baseFrequency

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年7月⁩.

baseFrequency 属性表示 <feTurbulence> 滤镜原语的噪点函数的基础频率参数。

你可以将此属性与以下 SVG 元素一起使用：

<feTurbulence>

示例

示例 1

html, body, svg { height: 100%; }

html

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg"> <filter id="noise1" x="0" y="0" width="100%" height="100%"> <feTurbulence baseFrequency="0.025" /> </filter> <filter id="noise2" x="0" y="0" width="100%" height="100%"> <feTurbulence baseFrequency="0.05" /> </filter> <rect x="0" y="0" width="200" height="200" style="filter: url(#noise1);" /> <rect x="0" y="0" width="200" height="200" style="filter: url(#noise2); transform: translateX(220px);" /> </svg>

示例 2

html

<svg width="200" height="200" viewBox="0 0 220 220" xmlns="http://www.w3.org/2000/svg"> <filter id="displacementFilter"> <feTurbulence type="turbulence" baseFrequency="0.05" numOctaves="2" result="turbulence" /> <feDisplacementMap in2="turbulence" in="SourceGraphic" scale="50" xChannelSelector="R" yChannelSelector="G" /> </filter> <circle cx="100" cy="100" r="100" style="filter: url(#displacementFilter)" /> </svg>