是否可以使用css3为svg元素设置阴影，类似
box-shadow: -5px -5px 5px #888;
-webkit-box-shadow: -5px -5px 5px #888;
我看到了有关使用滤镜效果创建阴影的一些评论。 有没有单独使用css的示例。 下面是正确使用cusor样式但没有阴影效果的工作代码。 请帮助我以最少的代码获得阴影效果。
svg .shadow { cursor:crosshair; -moz-box-shadow: -5px -5px 5px #888; -webkit-box-shadow: -5px -5px 5px #888; box-shadow: -5px -5px 5px #888; }<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" baseProfile="full" viewBox="0 0 120 70"> <rect class="shadow" x="10" y="10" width="100" height="50" fill="#c66" /> </svg>#1楼
使用新的 CSS filter属性。
受webkit浏览器 ，Firefox 34+和Edge支持 。
您可以使用此填充工具 ，将支持FF <34，IE6 +。
您可以这样使用它：
/* Use -webkit- only if supporting: Chrome < 54, iOS < 9.3, Android < 4.4.4 */ .shadow { -webkit-filter: drop-shadow( 3px 3px 2px rgba(0, 0, 0, .7)); filter: drop-shadow( 3px 3px 2px rgba(0, 0, 0, .7)); /* Similar syntax to box-shadow */ }<img src="https://upload.wikimedia.org/wikipedia/commons/c/ce/Star_wars2.svg" alt="" class="shadow" width="200"> <!-- Or --> <svg class="shadow" ...> <rect x="10" y="10" width="200" height="100" fill="#bada55" /> </svg> 此方法与box-shadow效果的不同之处在于，它解决了不透明度问题，并且不对框应用阴影效果，而是对svg元素本身的角落应用了阴影效果。
请注意 ：仅当将类放在单独的<svg>元素上时，此方法才有效。 不能将联SVG元件上使用此如<rect> 。
<!-- This will NOT work! -->
<svg><rect class="shadow" ... /></svg>
阅读有关html5rocks上的CSS过滤器的更多信息。
#2楼
我发现最简单的方法是使用feDropShadow 。 我永远不会回过头来使用那些我不理解的难以置信的过滤器标签名称。
<filter id="shadow" x="0" y="0" width="200%" height="200%">
<feDropShadow dx="40" dy="40" stdDeviation="35" flood-color="#ff0000" flood-opacity="1" />
</filter>
#3楼
黑色文字和白色阴影
另一种方式，我用于白色阴影（在文本上）：为阴影创建克隆：
注意 ：SVG声明中需要xmlns:xlink="http://www.w3.org/1999/xlink" 。
真实文本位于<defs>部分，具有位置，样式，但没有fill定义。
真实测试被克隆了两次：第一次是阴影，第二次是文本本人。
<svg xmlns="http://www.w3.org/2000/svg" width="640" height="70" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <filter id="Blur"><feGaussianBlur stdDeviation="0.8" /></filter> <text style="font-family:sans,helvetica;font-weight:bold;font-size:12pt" id="Text"><tspan x="12" y="19"> Black text with white shadow </tspan></text> </defs> <rect style="fill:#8AB" width="640" height="70" /> <use style="fill:white;" filter="url(#Blur)" xlink:href="#Text" transform="translate(1.8,.9)"/> <use style="fill:black;" xlink:href="#Text"/> </svg>与图片相同
有相同的要求： 在<defs>部分没有填充定义 ！
<svg xmlns="http://www.w3.org/2000/svg" width="364" height="172" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <filter id="Blur"><feGaussianBlur stdDeviation="0.8" /></filter> <g transform="matrix(.7,0,0,.7,-117.450795,-335.320895)" id="Img"> <g transform="matrix(12.997776,0,0,-12.997776,389.30313,662.04015)"> <path d="m 0,0 -1.107,0 c -0.039,0 -0.067,0.044 -0.067,0.086 0,0.015 0.589,1.914 0.589,1.914 0.021,0.071 0.023,0.073 0.031,0.073 l 0.001,0 c 0.009,0 0.01,-0.002 0.031,-0.073 0,0 0.589,-1.899 0.589,-1.914 C 0.067,0.044 0.037,0 0,0 M 1.493,4.345 C 1.482,4.383 1.448,4.411 1.408,4.414 l -4.065,0 C -2.698,4.41 -2.731,4.383 -2.742,4.346 c 0,0 -2.247,-7.418 -2.247,-7.432 0,-0.037 0.029,-0.067 0.067,-0.067 l 2.687,0 c 0.021,0.008 0.037,0.028 0.042,0.051 l 0.313,1 c 0.01,0.025 0.033,0.042 0.061,0.043 l 2.479,0.002 c 0.027,-0.002 0.051,-0.021 0.061,-0.045 l 0.32,-1 c 0.005,-0.023 0.021,-0.044 0.042,-0.052 0,0 2.642,10e-4 2.644,10e-4 0.037,0 0.068,0.028 0.068,0.065 0,0.013 -2.302,7.433 -2.302,7.433" /> </g> <g transform="matrix(12.997776,0,0,-12.997776,508.27177,644.93113)"> <path d="m 0,0 -1.651,-0.001 c 0,0 -0.044,0.013 -0.044,0.063 l -10e-4,0.833 c 0,0.05 0.044,0.063 0.044,0.063 l 1.514,0 C 0.038,0.958 0.394,0.87 0.394,0.463 0.394,0.056 0,0 0,0 m 7.916,0.645 3.741,0 0,2.453 -4.81,0 C 6.397,3.098 5.764,2.866 5.401,2.597 5.038,2.328 4.513,1.715 4.513,0.87 