我需要通过添加一个类来更改SVG fill属性。从#fff到#000说。我试着用两种不同的方法摆弄。我用其中一种方法取得了成功。相反，我不喜欢使用我成功的方法。
方法1： - 成功。
我刚在body标签上添加了一个类并覆盖了svg fill属性。看看下面的代码
var button = document.getElementById("btn");
var body = document.body
var count = false;
button.onclick = changeBackground;
function changeBackground() {
body.classList.toggle('toggle');
}body {
background: #3d3d3d;
}
.sheetListWhite {
fill: #fff;
}
.slBGColor {
fill: #3d3d3d;
}
.toggle {
background: #fff;
}
.toggle .sheetListWhite {
fill: #3d3d3d;
}
.toggle .slBGColor {
fill: #fff;
}<svg width="18px" height="18px" viewBox="-2 -2 13 13">
<use xlink:href="#sharedByMe" class="sheetListWhite"></use>
</svg>
<button id="btn"> Change background</button>
<svg style="display:none;">
<symbol id="sharedByMe">
<g id="user-(5)">
<path d="M5.76735992,5.07170748 C6.58617985,4.59194553 7.12018634,3.73525063 7.12018634,2.74147173 C7.12020298,1.23365988 5.8385508,0 4.27211846,0 C2.70568612,0 1.42403394,1.23365988 1.42403394,2.74147173 C1.42403394,3.73525063 1.95804042,4.59196155 2.77686035,5.07170748 C1.35282642,5.58574044 0.284796801,6.78512932 0,8.22439918 L0.712025292,8.22439918 C1.06802962,6.64806134 2.52768396,5.48292744 4.27211846,5.48292744 C6.01655296,5.48292744 7.47620731,6.64804532 7.83221163,8.22439918 L8.54423692,8.22439918 C8.25944012,6.75085832 7.19141051,5.55146944 5.76735992,5.07170748 Z M2.13605923,2.74147173 C2.13605923,1.61062486 3.09729421,0.685371939 4.27211846,0.685371939 C5.44694272,0.685371939 6.40817769,1.61062486 6.40817769,2.74147173 C6.40817769,3.87231861 5.44694272,4.79757153 4.27211846,4.79757153 C3.09729421,4.79757153 2.13605923,3.87231861 2.13605923,2.74147173 Z" id="Shape"></path>
</g>
<g id="shared-folder" transform="translate(6.111111, 5.294118)">
<ellipse id="Oval-6" class="slBGColor" cx="2.44444444" cy="2.35294118" rx="2.44444444" ry="2.35294118"></ellipse>
<path d="M3.54444101,1.45883032 C3.94870693,1.45883032 4.27777778,1.13170727 4.27777778,0.729415161 C4.27777778,0.327123049 3.94870693,0 3.54444101,0 C3.14017508,0 2.81110424,0.327140144 2.81110424,0.729415161 C2.81110424,0.781778783 2.81720578,0.832655093 2.82779325,0.881924423 L1.89436023,1.34613656 C1.7598169,1.19301186 1.56441282,1.09413129 1.34443069,1.09413129 C0.940181958,1.09411419 0.611111111,1.42125434 0.611111111,1.82352936 C0.611111111,2.22580437 0.940181958,2.55294452 1.34444788,2.55294452 C1.56439563,2.55294452 1.75974815,2.45413233 1.89429148,2.30105891 L2.82781043,2.76516848 C2.81720578,2.81442071 2.81110424,2.86527993 2.81110424,2.91764355 C2.81110424,3.31991857 3.14017508,3.64705871 3.54444101,3.64705871 C3.94870693,3.64705871 4.27777778,3.31993566 4.27777778,2.91764355 C4.27777778,2.51536853 3.94870693,2.18822839 3.54444101,2.18822839 C3.32445888,2.18822839 3.12903762,2.28710896 2.99449429,2.44025076 L2.06104408,1.97615829 C2.07164873,1.92685476 2.07778465,1.87594426 2.07778465,1.82352936 C2.07778465,1.77116573 2.07168311,1.72028942 2.06109564,1.67102009 L2.99452866,1.20680796 C3.12905481,1.35994975 3.32444169,1.45883032 3.54444101,1.45883032 Z" id="Shape"></path>
</g>
</symbol>
</svg>
查看小提琴HERE
方法2 - 失败
不是将类直接添加到body标签，而是将其添加到div上。
var button = document.getElementById("btn");
var body = document.getElementById("check");
var count = false;
button.onclick = changeBackground;
