签名SVG路径动画

stroke-dasharray

stroke-dasharray是一个表示属性，它定义了用于绘制形状轮廓的破折号和间隙的属性。它可以用作CSS属性并应用于任何元素，但它只对十二个元素有效

<style>
  @keyframes logo-anim {
    0% {
      stroke-dashoffset: 1px;
      stroke-dasharray: 0 3000%;
      opacity: 0;
    }

    10% {
      opacity: 1;
    }

    35% {
      stroke-dasharray: 3000% 0;
      fill: transparent;
    }

    /* Moving back */
    50% {
      stroke-dasharray: 3000% 0;
      fill: #000;
    }

    55% {
      fill: transparent;
    }

    95%,
    100% {
      stroke-dasharray: 0 3000%;
    }
  }
  #logo-anim, 
  #logo-anim path{
    fill: transparent;
    transition: all 0.4s ease-in-out;
    stroke-dashoffset: 1px;
    stroke-dasharray: 3000% 0;
    animation: logo-anim 10s ease forwards infinite;
    transform-origin: center;
    stroke: #000;
    animation-delay: 0s;
  }
</style>
<svg id="logo-anim"  stroke-linecap="round" stroke-linejoin="round" stroke-width="1em"
  height="117.000000pt" viewBox="0 0 509.000000 117.000000" preserveAspectRatio="xMidYMid meet"
  xmlns="http://www.w3.org/3000/svg" width="100" height="100" fill="none" viewBox="0 0 100 100">
  <g transform="translate(0.000000,117.000000) scale(0.100000,-0.100000)">
    <path stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="1em" d="M368 1153 c-26 -31 -37 -56 -139 -351 -192 -556 -242 -745 -207 -780
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468 98 l90 60 7 -44 c10 -67 37 -106 93 -134 45 -23 61 -25 170 -24 176 0 347
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51 45 94 78 98 75 3 -4 6 -15 6 -27 0 -32 39 -103 66 -121 65 -42 183 -2 377
129 l99 66 72 0 c40 0 98 5 130 11 32 6 59 9 61 7 1 -2 -2 -31 -8 -64 -10 -56
-8 -65 14 -110 19 -39 34 -54 74 -74 45 -23 62 -25 170 -25 105 1 138 5 265
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-5 45 -17 52 -14 7 -36 -9 -117 -86 -112 -107 -220 -188 -239 -180 -19 7 -54
120 -69 222 -17 117 -22 119 -146 61 -309 -143 -677 -261 -887 -284 -97 -11
-189 0 -224 26 -40 30 -41 101 -1 176 16 32 30 71 30 87 0 25 -4 29 -29 29
-22 0 -50 -18 -111 -70 -113 -98 -194 -154 -286 -197 -68 -33 -89 -38 -149
-38 -54 0 -76 5 -97 20 -38 27 -76 108 -84 177 l-7 57 104 97 c141 132 364
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-648 -588 -9 -8 -20 -12 -23 -9 -13 14 97 347 258 776 79 211 90 246 80 267
-14 29 -33 32 -54 8z" />
    <path stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="1em" d="M1770 790 c-14 -4 -114 -8 -222 -9 -164 -1 -199 -4 -212 -17 -33 -32
-6 -74 47 -74 18 0 68 4 112 10 44 5 133 14 197 19 131 11 161 21 156 54 -3
24 -35 31 -78 17z" />
    <path stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="1em" d="M4310 790 c-14 -4 -114 -8 -222 -9 -164 -1 -199 -4 -212 -17 -33 -32
-6 -74 47 -74 18 0 68 4 112 10 44 5 133 14 197 19 131 11 161 21 156 54 -3
24 -35 31 -78 17z" />
  </g>
</svg>

效果