vue3原生实现图片对比

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<template>
 <div class="picture-compare" @mousemove="onMouseMove" @mouseup="onMouseUp">
    <div ref="img" class="img img1">
      <img :src="props.img1" alt="" class="pic">
    </div>
    <div class="slide" ref="line" :style="{left: lineLeft - lineWidth / 2 + 'px'}" @mousedown="onMouseDown">
      <div class="line"></div>
    </div>
    <div class="slide-box" ref="slide" :style="{width: slideWidth + 'px'}">
      <div class="img img2" :style="{width: fullWidth + 'px' }">
        <img :src="props.img2"  alt="" class="pic">
      </div>
    </div>
 </div>
</template>

<script lang="ts" setup>
/**
 - 传入两张图片img1和img2即可，须传base64 或 绝对路径
 */

import { ref, onMounted} from 'vue'

const props = defineProps({
 img1: {
    type: String,
    required: true
 },
 img2: {
    type: String,
    required: true
 }
})

const img = ref<any>(null)
const slide = ref<any>(null)
const line = ref<any>(null)
const fullWidth = ref(0)
const slideWidth = ref(0)
const lineWidth = ref(0)
const lineLeft = ref(0)

const mouseStatus = ref(0) // 1 按下 0 未按下
const px = ref(0)

onMounted(() => {
 fullWidth.value = img.value?.offsetWidth
 slideWidth.value = fullWidth.value / 2
 lineWidth.value = line.value?.offsetWidth
 lineLeft.value = fullWidth.value / 2
})

function onMouseDown () {
 mouseStatus.value = 1
}

function onMouseMove (e:MouseEvent) {
 if (mouseStatus.value === 1) {
    const dx = e.pageX - (px.value || e.pageX)
    let newWidth = slideWidth.value - dx
    let newLeft = lineLeft.value + dx
    if (newWidth < 0) newWidth = 0
    if (newLeft > fullWidth.value + lineWidth.value) newLeft =  fullWidth.value + lineWidth.value
    slideWidth.value = newWidth
    lineLeft.value = newLeft
    px.value = e.pageX
 }
}

function onMouseUp () {
 mouseStatus.value = 0
}
</script>

<style lang="scss" scoped>
 .picture-compare {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;

    img {
      user-select: none;
    }
    .img {
      position: absolute;
      z-index: 1;
      right: 0;
      top: 0;
      width: 100%;
      height: 100%;
    }

    .slide-box {
      position: absolute;
      right: 0;
      z-index: 11;
      height: 100%;
      overflow: hidden;
    }
    .slide {
      position: absolute;
      top: 0;
      z-index: 22;
      height: 100%;
      width: 15px;
      cursor: col-resize;

      &::before {
        content: '';
        position: absolute;
        left: -8px;
        top: 50%;
        width: 0;
        height: 0;
        background-color: transparent;
        border-width: 10px 10px 10px 0;
        border-style: solid;
        border-color: transparent #fff transparent transparent ;
      }

      &::after {
        content: '';
        position: absolute;
        right: -7px;
        top: 50%;
        width: 0;
        height: 0;
        background-color: transparent;
        border-width: 10px 0 10px 10px;
        border-style: solid;
        border-color: transparent transparent transparent #fff;
      }


      .line {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        top: 0;
        width: 2px;
        height: 100%;
        background-color: #fff;
        color: red;
      }
    }

 }


</style>

<style lang="scss">
.el-select__popper {
 background-color: rgba(22, 39, 64, 0.7) !important;
 border-color: rgb(26, 66, 133) !important;

 .el-select-dropdown__item {
    color: #eee;
 }

 .el-select-dropdown__item.hover,
 .el-select-dropdown__item:hover {
    background-color: rgb(26, 66, 133) !important;
 }

 .el-select-dropdown__item.selected {
    font-weight: 1000;
    color: #fff;
 }
}

.el-popper.is-light .el-popper__arrow::before {
 border: 1px solid rgb(26, 66, 133) !important;
 background: rgba(22, 39, 64, 0.7) !important;
 border-right: none !important;
 border-bottom: none !important;
}
</style>