c 0,-0.845 0.513,-1.502 0.513,-1.502 0.263,-0.326 0.925,-1.005 0.925,-1.005 0.015,-0.016 0.024,-0.037 0.024,-0.061 0,-0.051 -0.041,-0.092 -0.092,-0.092 l -3.705,0 c -0.451,0.002 -0.482,0.181 -0.482,0.207 0,0.046 0.056,0.075 0.056,0.075 0.169,0.081 0.514,0.35 0.514,0.35 0.732,0.57 0.82,1.352 0.82,1.771 0,0.42 -0.063,1.163 -0.814,1.814 C 1.521,3.078 0.57,3.096 0.57,3.096 l -5.287,0 c 0,0 0,-7.52 0,-7.522 0,-0.024 0.022,-0.043 0.046,-0.043 l 2.943,0 0,2.11 c 0,0.037 0.057,0 0.057,0 l 1.533,-1.54 c 0.545,-0.551 1.446,-0.57 1.446,-0.57 l 5.796,0.001 c 0.989,0 1.539,0.538 1.69,0.688 0.15,0.151 0.651,0.714 0.651,1.647 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1.514,0 C 0.038,0.958 0.394,0.87 0.394,0.463 0.394,0.056 0,0 0,0 m 2.178,-1.79 c -0.45,0.002 -0.482,0.181 -0.482,0.207 0,0.046 0.056,0.075 0.056,0.075 0.169,0.081 0.514,0.35 0.514,0.35 0.732,0.57 0.82,1.352 0.82,1.771 0,0.42 -0.063,1.163 -0.814,1.814 C 1.521,3.078 0.57,3.098 0.57,3.098 l -5.287,0 c 0,0 0,-7.522 0,-7.524 0,-0.024 0.022,-0.043 0.046,-0.043 0.005,0 2.943,0 2.943,0 l 0,2.109 c 0,0.038 0.057,0 0.057,0 l 1.533,-1.539 c 0.545,-0.551 1.446,-0.57 1.446,-0.57 l 4.525,0 0,2.679 -3.655,0 z" /> </g> <g transform="matrix(12.997776,0,0,-12.997776,466.86346,556.40203)"> <path d="m 0,0 -1.107,0 c -0.041,0 -0.067,0.044 -0.067,0.086 0,0.016 0.589,1.914 0.589,1.914 0.021,0.071 0.027,0.073 0.031,0.073 l 0.001,0 c 0.004,0 0.01,-0.002 0.031,-0.073 0,0 0.589,-1.898 0.589,-1.914 C 0.067,0.044 0.04,0 0,0 M 1.49,4.347 C 1.479,4.385 1.446,4.412 1.405,4.414 l -4.065,0 C -2.7,4.412 -2.734,4.385 -2.745,4.348 c 0,0 -2.245,-7.42 -2.245,-7.434 0,-0.037 0.03,-0.067 0.067,-0.067 l 2.687,0 c 0.022,0.007 0.038,0.028 0.043,0.051 l 0.313,1.001 c 0.01,0.024 0.033,0.041 0.061,0.042 l 2.478,0 C 0.687,-2.061 0.71,-2.078 0.721,-2.102 l 0.32,-1 c 0.005,-0.023 0.021,-0.044 0.042,-0.052 0,0 2.642,10e-4 2.644,10e-4 0.037,0 0.067,0.028 0.067,0.066 0,0.012 -2.304,7.434 -2.304,7.434" /> </g> </g> </defs> <rect style="fill:#8AB" width="364" height="172" /> <use style="fill:white;" filter="url(#Blur)" xlink:href="#Img" transform="translate(1.8,.9)"/> <use style="fill:black;" xlink:href="#Img"/> </svg>#4楼
可能是演变，看来内联CSS过滤器在某种程度上可以很好地在元素上运行。
声明一个下拉阴影CSS滤镜，在SVG元素，在这两个类或内联不工作，如前面规定。
但是，至少在Firefox中，具有以下向导：
在DOM加载之后 ，使用javascript 内联附加过滤器声明。
// Does not works, with regular dynamic css styling: shadow0.onchange = () => { rect1.style.filter = "filter:drop-shadow(0 0 " + shadow0.value + "rem black);" } // Okay! Inline styling, appending. shadow1.onchange = () => { rect1.style += " ;filter:drop-shadow(0 0 " + shadow1.value + "rem black);" rect2.style += " ;filter:drop-shadow(0 0 " + shadow1.value + "rem black);" }<h4> Does not works! <input id="shadow0" type="number" min="0" max="100" step="0.1"> | Okay! <input id="shadow1" type="number" min="0" max="100" step="0.1"> <svg viewBox="0 0 120 70"> <rect id="rect1" x="10" y="10" width="100" height="50" fill="#c66" /> <!-- Inline style declaration does NOT works at svg level, no shadow at loading: --> <rect id="rect2" x="40" y="30" width="10" height="10" fill="#aaa" style="filter:drop-shadow(0 0 20rem black)" /> </svg> 
#5楼
使用drop-shadow（）CSS函数和rgba颜色值，可以轻松地向svg-element中添加一个阴影效果。 通过使用rgba颜色值，您可以更改阴影的不透明度。
img.light-shadow{ filter: drop-shadow(0px 3px 3px rgba(0, 0, 0, 0.4)); } img.dark-shadow{ filter: drop-shadow(0px 3px 3px rgba(0, 0, 0, 1)); }<img class="light-shadow" src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.svg" /> <img class="dark-shadow" src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-logo.svg" />来源：oschina
链接：https://my.oschina.net/stackoom/blog/3192014