SVGFEGaussianBlurElement：setStdDeviation() 方法

setStdDeviation(x, y)

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="gaussian-blur-filter">
      <feGaussianBlur
        in="SourceGraphic"
        stdDeviation="5 5"
        result="blurred-graphic" />
    </filter>
  </defs>

  <!-- Rectangle with an initial blur effect -->
  <rect
    x="50"
    y="50"
    width="100"
    height="100"
    fill="hotpink"
    filter="url(#gaussian-blur-filter)" />
</svg>

<!-- Button to update the blur -->
<button id="updateBlur">Update Blur</button>

// Get the feGaussianBlur element
const gaussianBlur = document.querySelector("feGaussianBlur");

// Button to trigger the update
document.getElementById("updateBlur").addEventListener("click", () => {
  // Change the standard deviation (blur radius) of the blur effect
  gaussianBlur.setStdDeviation(15, 20); // Update to X: 15, Y: 20
});