function changeBackground() {
body.classList.toggle('toggle');
}div {
height: 300px;
width: 100%;
background: #3d3d3d
}
.sheetListWhite {
fill: #fff;
}
.slBGColor {
fill: #3d3d3d;
}
.toggle {
background: #fff;
}
.toggle .sheetListWhite {
background: #3d3d3d
}
.toggle .slBGColor {
fill: #fff;
}<div id="check">
<svg width="18px" height="18px" viewBox="-2 -2 13 13">
<use xlink:href="#sharedByMe" class="sheetListWhite"></use>
</svg>
<button id="btn"> Change background</button>
</div>
<svg style="display:none;">
<symbol id="sharedByMe">
<g id="user-(5)">
<path d="M5.76735992,5.07170748 C6.58617985,4.59194553 7.12018634,3.73525063 7.12018634,2.74147173 C7.12020298,1.23365988 5.8385508,0 4.27211846,0 C2.70568612,0 1.42403394,1.23365988 1.42403394,2.74147173 C1.42403394,3.73525063 1.95804042,4.59196155 2.77686035,5.07170748 C1.35282642,5.58574044 0.284796801,6.78512932 0,8.22439918 L0.712025292,8.22439918 C1.06802962,6.64806134 2.52768396,5.48292744 4.27211846,5.48292744 C6.01655296,5.48292744 7.47620731,6.64804532 7.83221163,8.22439918 L8.54423692,8.22439918 C8.25944012,6.75085832 7.19141051,5.55146944 5.76735992,5.07170748 Z M2.13605923,2.74147173 C2.13605923,1.61062486 3.09729421,0.685371939 4.27211846,0.685371939 C5.44694272,0.685371939 6.40817769,1.61062486 6.40817769,2.74147173 C6.40817769,3.87231861 5.44694272,4.79757153 4.27211846,4.79757153 C3.09729421,4.79757153 2.13605923,3.87231861 2.13605923,2.74147173 Z" id="Shape"></path>
</g>
<g id="shared-folder" transform="translate(6.111111, 5.294118)">
<ellipse id="Oval-6" class="slBGColor" cx="2.44444444" cy="2.35294118" rx="2.44444444" ry="2.35294118"></ellipse>
<path d="M3.54444101,1.45883032 C3.94870693,1.45883032 4.27777778,1.13170727 4.27777778,0.729415161 C4.27777778,0.327123049 3.94870693,0 3.54444101,0 C3.14017508,0 2.81110424,0.327140144 2.81110424,0.729415161 C2.81110424,0.781778783 2.81720578,0.832655093 2.82779325,0.881924423 L1.89436023,1.34613656 C1.7598169,1.19301186 1.56441282,1.09413129 1.34443069,1.09413129 C0.940181958,1.09411419 0.611111111,1.42125434 0.611111111,1.82352936 C0.611111111,2.22580437 0.940181958,2.55294452 1.34444788,2.55294452 C1.56439563,2.55294452 1.75974815,2.45413233 1.89429148,2.30105891 L2.82781043,2.76516848 C2.81720578,2.81442071 2.81110424,2.86527993 2.81110424,2.91764355 C2.81110424,3.31991857 3.14017508,3.64705871 3.54444101,3.64705871 C3.94870693,3.64705871 4.27777778,3.31993566 4.27777778,2.91764355 C4.27777778,2.51536853 3.94870693,2.18822839 3.54444101,2.18822839 C3.32445888,2.18822839 3.12903762,2.28710896 2.99449429,2.44025076 L2.06104408,1.97615829 C2.07164873,1.92685476 2.07778465,1.87594426 2.07778465,1.82352936 C2.07778465,1.77116573 2.07168311,1.72028942 2.06109564,1.67102009 L2.99452866,1.20680796 C3.12905481,1.35994975 3.32444169,1.45883032 3.54444101,1.45883032 Z" id="Shape"></path>
</g>
</symbol>
</svg>
小提琴HERE
现在您可以看到我无法覆盖以下类 .slBGColor，.sheetListWhite
如何摆脱这个错误？任何的想法。我不想直接使用svg标记而不是use tag。我的意思是我想从外部资源中使用我的所有SVG。任何帮助
感谢。
答案 0 :(得分：0)
无法通过<use>元素解决<use>的“内部”问题。它被认为是不透明/私密的。就浏览器而言，class="slBGColor"内没有<div>。所以.toggle .slBGColor {}什么也没做。
你可以通过重新设置符号定义本身来使其工作。
例如，如果我对您的示例进行以下两项更改，则符号中的椭圆会根据是否设置“切换”类来更改颜色。
var body = document.body;
.toggle div {
background: red;
}
https://jsfiddle.net/nuorcj0a/4/
但是，请注意，这也将更改页面上该符号的任何其他引用。