1、HTML

  <view class="title">哈哈哈哈哈</view>

2、CSS

      animation: hue 6s infinite linear;
      background-image: linear-gradient(135deg, #fc00c7 0%, #1c4efd 54%, #00aded 100%);
      -webkit-text-fill-color: transparent;
      color: transparent;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;


@keyframes hue {
from {background-position:0 0;  }
to {background-position: 2000px 0;} }

效果：