效果如图：
背景图片可以换成自己喜欢的或者不用，线条的颜色粗细也可以自己调整。
代码如下（可直接复制使用）：
<html lang="en"> <head> <meta charset="UTF-8"> <title>可视化音频</title> <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> <style> body { display: block; background: url("./8.jpg"); background-position: center; background-repeat: no-repeat; background-attachment: fixed; background-size:100%; } </style> </head> <body> <input type="file" style="color:red;" name="" value="" id="musicFile"><input type="button" name="startStop" value="暂停" id="startStop"> <p id="tip" style="color:red;"></p> <canvas id="canvas"></canvas> <script> window.onload = function () { canvas.width = window.innerWidth; canvas.height = window.innerHeight; var canvasCtx = canvas.getContext("2d"); var AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext; var audioContext = new AudioContext();//实例化 $('#musicFile').change(function(){ //当选择歌曲时，判断当前audioContext的状态，如果在进行中则关闭音频环境， //释放audioContext的所有资源，并重新实例化audioContext if(audioContext.state == 'running'){ audioContext.close(); audioContext = new AudioContext(); } if (this.files.length == 0) return; var file = $('#musicFile')[0].files[0]; var fileReader = new FileReader(); fileReader.readAsArrayBuffer(file); fileReader.onload = function(e) { var count = 0; $('#tip').text('开始解码') var timer = setInterval(function(){ count++; $('#tip').text('解码中,已用时'+count+'秒') },1000) audioContext.decodeAudioData(e.target.result, function(buffer) { clearInterval(timer) $('#tip').text('解码成功，用时共计:'+count+'秒') var audioBufferSourceNode = audioContext.createBufferSource(); var analyser = audioContext.createAnalyser(); analyser.fftSize = 256; audioBufferSourceNode.connect(analyser); analyser.connect(audioContext.destination); audioBufferSourceNode.buffer = buffer; audioBufferSourceNode.start(); var bufferLength = analyser.frequencyBinCount; var dataArray = new Uint8Array(bufferLength); //播放暂停音频 startStop.onclick = function() { if(audioContext.state === 'running') { audioContext.suspend().then(function() { $("#startStop").val('播放'); }); } else if(audioContext.state === 'suspended') { audioContext.resume().then(function() { $("#startStop").val('暂停'); }); } } var oW = canvas.width; var oH = canvas.height; var color1 = canvasCtx.createLinearGradient(oW / 2, oH / 2-10, oW / 2, oH / 2 - 150); var color2 = canvasCtx.createLinearGradient(oW / 2, oH / 2+10, oW / 2, oH / 2 + 150); color1.addColorStop(0, '#1E90FF'); color1.addColorStop(.25, '#FF7F50'); color1.addColorStop(.5, '#8A2BE2'); color1.addColorStop(.75, '#4169E1'); color1.addColorStop(1, '#00FFFF'); color2.addColorStop(0, '#1E90FF'); color2.addColorStop(.25, '#FFD700'); color2.addColorStop(.5, '#8A2BE2'); color2.addColorStop(.75, '#4169E1'); color2.addColorStop(1, '#FF0000'); function draw() { drawVisual = requestAnimationFrame(draw); var barHeight; // 自定义获取数组里边数据的频步 canvasCtx.clearRect(0, 0, oW, oH); for (var i = 0; i < bufferLength; i++) { barHeight = dataArray[i]; analyser.getByteFrequencyData(dataArray); // 绘制向上的线条 canvasCtx.fillStyle = color1; /* context.fillRect(x,y,width,height) * x，y是坐标 * width，height线条的宽高 */ canvasCtx.fillRect(oW / 2 + (i * 8), oH / 2, 2, -barHeight); canvasCtx.fillRect(oW / 2 - (i * 8), oH / 2, 2, -barHeight); // 绘制向下的线条 canvasCtx.fillStyle = color2; canvasCtx.fillRect(oW / 2 + (i * 8), oH / 2, 2, barHeight); canvasCtx.fillRect(oW / 2 - (i * 8), oH / 2, 2, barHeight); } }; draw(); }) } }) } </script> </body></html>
总结
以上所述是小编给大家介绍的JS实现可视化音频效果的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！
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