将SVG输出直接内联到页面代码中，我可以简单地用CSS修改填充颜色，如下所示:
polygon.mystar {
fill: blue;
}
circle.mycircle {
fill: green;
}
这工作得很好，但是我正在寻找一种方法来修改SVG的“填充”属性，当它作为背景-图像时。
html {
background-image: url(../img/bg.svg);
}
我现在怎么改变颜色?这可能吗?
作为参考，以下是我的外部SVG文件的内容:
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="320px" height="100px" viewBox="0 0 320 100" enable-background="new 0 0 320 100" xml:space="preserve">
<polygon class="mystar" fill="#3CB54A" points="134.973,14.204 143.295,31.066 161.903,33.77 148.438,46.896 151.617,65.43 134.973,56.679
118.329,65.43 121.507,46.896 108.042,33.77 126.65,31.066 "/>
<circle class="mycircle" fill="#ED1F24" cx="202.028" cy="58.342" r="12.26"/>
</svg>
下面是另一种解决方案，使用渐变和单色图标作为背景和背景混合模式来着色图标。
它要求背景色是白色的，否则整个背景都会上色。我只在Chrome上进行了测试。
.colored-background {
background-image: linear-gradient(45deg, green, green), url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23000000%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
background-color: #fff;
background-blend-mode: lighten, normal;
background-repeat: no-repeat;
background-position: center, center right .8em;
background-size: auto, 0.6em;
color: red;
display: inline-flex;
align-items: center;
padding: 0.5em;
padding-right: 2em;
height: 1.6em;
width: auto;
border: 1px solid gray;
}
.bg {
background-color: #ddd;
padding: 1em;
}
<div class="bg">
<div class="colored-background">green icon from black svg</div>
</div>
现在你可以像这样在客户端实现这一点:
var green = '3CB54A';
var red = 'ED1F24';
var svg = '<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="320px" height="100px" viewBox="0 0 320 100" enable-background="new 0 0 320 100" xml:space="preserve"> <polygon class="mystar" fill="#'+green+'" points="134.973,14.204 143.295,31.066 161.903,33.77 148.438,46.896 151.617,65.43 134.973,56.679 118.329,65.43 121.507,46.896 108.042,33.77 126.65,31.066 "/><circle class="mycircle" fill="#'+red+'" cx="202.028" cy="58.342" r="12.26"/></svg>';
var encoded = window.btoa(svg);
document.body.style.background = "url(data:image/svg+xml;base64,"+encoded+")";
小提琴!
下面是另一种解决方案，使用渐变和单色图标作为背景和背景混合模式来着色图标。
它要求背景色是白色的，否则整个背景都会上色。我只在Chrome上进行了测试。
.colored-background {
background-image: linear-gradient(45deg, green, green), url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23000000%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
background-color: #fff;
background-blend-mode: lighten, normal;
background-repeat: no-repeat;
background-position: center, center right .8em;
background-size: auto, 0.6em;
color: red;
display: inline-flex;
align-items: center;
padding: 0.5em;
padding-right: 2em;
height: 1.6em;
width: auto;
border: 1px solid gray;
}
.bg {
background-color: #ddd;
padding: 1em;
}
<div class="bg">
<div class="colored-background">green icon from black svg</div>
</div>
我需要一些类似的东西，并想坚持使用CSS。这里有LESS和SCSS mixins以及普通的CSS，可以帮助你做到这一点。不幸的是，它的浏览器支持有点松懈。有关浏览器支持的详细信息，请参见下面。
更少的混合:
.element-color(@color) {
background-image: url('data:image/svg+xml;utf8,<svg ...><g stroke="@{color}" ... /></g></svg>');
}
更少的使用方法:
.element-color(#fff);
SCSS混合:
@mixin element-color($color) {
background-image: url('data:image/svg+xml;utf8,<svg ...><g stroke="#{$color}" ... /></g></svg>');
}
SCSS用法:
@include element-color(#fff);
CSS:
// color: red
background-image: url('data:image/svg+xml;utf8,<svg ...><g stroke="red" ... /></g></svg>');
这里有更多关于将完整的SVG代码嵌入到CSS文件中的信息。它还提到浏览器兼容性有点太小，这是一个可行的选择。
