可以直接复制到txt文件中，然后将后缀名改成html，拖到Edge浏览器或别的标准浏览器中运行。
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"></head>
<body></body>
<script>
/*
作者：香江鱼@哔喱哔喱；香江鱼@*今条头日**
*/
let canvas,ctx,actx,osc,gain
window.onload = function(){
main()
}
function main(){
document.body.style.backgroundColor = 'gray'
canvas = document.createElement('canvas')
document.body.appendChild(canvas)
canvas.style.backgroundColor = 'white'
canvas.width = 1200
canvas.height = 600
ctx = canvas.getContext('2d')
ctx.globalAlpha = 0.1
canvas.onmousedown = function(e){
if(!actx) initAudio()
canvas.down = true
playAndDraw(e)
}
canvas.onmousemove = function(e){
if(canvas.down) playAndDraw(e)
}
canvas.onmouseup = canvas.onmouseleave = function(e){
canvas.down = false
if(gain) stop()
}
}
function playAndDraw(e){
play(880*(1-e.offsetY/canvas.height),0.95 - e.offsetX/canvas.width)
ctx.fillRect(e.offsetX-5,e.offsetY-5,10,10)
}
function initAudio(){
actx = new AudioContext()
osc = actx.createOscillator()
osc.type = 'square'
gain = actx.createGain()
osc.connect(gain)
gain.connect(actx.destination)
gain.gain.setValueAtTime(0,actx.currentTime)
osc.start()
}
function play(fre,g){
console.log(fre,g)
osc.frequency.setValueAtTime(fre,actx.currentTime)
gain.gain.setValueAtTime(g>0?g/2:0,actx.currentTime)
}
function stop(){
gain.gain.setValueAtTime(0,actx.currentTime)
}
</script>
</html> 作者：香江鱼 https://www.bilibili.com/read/cv16372495 出处：bilibili