svg动画之动态描边效果

<svg class="move_line1" xmlns="http://www.w3.org/2000/svg" width="600px" height="150px">
 <path d="M62.9 14.9c-25-7.74-56.6 4.8-60.4 24.3-3.73 19.6 21.6 35 39.6 37.6 42.8 6.2 72.9-53.4 116-58.9 65-18.2 191
 101 215 28.8 5-16.7-7-49.1-34-44-34 11.5-31 46.5-14 69.3 9.38 12.6 24.2 20.6 39.8 22.9 91.4 9.05 102-98.9 176-86.7
 18.8 3.81 33 17.3 36.7 34.6 2.01 10.2.124 21.1-5.18 30.1" stroke="#000" stroke-width="4" fill="none">
 </path>
 </svg>
 <script>
 //svg 动画一般用transtion和animation
 var path2 = document.querySelector(".move_line1 path");
 var length2 = path2.getTotalLength();
 //清除动作
 path2.style.transtion = path2.style.WebkitTransition = "none";
 //设置起点
 path2.style.strokeDasharray = length2 + ' ' + length2;
 path2.style.strokeDashoffset = length2;
 //获取一个区域，获取相关的样式，让浏览器寻找一个起始点
 path2.getBoundingClientRect();
 //定义动作
 path2.style.transition = path2.style.WebkitTransition = 'stroke-dashoffset 2s ease-in-out';
 //GO
 path2.style.strokeDashoffset = '0';
 </script>

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 </svg>
 </div>
 <script>
 (function() {
 function toArray(arr) {
 return Array.prototype.slice.call(arr);
 }
 var svg2 = document.querySelector('.move_line2 svg');
 svg2.parentNode.style.display = 'block';
 svg2.style.visibility = 'hidden';
 function fullSketch() {
 svg2.style.visibility = '';
 var paths = toArray(svg2.children);
 var begin = 0;
 var durations = paths.map(function(path3) {
  var length;
  console.log(path3.tagName);
  if(path3.tagName == "path"){
  length = path3.getTotalLength();
  }else if(path3.tagName == "ellipse"){
  length = Math.PI*path3.getAttribute("rx")*path3.getAttribute("ry");
  }else if(path3.tagName == "circle"){
  length = 2*Math.PI*path3.getAttribute("r");
  }else if(path3.tagName == "line"){
  var x_1=path3.getAttribute("x1"),y_1=path3.getAttribute("y1"),x_2=path3.getAttribute("x2"),y_2=path3.getAttribute("y2");
  length = Math.sqrt(Math.pow((x_1-x_2),2) + Math.pow((y_1-y_2),2));
  }
  path3.style.strokeDasharray = length + ' ' + length;
  path3.style.strokeDashoffset = length;
  return Math.pow(length, 0.5) * 0.02;
 });
 paths[0].getBoundingClientRect();
 paths.forEach(function(path, i) {
  path.style.transition = path.style.WebkitTransition = 'stroke-dashoffset ' + durations[i] + 's ' + begin + 's ease-in-out';
  path.style.strokeDashoffset = '0';
  path.setAttribute("class", "shade");
  begin += durations[i] + 0.1;
 });
 }
 window.addEventListener('load', fullSketch);
 }());
 </script>