简单的 JS

使用以下简短的函数ImgToSvg将img转换为svg(包括类列表)

<img src="logo.svg" onload="ImgToSvg(this)" class="logo-img"/>

const ImgToSvg= async (img) => { const s = document.createElement('div'); s.innerHTML = await (await fetch(img.src)).text(); s.firstChild.classList = img.classList; img.replaceWith(s.firstChild) } .logo-img { fill: yellow; } <img onload="ImgToSvg(this)" class="logo-img" src="data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMzAwIiBoZWlnaHQ9IjMwMCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cmVjdCB4PSIyIiB5PSIyIiB3aWR0aD0iMjk2IiBoZWlnaHQ9IjI5NiIgc3R5bGU9InN0cm9rZTojNTU1NTU1O3N0cm9rZS13aWR0aDoyIi8+PHRleHQgeD0iNTAlIiB5PSI1MCUiIGZvbnQtc2l6ZT0iMTgiIHRleHQtYW5jaG9yPSJtaWRkbGUiIGFsaWdubWVudC1iYXNlbGluZT0ibWlkZGxlIiBmb250LWZhbWlseT0ibW9ub3NwYWNlLCBzYW5zLXNlcmlmIiBmaWxsPSIjNTU1NTU1Ij4zMDAmIzIxNTszMDA8L3RleHQ+PC9zdmc+" /> <!-- in this snippet I use dataURI in img src to avoid CORS problems witch reading svg data from external source by js -->

这是对Waruyama answer的改进，提供了简短的js函数

这对于想要使用CSS操作的PHP和.svg图像组合使用的人可能很有帮助。

你不能用CSS覆盖img标签内的属性。但是当svg源代码嵌入到HTML中时，你当然可以。我喜欢用require_once函数来解决这个问题，其中包含一个.svg.php文件。这就像导入一个图像，但你仍然可以用CSS覆盖样式!

首先包含svg文件:

<?php require_once( '/assets/images/my-icon.svg.php' ); ?>

它包括这个图标，例如:

<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>

现在我们可以像这样用CSS简单地改变填充颜色:

svg path {
  fill: blue;
}

我首先尝试用file_get_contents()解决这个问题，但上面的解决方案要快得多。

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/

这个答案是基于https://stackoverflow.com/a/24933495/3890888，但是使用了一个简单的JavaScript版本的脚本。

您需要将SVG设置为内联SVG。你可以使用这个脚本，通过添加类svg到图像:

/*
 * Replace all SVG images with inline SVG
 */
document.querySelectorAll('img.svg').forEach(function(img){
    var imgID = img.id;
    var imgClass = img.className;
    var imgURL = img.src;

    fetch(imgURL).then(function(response) {
        return response.text();
    }).then(function(text){

        var parser = new DOMParser();
        var xmlDoc = parser.parseFromString(text, "text/xml");

        // Get the SVG tag, ignore the rest
        var svg = xmlDoc.getElementsByTagName('svg')[0];

        // Add replaced image's ID to the new SVG
        if(typeof imgID !== 'undefined') {
            svg.setAttribute('id', imgID);
        }
        // Add replaced image's classes to the new SVG
        if(typeof imgClass !== 'undefined') {
            svg.setAttribute('class', imgClass+' replaced-svg');
        }

        // Remove any invalid XML tags as per http://validator.w3.org
        svg.removeAttribute('xmlns:a');

        // Check if the viewport is set, if the viewport is not set the SVG wont't scale.
        if(!svg.getAttribute('viewBox') && svg.getAttribute('height') && svg.getAttribute('width')) {
            svg.setAttribute('viewBox', '0 0 ' + svg.getAttribute('height') + ' ' + svg.getAttribute('width'))
        }

        // Replace image with new SVG
        img.parentNode.replaceChild(svg, img);

    });

});

然后，现在如果你这样做了:

.logo-img path {
  fill: #000;
}

或者可能是:

.logo-img path {
  background-color: #000;
}

JSFiddle: http://jsfiddle.net/erxu0dzz/1/

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。