如何使用 JavaScript 設置函數參數？

Question

如何使用 JavaScript 設置函數參數？ 我需要為變量設置一個數值，但我似乎無法弄清楚。 一些幫助將不勝感激！

            // 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;

我試過這樣做：

set oscillator.frequency = var "x"

希望有人能幫忙😁

Answer 1

我猜您想根據滑塊值更改頻率：

 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" />