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
这在JavaScript中是不可能直接实现的。您需要在HTML中嵌入一个简短的WAV文件,然后通过代码播放该文件。
一个例子:
<script>
function PlaySound(soundObj) {
var sound = document.getElementById(soundObj);
sound.Play();
}
</script>
<embed src="success.wav" autostart="false" width="0" height="0" id="sound1"
enablejavascript="true">
然后从JavaScript代码中调用它,如下所示:
PlaySound("sound1");
这应该完全是你想要的-你只需要自己找到/创建哔哔声,这应该是微不足道的。
其他回答
function Sound(url, vol, autoplay, loop)
{
var that = this;
that.url = (url === undefined) ? "" : url;
that.vol = (vol === undefined) ? 1.0 : vol;
that.autoplay = (autoplay === undefined) ? true : autoplay;
that.loop = (loop === undefined) ? false : loop;
that.sample = null;
if(that.url !== "")
{
that.sync = function(){
that.sample.volume = that.vol;
that.sample.loop = that.loop;
that.sample.autoplay = that.autoplay;
setTimeout(function(){ that.sync(); }, 60);
};
that.sample = document.createElement("audio");
that.sample.src = that.url;
that.sync();
that.play = function(){
if(that.sample)
{
that.sample.play();
}
};
that.pause = function(){
if(that.sample)
{
that.sample.pause();
}
};
}
}
var test = new Sound("http://mad-hatter.fr/Assets/projects/FreedomWings/Assets/musiques/freedomwings.mp3");
test.play();
http://jsfiddle.net/sv9j638j/
/*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。
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。
没有跨浏览器的方法来实现这纯javascript。相反,您可以使用一个小的.wav文件,使用嵌入或对象标记播放。
function beep(wavFile){
wavFile = wavFile || "beep.wav"
if (navigator.appName == 'Microsoft Internet Explorer'){
var e = document.createElement('BGSOUND');
e.src = wavFile;
e.loop =1;
document.body.appendChild(e);
document.body.removeChild(e);
}else{
var e = document.createElement('AUDIO');
var src1 = document.createElement('SOURCE');
src1.type= 'audio/wav';
src1.src= wavFile;
e.appendChild(src1);
e.play();
}
}
适用于Chrome,IE,Mozilla使用Win7操作系统。 需要服务器上的beep.wav文件。