SVG描边动画

效果如下：
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>nubia</title>
 <style>
 .nubia_logo{
 position: absolute;
 opacity: 0;
 animation:fadeIn 2s ease-in forwards;
  -webkit-animation:fadeIn 2s ease-in forwards;
 top: 50%;
 -ms-transform: translateY(-50%);
 -webkit-transform: translateY(-50%);
 -o-transform: translateY(-50%);
 transform: translateY(-50%);
 left: 50%;
 margin-left: -500px;
 }
 #nubia{
 position: absolute;
 z-index: 1;
 stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
 animation: describe 4s forwards;
  -webkit-animation: describe 4s forwards;
 top: 50%;
 -ms-transform: translateY(-50%);
 -webkit-transform: translateY(-50%);
 -o-transform: translateY(-50%);
 transform: translateY(-50%);
 left: 50%;
 margin-left: -500px;
 }
 @keyframes fadeIn{
 from{opacity: 0;}
 80%{opacity: 0.5;}
 to{opacity:1;}
 }
 @-webkit-keyframes fadeIn{
 from{opacity: 0;}
 80%{opacity: 0.5;}
 to{opacity:1;}
 }
 @keyframes describe{
 from{
  stroke-dashoffset: 2000;
  opacity: 1;
 }
 to{
  stroke-dashoffset: 0;
  opacity: 0;
 }
 }
 @-webkit-keyframes describe{
 from{
  stroke-dashoffset: 2000;
  opacity: 1;
 }
 to{
  stroke-dashoffset: 0;
  opacity: 0;
 }
 }
 </style>
</head>
<body style="background:#000;">
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<g display="none">
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