html5 - How does FileReader read multiple files at once?

Question

<input type="file" name="sendfile" id="sendfile" v-show='false' accept="image/png,image/gif,image/jpeg" @change='upload' multiple>

As above, for an input that supports multiple image uploads, how to use filereader to locally read the dataurl of each image? How to write this upload?

Answer 1

Loop reading

new Vue({
  el: 'app',
  methods: {
    async upload () {
      const files = event.target.files
      const uploadList = []
      console.log(files)

      const readFileAsync = file => new Promise(resolve => {
        const reader = new FileReader()
        reader.onload = evt => resolve(evt.target.result)
        reader.readAsDataURL(file)
      })

      for (let i = 0; i < files.length; i++) {
        uploadList.push(await readFileAsync(files[i]))
      }

      event.target.value = null

      console.log(uploadList)
    }
  }
})