我想我的网页哔哔每当用户超过我的<textarea>的最大字符限制。
当前回答
注意:把这段代码放在你想要出现哔哔声的地方。 并且记住指定存储哔哔声的目录或文件夹(源)。
<script>
//Appending HTML5 Audio Tag in HTML Body
$('<audio id="chatAudio"><source src="sound/notify.ogg" type="audio/ogg"><source src="sound/notify.mp3" type="audio/mpeg"><source src="sound/notify.wav" type="audio/wav"></audio>').appendTo('body');
$('#chatAudio')[0].play();
</script>
参考:http://www.9lessons.info/2013/04/play-notification-sound-using-jquery.html。
我在我正在开发的社交媒体中实现了这一点，它的工作发现，聊天时像facebook一样的通知，通知你有一个新的聊天消息
其他回答
<html>
<head>
<script src='https://surikov.github.io/webaudiofont/npm/dist/WebAudioFontPlayer.js'></script>
<script src='https://surikov.github.io/webaudiofontdata/sound/0000_JCLive_sf2_file.js'></script>
<script>
var selectedPreset=_tone_0000_JCLive_sf2_file;
var AudioContextFunc = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContextFunc();
var player=new WebAudioFontPlayer();
player.loader.decodeAfterLoading(audioContext, '_tone_0000_JCLive_sf2_file');
</script>
</head>
<body>
<p><a href="#" onmousedown="player.queueWaveTable(audioContext, audioContext.destination, selectedPreset, 0, 55, 3.5);">Play a note</a></p>
<hr/>
<p><a href="https://github.com/surikov/webaudiofont">source</a></p>
</body>
听这里 https://jsbin.com/lamidog/1/edit?html,output
以下是我如何使用HTML5让它发出哔哔声: 首先我复制并将windows wav文件转换为mp3，然后我使用以下代码:
var _beep = window.Audio("Content/Custom/Beep.mp3")
function playBeep() { _beep.play()};
全局声明声音文件并在需要时引用它会更快。
/*if you want to beep without using a wave file*/
var context = new AudioContext();
var oscillator = context.createOscillator();
oscillator.type = "sine";
oscillator.frequency.value = 800;
oscillator.connect(context.destination);
oscillator.start();
// Beep for 500 milliseconds
setTimeout(function () {
oscillator.stop();
}, 100);
上面的答案在当时是正确的，但现在是错误的;你可以用纯javascript实现。但是使用javascript的一个答案不再有效，而其他答案非常有限或不使用纯javascript。
我做了我自己的解决方案，工作得很好，让你控制音量，频率和波型。
//if you have another AudioContext class use that one, as some browsers have a limit
var audioCtx = new (window.AudioContext || window.webkitAudioContext || window.audioContext);
//All arguments are optional:
//duration of the tone in milliseconds. Default is 500
//frequency of the tone in hertz. default is 440
//volume of the tone. Default is 1, off is 0.
//type of tone. Possible values are sine, square, sawtooth, triangle, and custom. Default is sine.
//callback to use on end of tone
function beep(duration, frequency, volume, type, callback) {
var oscillator = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
if (volume){gainNode.gain.value = volume;}
if (frequency){oscillator.frequency.value = frequency;}
if (type){oscillator.type = type;}
if (callback){oscillator.onended = callback;}
oscillator.start(audioCtx.currentTime);
oscillator.stop(audioCtx.currentTime + ((duration || 500) / 1000));
};
有人建议我编辑一下，说明它只适用于某些浏览器。然而，据我所知，所有现代浏览器似乎都支持Audiocontext。它在IE上不受支持，但微软已经停产了。如果您在特定的浏览器上有任何问题，请报告。
现在用JavaScript AudioContext API就很简单了。主要的桌面和移动网络浏览器完全支持它…
let context = null;
const beep = (freq = 520, duration = 200, vol = 100) => {
const oscillator = context.createOscillator();
const gain = context.createGain();
oscillator.connect(gain);
oscillator.frequency.value = freq;
oscillator.type = "square";
gain.connect(context.destination);
gain.gain.value = vol * 0.01;
oscillator.start(context.currentTime);
oscillator.stop(context.currentTime + duration * 0.001);
}
document.querySelector('button').addEventListener('click', function () {
context = new AudioContext();
beep();
});
我写了一个小应用程序，可以播放马里奥游戏中的音乐，不需要任何音频文件，只有运行时。在我看来，这很有趣，你可以看到源代码并听它。
该代码支持多个哔哔声的排序，以及频率的逐渐变化('ramp'标志)。下面给出了两个例子。
<script>
var audioContext = null;
var oscillatorNode = null;
var stopTime = 0;
function beep (frequency, durationSec, ramp=false)
{
if (oscillatorNode == null) {
audioContext = new (window.AudioContext || window.webkitAudioContext) ();
stopTime = audioContext.currentTime;
oscillatorNode = audioContext.createOscillator();
oscillatorNode.type = "sine";
oscillatorNode.connect (audioContext.destination);
if (ramp) {
oscillatorNode.frequency.setValueAtTime (frequency, stopTime);
}
oscillatorNode.start ();
oscillatorNode.onended = function() {
oscillatorNode = null;
audioContext = null;
}
}
if (ramp) {
oscillatorNode.frequency.linearRampToValueAtTime (frequency, stopTime); // value in hertz
} else {
oscillatorNode.frequency.setValueAtTime (frequency, stopTime); // value in hertz
}
stopTime += durationSec;
oscillatorNode.stop (stopTime);
}
function test1()
{
beep (250, 0.5);
beep (1000, 0.2);
beep (550, 0.5);
}
function test2()
{
beep (50, 2, true);
beep (5000, 2, true);
beep (50, 0, true);
}
</script>
<button onclick='test1()'>Beep!</button>
<button onclick='test2()'>Beep(ramped)!</button>
