vue 流光边框矩形圆形容器

实现流光边框一般是用渐变背景加动画实现，然后使用内部盒子遮挡内部空间，达到边框流光的效果

思路：背景渐变+旋转动画

功能：

• 自定义渐变（是否渐变<不渐变没有流光效果>，渐变颜色，渐变角度，渐变宽度）
• 自定义动画时间

1 基础实现

<template>
  <Box> 测试 </Box>
</template>
<script setup lang="ts">
import Box from "./Box.vue";
</script>
<style scoped></style>

<template>
  <div class="box">
    <div class="content">
      <slot></slot>
    </div>
  </div>
</template>
<script setup lang="ts"></script>
<style scoped lang="scss">
.box {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  width: 100%;
  height: 100%;
  padding: 5px;
  border-radius: 10px;
  overflow: hidden;
  &:before {
    content: "";
    background-image: linear-gradient(120deg, #5ddcff, #3c67e3 40%, #4e00c2);
    position: absolute;
    z-index: 0;
    padding-left: 130%;
    padding-bottom: 130%;
    animation: rotate 8s linear infinite;
  }

  .content {
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    padding: 24px 20px;
    background: #f1d674;
    z-index: 2;
    border-radius: 6px;
  }
}
@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>

动图（略）

2 封装组件

2.1 圆形边框

使用mask属性，使得中间部分背景不被遮挡

<template>
  <div class="box" :style="{ width: width + 'px', height: height + 'px' }">
    <slot></slot>
  </div>
</template>
<script setup lang="ts">
const props = defineProps({
  width: {
    type: Number, //容器宽
    default: 100,
  },
  height: {
    type: Number, //容器高
    default: 100,
  },
  colors: {
    //颜色数组
    type: Array,
    default: () => [
      {
        color: "#64dcfd",
        width: 0,
      },
      {
        color: "#406cf1",
        width: 100,
      },
      {
        color: "#4501ac",
        width: 101,
      },
    ],
  },
  angle: {
    //渐变角度
    type: Number,
    default: 120,
  },
  borderWidth: {
    //流光边框宽度
    type: Number,
    default: 10,
  },
  gradient: {
    //是否渐变
    type: Boolean,
    default: true,
  },
  duration: {
    //动画时间
    type: String,
    default: "5s",
  },
});

const background = computed(() => {
  const positions = [];
  const colorsCopy = JSON.parse(JSON.stringify(props.colors));

  colorsCopy.forEach((s, index) => {
    const sum = colorsCopy.slice(0, index).reduce((a, b) => a + b.width, 0);
    if (!props.gradient) {
      positions.push(sum);
    }
    positions.push(sum + s.width);
  });
  return `linear-gradient(
       ${props.angle}deg, ${colorsCopy
    .map((s, index) => {
      if (!props.gradient) {
        return `${s.color} ${positions[index]}px, ${s.color} ${
          positions[2 * index + 1]
        }px`;
      }
      return `${s.color} ${positions[index]}px`;
    })
    .join(",")})`;
});

const borderLR = computed(() => {
  return props.width / 2 - props.borderWidth + "px";
});
const borderLRShink = computed(() => {
  return props.width / 2 - props.borderWidth - 1 + "px";
});
</script>
<style scoped lang="scss">
.box {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  overflow: hidden;
  &:before {
    content: "";
    background-image: v-bind(background);
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    animation: rotate v-bind(duration) linear infinite;
    mask: radial-gradient(
      transparent,
      transparent v-bind(borderLRShink),
      #000 v-bind(borderLR)
    );
    -webkit-mask: radial-gradient(
      transparent,
      transparent v-bind(borderLRShink),
      #000 v-bind(borderLR)
    );
  }
}
@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>

???????

2.2 矩形边框

使用伪元素，自定义中间部分背景

<template>
  <div class="box" :style="{ width: width + 'px', height: height + 'px' }">
    <slot></slot>
  </div>
</template>
<script setup lang="ts">
const props = defineProps({
  width: {
    type: Number, //容器宽
    default: 100,
  },
  height: {
    type: Number, //容器高
    default: 100,
  },
  colors: {
    //颜色数组
    type: Array,
    default: () => [
      {
        color: "#64dcfd",
        width: 0,
      },
      {
        color: "#406cf1",
        width: 100,
      },
      {
        color: "#4501ac",
        width: 101,
      },
    ],
  },
  angle: {
    //渐变角度
    type: Number,
    default: 120,
  },
  borderWidth: {
    //左右流光边框宽度
    type: [Array, Number],
    default: [20, 5],
  },
  gradient: {
    //是否渐变
    type: Boolean,
    default: true,
  },
  duration: {
    //动画时间
    type: String,
    default: "5s",
  },
  innerBackground: {
    //内部背景
    type: String,
    default: "#FFF",
  },
});

const background = computed(() => {
  const positions = [];
  const colorsCopy = JSON.parse(JSON.stringify(props.colors));

  colorsCopy.forEach((s, index) => {
    const sum = colorsCopy.slice(0, index).reduce((a, b) => a + b.width, 0);
    if (!props.gradient) {
      positions.push(sum);
    }
    positions.push(sum + s.width);
  });
  return `linear-gradient(
       ${props.angle}deg, ${colorsCopy
    .map((s, index) => {
      if (!props.gradient) {
        return `${s.color} ${positions[index]}px, ${s.color} ${
          positions[2 * index + 1]
        }px`;
      }
      return `${s.color} ${positions[index]}px`;
    })
    .join(",")})`;
});

const innerWidth = computed(() => {
  let doubleBorderWidth = 0;
  if (Array.isArray(props.borderWidth)) {
    if (props.borderWidth.length === 2) {
      doubleBorderWidth = props.borderWidth[1] * 2;
    } else if (props.borderWidth.length === 1) {
      doubleBorderWidth = props.borderWidth[0] * 2;
    }
  } else {
    doubleBorderWidth = props.borderWidth * 2;
  }
  return props.width - doubleBorderWidth + "px";
});
const innerheight = computed(() => {
  let doubleBorderWidth = 0;
  if (Array.isArray(props.borderWidth)) {
    if (props.borderWidth.length === 2) {
      doubleBorderWidth = props.borderWidth[0] * 2;
    } else if (props.borderWidth.length === 1) {
      doubleBorderWidth = props.borderWidth[0] * 2;
    }
  } else {
    doubleBorderWidth = props.borderWidth * 2;
  }
  return props.height - doubleBorderWidth + "px";
});
const colorSize = computed(() => {
  return (
    Math.ceil(
      Math.sqrt(props.width * props.width + props.height * props.height)
    ) + "px"
  );
});
</script>
<style scoped lang="scss">
.box {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  &:before {
    content: "";
    background-image: v-bind(background);
    position: absolute;
    width: v-bind(colorSize);
    height: v-bind(colorSize);
    animation: rotate v-bind(duration) linear infinite;
  }
  &:after {
    content: "";
    background: v-bind(innerBackground);
    position: absolute;
    z-index: 1;
    width: v-bind(innerWidth);
    height: v-bind(innerheight);
  }
}
@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>