Question

如何使旋转器的最后部分变亮（即褪色）：

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<div id="loader-wrapper">
  <div id="loader"></div>
</div>

＆＃13;

gradient

＆＃13;

我尝试使用mongod.service - High-performance, schema-free document-oriented database Loaded: loaded (/lib/systemd/system/mongod.service; disabled) Active: failed (Result: exit-code) since Tue 2016-12-27 15:14:43 CST; 56s ago Process: 29940 ExecStart=/usr/bin/mongod $OPTIONS run (code=exited, status=14) Process: 29928 ExecStartPre=/usr/bin/percona-server-mongodb-helper.sh (code=exited, status=0/SUCCESS) Main PID: 29940 (code=exited, status=14) Dec 27 15:14:43 debian systemd[1]: Started High-performance, schema-free document-oriented database. Dec 27 15:14:43 debian mongod[29940]: 2016-12-27T15:14:43.177-0600 I STORAGE Compression: snappy Dec 27 15:14:43 debian mongod[29940]: 2016-12-27T15:14:43.177-0600 I STORAGE MaxWriteMBPerSec: 1024 Dec 27 15:14:43 debian mongod[29940]: 2016-12-27T15:14:43.177-0600 I STORAGE Crash safe counters: 0 Dec 27 15:14:43 debian systemd[1]: mongod.service: main process exited, code=exited, status=14/n/a Dec 27 15:14:43 debian systemd[1]: Unit mongod.service entered failed state.，但将转换为正方形

Answer 1

您可以将渐变应用于伪元素，如下所示：

＆＃13;

#loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
}
#loader {
  display: block;
  position: relative;
  left: 50%;
  top: 50%;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;
  border-radius: 50%;
  border: 5px solid transparent;
  border-top-color: #aaa;
  border-right-color: #aaa;
  animation: spin 2s linear infinite;
}
#loader::after {
  content: '';
  width: 85%;
  height: 85%;
  background: linear-gradient(45deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 1) 40%, rgba(255, 255, 255, 0.7) 60%, rgba(255, 255, 255, 0) 100%);
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-5%, -5%);
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

＆＃13;

<div id="loader-wrapper">
  <div id="loader"></div>
</div>

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Answer 2

这是另一个代码更少且不使用伪元素的想法。

.loader {
  --border-width: 5px;
  
  height: 150px;
  width: 150px;
  border-radius: 50%;
  
  /* 0.5px's are needed to avoid hard-stopping */
  --mask: radial-gradient(
    farthest-side, 
    transparent calc(100% - var(--border-width) - 0.5px), 
    #000 calc(100% - var(--border-width) + 0.5px)
  );
  
  -webkit-mask: var(--mask);
          mask: var(--mask); 
  background: linear-gradient(#aaa 30%, transparent 80%) 0 0/50% 100% no-repeat; /* this is our border image */
  animation: spin 2s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

<div class="loader"></div>

这是通过将背景设置为正文将我的答案与@Ricky 的答案进行的比较：

@Ricky 的方式：

body {
  background: pink; /* just added this */
}

#loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
}
#loader {
  display: block;
  position: relative;
  left: 50%;
  top: 50%;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;
  border-radius: 50%;
  border: 5px solid transparent;
  border-top-color: #aaa;
  border-right-color: #aaa;
  animation: spin 2s linear infinite;
}
#loader::after {
  content: '';
  width: 85%;
  height: 85%;
  background: linear-gradient(45deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 1) 40%, rgba(255, 255, 255, 0.7) 60%, rgba(255, 255, 255, 0) 100%);
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-5%, -5%);
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

<div id="loader-wrapper">
  <div id="loader"></div>
</div>

我的方式：

body {
  background: pink; /* just added this */
}

.loader {
  --border-width: 5px;
  
  height: 150px;
  width: 150px;
  border-radius: 50%;
  
  /* 0.5px's are needed to avoid hard-stopping */
  --mask: radial-gradient(
    farthest-side, 
    transparent calc(100% - var(--border-width) - 0.5px), 
    #000 calc(100% - var(--border-width) + 0.5px)
  );
  
  -webkit-mask: var(--mask);
          mask: var(--mask); 
  background: linear-gradient(#aaa 30%, transparent 80%) 0 0/50% 100% no-repeat; /* this is our border image */
  animation: spin 2s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

<div class="loader"></div>

边框淡出圆圈

2 个答案: