我需要一段vue3的分片断点续传的代码

非常高兴为您提供代码支持，以下是一段使用vue3实现分片断点续传的示例代码：

<template>
  <div>
    <input type="file" @change="onSelectFile">
    <div class="progress">
      <div class="progress-bar" :style="{ width: uploadProgress + '%' }"></div>
    </div>
    <button @click="uploadFile">上传文件</button>
  </div>
</template>

<script>
import axios from 'axios'

export default {
  data() {
    return {
      file: null,
      uploadProgress: 0,
    }
  },
  methods: {
    onSelectFile(event) {
      this.file = event.target.files[0]
    },
    async uploadFile() {
      if (!this.file) return

      const chunkSize = 1024 * 1024 // 1MB
      const totalChunks = Math.ceil(this.file.size / chunkSize)
      let chunksUploaded = 0

      for (let i = 0; i < totalChunks; i++) {
        const start = i * chunkSize
        const end = Math.min(start + chunkSize, this.file.size)
        const chunk = this.file.slice(start, end)

        const response = await axios.post('/uploadChunk', {
          chunk,
          chunkNumber: i + 1,
          totalChunks,
          filename: this.file.name,
        })

        this.uploadProgress = ((++chunksUploaded / totalChunks) * 100).toFixed(1)
      }

      await axios.post('/combineChunks', {
        filename: this.file.name,
      })

      alert('文件上传成功')
    },
  },
}
</script>

请确保您已经安装了axios和express等必要的依赖，并在后端实现了/uploadChunk和/combineChunks API以进行实际的文件上传和合并操作。如果您对代码有任何疑问，请随时联系我。