请问要做出这种动态渐变色效果，可以用什么方法？

一毛不拔 要好服务?

帖子回复发错了

变色的地方一个从 255 到 0，一个从 0 到 255 ？

代码还是设计？如果是设计的画正常的设计师随便都能搞出来吧，如果是代码的话，可以让设计师给你一张完整的半圆渐变色图，然后再给你一张白色一样尺寸的图作为遮罩，写代码的时候，白色的盖在渐变色上面，当成一个进度条来做，按照进度旋转白色的遮罩图，这样实现简单

svg.

参考画图工具。初始红 255,蓝绿 0.然后增加一个减少一个，反复直到回到红 255 蓝绿 0

HSB 了解一下

@KayWong 感谢，这个思路不错

@Cooky @SakuraKuma @pkookp8 @xml123 抱歉没说清楚，是指前端代码实现

@ipuhua #9 svg 呀，html 不是支持么。lineargradient+path 就可以

@SakuraKuma 棒~好像确实可以！谢谢

background: linear-gradient 了解一下
动态加上循环关键帧动画了解一下

我找到一个类似的实现思路，给大家参考
www.zhangxinxu.com/wordpress/2015/07/svg-circle-loading/

@whypool 好的，谢谢

<div class="container">
<div class="out-circle">
<div class="point">
</div>
<div class="in-circle"></div>
</div>
<div class="mask"></div>
</div>

.out-circle {
position:relative;
width: 200px;
height:200px;
border-radius: 50%;

overflow: hidden;
box-shadow: 0 0 20px 0 rgba(0,0,255,0.1);
background-image: linear-gradient(to right, #43e97b 0%, #38f9d7 100%);
}

.point {
width: 400px;
height: 400px;
position:absolute;
left: 50%;
bottom: 40%;
transform: rotate(50deg);
transform-origin: 0 100%;
background-color:#fafafa;
}

.in-circle {
position:absolute;
width: 70%;
height: 70%;
top: 15%;
left: 15%;
background-color:#fff;
border-radius: 50%;
}

#container {
position: relative;
overflow: hidden;
}

.mask {
position: absolute;
width: 100%;
height: 100%;
background-color: #fff;
top: 60%;
}

@rabbbit 哈哈，一言不合上代码（大赞

svg 的话 用 linearGradient 和 clipPath 实现

```html
<svg width="245" height="120" style="position: absolute;">
<defs>
<linearGradient id="MyGradient" x1="0%" y1="0%" x2="0%" y2="100%">
<stop offset="0%" stop-color="#835FFF"></stop>
<stop offset="50%" stop-color="#4C74FF"></stop>
<stop offset="100%" stop-color="#2783FF"></stop>
</linearGradient>
<clipPath id="MyClipPath">
<path d="M3.552713678800501e-15,-98.5900603509299A9,9,0,0,1,9.818181818181822,-107.55279311010534A108,108,0,0,1,86.77852619712375,64.29220319024A9,9,0,0,1,73.55407079147611,65.64905688585722L73.55407079147611,65.64905688585722A9,9,0,0,1,72.31543849760311,53.576835991866666A90,90,0,0,0,8.18181818181818,-89.62732759175445A9,9,0,0,1,3.552713678800501e-15,-98.5900603509299Z"></path>
</clipPath>
</defs>
<g transform="translate(122.5, 105.6) rotate(-90)">
<path d="M3.552713678800501e-15,-98.5900603509299A9,9,0,0,1,9.818181818181822,-107.55279311010534A108,108,0,0,1,9.818181818181815,107.55279311010536A9,9,0,0,1,3.552713678800501e-15,98.5900603509299L3.552713678800501e-15,98.5900603509299A9,9,0,0,1,8.181818181818185,89.62732759175447A90,90,0,0,0,8.18181818181818,-89.62732759175445A9,9,0,0,1,3.552713678800501e-15,-98.5900603509299Z" stroke="none" fill="#EBF4F7"></path>
<path d="M3.552713678800501e-15,-98.5900603509299A9,9,0,0,1,9.818181818181822,-107.55279311010534A108,108,0,0,1,9.818181818181815,107.55279311010536A9,9,0,0,1,3.552713678800501e-15,98.5900603509299L3.552713678800501e-15,98.5900603509299A9,9,0,0,1,8.181818181818185,89.62732759175447A90,90,0,0,0,8.18181818181818,-89.62732759175445A9,9,0,0,1,3.552713678800501e-15,-98.5900603509299Z" stroke="none" fill="url(#MyGradient)" clip-path="url(#MyClipPath)"></path>
</g>
</svg>
```

wasm 做这个很合适