今天看到技術羣中有人問svg中use元素可以設置樣式屬性不？因爲他的symbol有200多種，但是隻是顏色不一樣。如果挨個定義，那svg文件就會很長。自己也思考過這個問題後來看到http://tympanus.net/codrops/2015/07/16/styling-svg-use-content-css/這篇文章，收益匪淺。這篇文章講的比較詳細。就不在解釋原理了。直接上自己測試例子的代碼，比較直觀。
1 單純的svg文件，將style直接寫在<svg>標籤元素下
<svg xmlns="http://www.w3.org/2000/svg" style="display: none;" xmlns:xlink="http://www.w3.org/1999/xlink" width="2000" height="2000">
<style type="text/css">
svg path {
fill: inherit;
}
.codrops-1 {
fill: #4BC0A5;
color: #A4DFD1;
}
.codrops-2 {
fill: #0099CC;
color: #7FCBE5;
}
.codrops-3 {
fill: #5F5EC0;
color: #AEAFDD;
}
</style>
<def>
<symbol id="codrops" viewBox="0 0 23 30">
<path class="back" fill="#aaa" d="M22.63,18.261c-0.398-3.044-2.608-6.61-4.072-9.359c-1.74-3.271-3.492-5.994-5.089-8.62l0,0 c-1.599,2.623-3.75,6.117-5.487,9.385c0.391,0.718,0.495,1.011,0.889,1.816c0.143,0.294,0.535,1.111,0.696,1.43 c0.062-0.114,0.582-1.052,0.643-1.162c0.278-0.506,0.54-0.981,0.791-1.451c0.823-1.547,1.649-2.971,2.469-4.33 c0.817,1.359,1.646,2.783,2.468,4.33c0.249,0.47,0.513,0.946,0.791,1.453c1.203,2.187,2.698,4.906,2.96,6.895 c0.292,2.237-0.259,4.312-1.556,5.839c-1.171,1.376-2.824,2.179-4.663,2.263c-1.841-0.084-3.493-0.887-4.665-2.263 c-0.16-0.192-0.311-0.391-0.448-0.599c-0.543,0.221-1.127,0.346-1.735,0.365c-0.56-0.019-1.095-0.127-1.599-0.313 c1.448,3.406,4.667,5.66,8.447,5.78C19.086,29.537,23.469,24.645,22.63,18.261z"/>
<path class="front" fill="#ddd" d="M6.177,11.659c0.212,0.367,0.424,0.747,0.635,1.136c0.164,0.303,0.333,0.606,0.512,0.927 c0.683,1.225,1.618,2.898,1.755,3.937c0.144,1.073-0.111,2.056-0.716,2.769c-0.543,0.641-1.315,1.014-2.186,1.067 c-0.87-0.054-1.643-0.43-2.186-1.067c-0.604-0.713-0.858-1.695-0.715-2.771c0.137-1.036,1.072-2.712,1.755-3.936 c0.18-0.32,0.349-0.623,0.513-0.927C5.752,12.404,5.964,12.026,6.177,11.659 M6.177,5.966L6.177,5.966 c-1.02,1.649-2.138,3.363-3.247,5.419c-0.932,1.728-2.344,3.967-2.598,5.88c-0.535,4.014,2.261,7.09,5.846,7.203 c3.583-0.113,6.379-3.189,5.845-7.203c-0.255-1.912-1.666-4.152-2.598-5.88C8.314,9.329,7.196,7.617,6.177,5.966L6.177,5.966z"/>
</symbol>
</def>
<use x="0" y="0" width="100" height="100" xlink:href="#codrops" class="codrops-1"/>
<use x="100" y="0" width="100" height="100" xlink:href="#codrops" class="codrops-2"/>
<use x="200" y="0" width="100" height="100" xlink:href="#codrops" class="codrops-3"/>
</svg>
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
svg path {
fill: inherit;
}
use.codrops-1 {
fill: #4BC0A5;
color: #A4DFD1;
}
use.codrops-2 {
fill: #0099CC;
color: #7FCBE5;
}
use.codrops-3 {
fill: #5F5EC0;
color: #AEAFDD;
}
</style>
</head>
<body>
<div style="width:1000px;height:1000px;border:2px solid #F00;overflow-y:scroll;">
<svg style="display: none;">
<symbol id="codrops" viewBox="0 0 23 30">
<path class="back" fill="#aaa" d="M22.63,18.261c-0.398-3.044-2.608-6.61-4.072-9.359c-1.74-3.271-3.492-5.994-5.089-8.62l0,0 c-1.599,2.623-3.75,6.117-5.487,9.385c0.391,0.718,0.495,1.011,0.889,1.816c0.143,0.294,0.535,1.111,0.696,1.43 c0.062-0.114,0.582-1.052,0.643-1.162c0.278-0.506,0.54-0.981,0.791-1.451c0.823-1.547,1.649-2.971,2.469-4.33 c0.817,1.359,1.646,2.783,2.468,4.33c0.249,0.47,0.513,0.946,0.791,1.453c1.203,2.187,2.698,4.906,2.96,6.895 c0.292,2.237-0.259,4.312-1.556,5.839c-1.171,1.376-2.824,2.179-4.663,2.263c-1.841-0.084-3.493-0.887-4.665-2.263 c-0.16-0.192-0.311-0.391-0.448-0.599c-0.543,0.221-1.127,0.346-1.735,0.365c-0.56-0.019-1.095-0.127-1.599-0.313 c1.448,3.406,4.667,5.66,8.447,5.78C19.086,29.537,23.469,24.645,22.63,18.261z"/>
<path class="front" fill="#ddd" d="M6.177,11.659c0.212,0.367,0.424,0.747,0.635,1.136c0.164,0.303,0.333,0.606,0.512,0.927 c0.683,1.225,1.618,2.898,1.755,3.937c0.144,1.073-0.111,2.056-0.716,2.769c-0.543,0.641-1.315,1.014-2.186,1.067 c-0.87-0.054-1.643-0.43-2.186-1.067c-0.604-0.713-0.858-1.695-0.715-2.771c0.137-1.036,1.072-2.712,1.755-3.936 c0.18-0.32,0.349-0.623,0.513-0.927C5.752,12.404,5.964,12.026,6.177,11.659 M6.177,5.966L6.177,5.966 c-1.02,1.649-2.138,3.363-3.247,5.419c-0.932,1.728-2.344,3.967-2.598,5.88c-0.535,4.014,2.261,7.09,5.846,7.203 c3.583-0.113,6.379-3.189,5.845-7.203c-0.255-1.912-1.666-4.152-2.598-5.88C8.314,9.329,7.196,7.617,6.177,5.966L6.177,5.966z"/>
</symbol>
</svg>
<svg height="90px" width="69px">
<use xlink:href="#codrops" class="codrops-1"/>
</svg>
<svg height="90px" width="69px">
<use xlink:href="#codrops" class="codrops-2"/>
</svg>
<svg height="90px" width="69px">
<use xlink:href="#codrops" class="codrops-3"/>
</svg>
</div>
</body>
</html>
效果如下圖
