css - css动画图标调整大小

Question

你如何在 CSS 中使用 $

[http://codepen.io/jlong/pen/KBhDf][1]

在第 3 行的上述链接中 $heartbeat-size: 10px; 我想知道如何在样式表中使用这个元素。

Answer 1

为了回答您的问题，以下是您笔中的处理CSS结果：scss

@-webkit-keyframes heartbeat {
  0% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  14% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  28% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  42% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  70% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
}
@-moz-keyframes heartbeat {
  0% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  14% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  28% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  42% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  70% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
}
@-o-keyframes heartbeat {
  0% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  14% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  28% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  42% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  70% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
}
@keyframes heartbeat {
  0% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  14% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  28% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
  42% {
    -moz-transform: rotate(45deg) scale(1.3);
    -ms-transform: rotate(45deg) scale(1.3);
    -webkit-transform: rotate(45deg) scale(1.3);
    transform: rotate(45deg) scale(1.3);
  }
  70% {
    -moz-transform: rotate(45deg) scale(1);
    -ms-transform: rotate(45deg) scale(1);
    -webkit-transform: rotate(45deg) scale(1);
    transform: rotate(45deg) scale(1);
  }
}
body {
  text-align: center;
  padding: 50px;
}

/* Styles for old versions of IE */
.heartbeat {
  font-family: sans-serif;
  font-weight: 100;
}

/* :not(:required) hides this rule from IE9 and below */
.heartbeat:not(:required) {
  -webkit-animation: heartbeat 1300ms ease 0s infinite normal;
  -khtml-animation: heartbeat 1300ms ease 0s infinite normal;
  -moz-animation: heartbeat 1300ms ease 0s infinite normal;
  -ms-animation: heartbeat 1300ms ease 0s infinite normal;
  -o-animation: heartbeat 1300ms ease 0s infinite normal;
  animation: heartbeat 1300ms ease 0s infinite normal;
  display: inline-block;
  position: relative;
  overflow: hidden;
  text-indent: -9999px;
  width: 36px;
  height: 36px;
  -moz-transform: rotate(45deg) scale(1);
  -ms-transform: rotate(45deg) scale(1);
  -webkit-transform: rotate(45deg) scale(1);
  transform: rotate(45deg) scale(1);
  -moz-transform-origin: 50% 50%;
  -ms-transform-origin: 50% 50%;
  -webkit-transform-origin: 50% 50%;
  transform-origin: 50% 50%;
}
.heartbeat:not(:required):after, .heartbeat:not(:required):before {
  position: absolute;
  content: "";
  background: #e87;
}
.heartbeat:not(:required):before {
  -moz-border-radius-topleft: 12px;
  -webkit-border-top-left-radius: 12px;
  border-top-left-radius: 12px;
  -moz-border-radius-bottomleft: 12px;
  -webkit-border-bottom-left-radius: 12px;
  border-bottom-left-radius: 12px;
  top: 12px;
  left: 0;
  width: 36px;
  height: 24px;
}
.heartbeat:not(:required):after {
  -moz-border-radius-topleft: 12px;
  -webkit-border-top-left-radius: 12px;
  border-top-left-radius: 12px;
  -moz-border-radius-topright: 12px;
  -webkit-border-top-right-radius: 12px;
  border-top-right-radius: 12px;
  top: 0;
  left: 12px;
  width: 24px;
  height: 12px;
}

<span class="heartbeat">Loading...</span>

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了解原理...

目前无法在其中使用变量，CSS也不太可能很快实现。

这仅在使用 CSS 预处理器时可用，例如less或sass。

jsfiddle并codepen允许您在面板中使用scss（sass）并在渲染时正确输出处理后的内容。CSSCSS

sass.js是一个库，允许您在标签中使用.sass文件并在加载时将它们处理为有效。<link>CSS

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It is likely that major browsers will soon be capable of processing .scss, .sass or .less files natively and it is already possible by using browser extensions.

This, however, does not mean CSS will ever support variables.