.play() 分配给一个变量时，该变量将成为一个 AbstractSoundInstance 对象。您可以通过许多很酷的方式修改它，here's the documentation 如果您想了解您可以使用这些变量做些什么。

如何使用 SoundJS 切换 play/pause？

How do I toggle play/pause with SoundJS?

javascript

soundjs