来自@Praveen的答案是可靠的。

我不能让它在我的工作中响应，所以我为它做了一个jquery悬停函数。

CSS

.svg path {
   transition:0.3s all !important;
}

JS / JQuery

// code from above wrapped into a function
replaceSVG();

// hover function
// hover over an element, and find the SVG that you want to change
$('.element').hover(function() {
    var el = $(this);
    var svg = el.find('svg path');
    svg.attr('fill', '#CCC');
}, function() {
    var el = $(this);
    var svg = el.find('svg path');
    svg.attr('fill', '#3A3A3A');
});

如果你只是在真实颜色和黑白之间切换图像，你可以设置一个选择器为:

{过滤器:没有;}

另一个是:

{filter:grayscale(100%);}

为了扩展@gringo的答案，在其他答案中描述的Javascript方法是有效的，但需要用户下载不必要的图像文件，而且在我看来，它会膨胀你的代码。

I think a better approach would be to to migrate all 1-color vector graphics to a webfont file. I've used Fort Awesome in the past, and it works great to combine your custom icons/images in SVG format, along with any 3rd party icons you may be using (Font Awesome, Bootstrap icons, etc.) into a single webfont file the user has to download. You can also customize it, so you only include the 3rd party icons you're using. This reduces the number of requests the page has to make, and you're overall page weight, especially if you're already including any 3rd party icons libraries.

如果你更喜欢一个更面向开发的选项，你可以谷歌"npm svg webfont"，并使用一个最适合你的环境的节点模块。

一旦你完成了这两个选项中的任何一个，那么你就可以很容易地通过CSS改变颜色，而且很可能，你已经在这个过程中加快了你的网站。

对于我来说，我的svg在使用img和svg时看起来有所不同。所以我的解决方案将img转换为csv，在内部更改样式并返回img(尽管它需要更多的工作)，我相信“blob”也有更好的兼容性比upvotes使用“掩码”的答案。

  let img = yourimgs[0];
  if (img.src.includes(".svg")) {
    var ajax = new XMLHttpRequest();
    ajax.open("GET", img.src, true);
    ajax.send();
    ajax.onload = function (e) {
     
      svg = e.target.responseText;

     
      svgText = "";
      //change your svg-string as youd like, for example
      // replacing the hex color between "{fill:" and ";"
      idx = svg.indexOf("{fill:");
      substr = svg.substr(idx + 6);
      str1 = svg.substr(0, idx + 6);
      str2 = substr.substr(substr.indexOf(";"));
      svgText = str1 + "#ff0000" + str2;
      

      let blob = new Blob([svgText], { type: "image/svg+xml" });
      let url = URL.createObjectURL(blob);
      let image = document.createElement("img");
      image.src = url;
      image.addEventListener("load", () => URL.revokeObjectURL(url), {
        once: true,
      });
      img.replaceWith(image);
    };
  }

编辑您的SVG文件，将fill="currentColor"添加到SVG标记中，并确保从文件中删除任何其他填充属性。

例如:

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 139.435269383854" id="img" fill="currentColor">...
</svg>

注意，currentColor是一个关键字(不是使用的固定颜色)。

在此之后，您可以使用CSS更改颜色，通过设置元素的颜色属性或从它的父元素。

例子:

.div-with-svg-inside {
    color: red;
}

我忘了说，你必须这样插入SVG:

<svg>
   <use xlink:href='/assets/file.svg#img' href="/assets/file.svg#img"></use>
</svg>

如果image来自某个变量，那么

<svg>
  <use [attr.xlink:href]="somevariable + '#img'" [attr.href]="somevariable + '#img'"></use>
</svg>

Note that `#img` is the id of the `svg` tag inside svg file. Also note `xlink:href` has been deprecated instead you should use `href` or use can use both to support older browser versions.

Another way of doing it: [https://css-tricks.com/cascading-svg-fill-color/][1]


  [1]: https://css-tricks.com/cascading-svg-fill-color/

直接到svg填充css将不工作，你可以使用如下

<style>
svg path {
    fill: red;
}
</style>
<svg xmlns="http://www.w3.org/2000/svg" width="20.666" height="59.084" viewBox="0 0 20.666 59.084"><g transform="translate(-639.749 -3139)"><path d="M648.536,3173.876c0-2.875-1.725-3.8-3.471-3.8-1.683,0-3.49.9-3.49,3.8,0,3,1.786,3.8,3.49,3.8C646.811,3177.676,648.536,3176.769,648.536,3173.876Zm-3.471,2.341c-.883,0-1.437-.513-1.437-2.341,0-1.971.615-2.381,1.437-2.381.862,0,1.438.349,1.438,2.381,0,1.907-.616,2.339-1.438,2.339Z" fill="#142312"/><path d="M653.471,3170.076a1.565,1.565,0,0,0-1.416.9l-6.558,13.888h1.2a1.565,1.565,0,0,0,1.416-.9l6.559-13.887Z" fill="#142312"/><path d="M655.107,3177.263c-1.684,0-3.471.9-3.471,3.8,0,3,1.766,3.8,3.471,3.8,1.745,0,3.49-.9,3.49-3.8C658.6,3178.186,656.851,3177.263,655.107,3177.263Zm0,6.139c-.884,0-1.438-.514-1.438-2.34,0-1.972.617-2.381,1.438-2.381.862,0,1.437.349,1.437,2.381,0,1.909-.616,2.34-1.437,2.34Z" fill="#142312"/><path d="M656.263,3159.023l-1.49-14.063a1.35,1.35,0,0,0,.329-.293,1.319,1.319,0,0,0,.268-1.123l-.753-3.49a1.328,1.328,0,0,0-1.306-1.054h-6.448a1.336,1.336,0,0,0-1.311,1.068l-.71,3.493a1.344,1.344,0,0,0,.276,1.112,1.532,1.532,0,0,0,.283.262l-1.489,14.087c-1.7,1.727-4.153,4.871-4.153,8.638v28.924a1.339,1.339,0,0,0,1.168,1.49,1.357,1.357,0,0,0,.17.01h17.981a1.366,1.366,0,0,0,1.337-1.366v-29.059C660.414,3163.893,657.963,3160.749,656.263,3159.023Zm-8.307-17.349h4.274l.176.815H647.79Zm9.785,43.634v10.1H642.434v-17.253a4.728,4.728,0,0,1-2.028-4.284,4.661,4.661,0,0,1,2.028-4.215v-2c0-3.162,2.581-5.986,3.687-7.059a1.356,1.356,0,0,0,.4-.819l1.542-14.614H652.1l1.545,14.618a1.362,1.362,0,0,0,.4.819c1.109,1.072,3.688,3.9,3.688,7.059v9.153a5.457,5.457,0,0,1,0,8.5Z" fill="#142312"/></g></svg>

这对我很有效