javascript - 如何使用 JavaScript 设置函数参数？

Question

如何使用 JavaScript 设置函数参数？我需要为变量设置一个数值，但我似乎无法弄清楚。一些帮助将不胜感激!

            // create web audio api context
        var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

        // create Oscillator node
        var oscillator = audioCtx.createOscillator();
        oscillator.type = 'square';
        oscillator.frequency.setValueAtTime(255, audioCtx.currentTime); // I want to set 255 to the variable x
        oscillator.connect(audioCtx.destination);
        oscillator.start();
        var x = document.getElementById("HTMLslider").value;

我尝试过这样做:

set oscillator.frequency = var "x"

希望有人能帮忙😁

Answer 1

我猜您想根据 slider 值更改频率:

var slider = document.getElementById("HTMLslider");

// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

// create Oscillator node
var oscillator = audioCtx.createOscillator();
oscillator.type = 'square';
oscillator.frequency.setValueAtTime(Number(slider.value), audioCtx.currentTime); // I want to set 255 to the variable x
oscillator.connect(audioCtx.destination);
oscillator.start();

// Listen for slider changes and apply value to frequency.
slider.addEventListener('change', e => oscillator.frequency.setValueAtTime(Number(e.target.value), audioCtx.currentTime));

<input type="range" min="1" max="1000" value="225" id="HTMLslider" />